Key to the Species of Leptoglossus Guér. Occurring North of Mexico (Heteroptera: Coreidæ).
Psyche 24(3):69-73, 1917.
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19171 Won-Key to the Species of Leptoglosaw W. 69 KEY TO THE SPECIES OF LEPTOGLOSSUS GUER. OCCURRING NORTH OF MEXICO (HETEROPTERA;
BY EDMUND H. GIBSON,
Bureau of Entomology, Washington, D. C.
The cosmopolitan genus Leptoglossus Gubr. is represented in America, north of Mexico, by nine species all of which are listed in Van Duzee's recent check list. Specimens bearing labels of two other species, namely balteatus Linn. and stigma var. minor Dall. are in the collection of the U. S. National Museum, but I believe them to have been wrongly determined.
This genus belongs to the tribe Anisoscelini A. & S. and may be separated from Chondrocera Lap. and Narnia Stal, the other two genera of the tribe which are known to occur in North America, by the large dilations of the hind tibiae and simple antennae which have their basal joint long.
In working out the key to the species, color markings have been eliminated as far as possible. Specimens of each species have been examined and in practically each one access has been had to large series, which are in the collection of the U. S. National Museum. Leptoglossus Gu6r.
Leptoglossus Gubr., Voy. de la Coquille, Ins., p. 174, 1838. Anisoscelis Spin., Ess. Hem., p. 200, 1837. Theognis Stal, Stettiner, Ent. Zeit,g., xxiii, p. 294, 1862. Leptoglossus Gu6r. may be characterized as follows: Head elongate, horizontal.
Antennae rather stout but not swollen or dilated, basal joint long, about equal to length of the head; rostrum passing the metasternurn; bucculae short. Thorax longer than head, broad and rounding posteriorly. Elytra narrowing towards apex. Hind femora more or less swollen; hind tibiae with large dilations of foliations, the outer margins of which are usually more or less deeply scalloped. Spiracles at base and apex of abdomen about equally remote.
The haplotype of the genus is dilaticollis Gu6r. Pndit 24:Cf9.72 (1917). hup //psyche eincluh org/M/M-WI html
70 Psyche [June
Key to the species of Leptoglossus occurring north of Mexico. 1. Thorax coarsely punctate or rugose ....... .fulvicornis Westw. Thorax not rugose, only finely punctate .................. .2 2. Apex of head terminating in a stout spine. ... .clypealis Heid. ..........................
Apex of head without a spine.
3. Fourth joint of the antennae equal to or shorter than the third ............................................ joint. .4
Fourth joint of antennae longer than third joint. .......... .5 4. The outer expansion of the hind tibise reaching almost to apex ........................
of tibiae, lanceolate corculus Say
The outer expansion of the hind tibiae reaching but two thirds the length of tibiae, foliaceous ........... occidentalis Li eid. 5. Lateral-posterior margins of thorax more or less crenulate. ... .6 Lateral-posterior margins of thorax not crenulate, and with only a mere trace of a transverse color band or line on the ...................................
elytra oppositus Say
6. Posterior angle of thorax terminating in a prominent spine gonagra Fabr.
Posterior angles of thorax not terminating in a prominent spine .............................................. 7 7. Thorax bordered with bright orange and foliation of hind tibiae .................................
short. ashmeadi Heid
Thorax not bordered with orange.
Foliation of hind tibiae
large and long. .8
8. Scallops in the foliations of the hind tibiae deep and long. Pos-
terior femora prominently incrassated ....... zonatus Dall. Scallops in the foliation of hind tibiae shallow and usually short. Posterior femora swollen but not prominently incrassated phyllopus Linn.
Leptoglossus fulvicornis Westw.
Leptoglossus fulvicornis Westw., Hope Cat., 11, p. 17, 1842. Leptoglossus magnoliae Heid., Pro. Ent. Soc. Washington, xii, 1910, p. 191.
This is a large species and can be distinguished from all others by having the thorax coarsely punctate or rugose. Antennae and first two pairs of legs light in color. No bakd or markings on elytra.
Posterior angles of thorax broadly rounded and prom- inently raised.
19171 Gibson-Key to the Species of Leptoglossus Guh. 71 It ranges from Maryland southward through Florida and Ala- bama.
Leptoglossus clypealis Held.
Leptoglossus clypealis Heid., Pro. Ent. Soc. Washington, xii, p. 195, 1910.
The apex of the head terminating in a spine is the character which readily distinguishes this species from all others of the genus. This is a western species occurring from Nebraska to Oregon, south through California, Arizona and New Mexico. Leptoglossus corculus Say.
Anisoscelis corculus Say, Ent. of N. A., Vol. 1, p. 326, 1832. Theognis excellens Mayr, Verh. Zoo1.-bot. Ges. Wein., xv, p. 434, 1865.
Together with the following species corculus has the fourth joint of the antennae equal to or shorter than the third. This character may be used to separate these two species. Corculus differs markedly from occidentalis in having the dilation of the hind tibiae lanceolate and reaching nearly to the apex of the tibiae, while the dilation ,in occidentalis is foliaceous and much shorter. It is known to occur from New Jersey southward through Georgia, and west to Colorado.
Leptoglossus occidentalis Heid.
Leptoglossus occidentalis Heid., Pro. Ent .. Soc. Washington, xii, p. 196, 1910.
Following his description of the species Mr. Heidemann states: "This species has frequently been determined as L. corculus Say- but by close observation the differently shaped expansion of the hind tibiae will distinguish it at once." The expansion is shorter and foliaceous.
The known distribution is from Colorado west to the coast and from California north to Vancouver.
Leptoglossus oppositus Say.
Anisoscelis oppositus Say, Ent. of N. A., Vol. 1, p. 326, 1832. Anisoscelis tibialis H. S., Wanz. Ins., Vol. 7, p. 12, 1844. The distinguishing characters for this species are the smooth lateral-posterior margins of the thorax and the unmarked elytra.
72 Psyche [June
Only occasionally is there a faint transverse line on the elytra. The foliations of the hind tibiae are large with deep scallops. This is probably the most common species in the United States. It is primarily a southern species but is known to occur as far north as New Jersey.
Leptoglossus gonagra Fabr .
Cimex gonagra Fabr., Syst. Ent., p. 708, 1775. Cimex grallator Herbst., Gem. Naturg., vi, p. 239, 1784. Anisoscelis antica H. S., Wanz. Ins., iii, p. 92, 1835. Anisoscelis praecipua Walk., Cat. Hem. Het. British Mus., p. 128, iv, 1871.
This is a large species and easily recognizable by the broad thorax, the lateral-posterior angles of which terminate in a prominent spine, and also by the yellow transverse curved line on the anterior portion of the thorax.
It is strictly a southern species.
Leptoglossus ashmeadi Heid.
Leptoglossus ashmeadi Held.. Bul. Buffalo Soc. Nat. Sci., ix, p. 237, 1909.
Of the species occurring north of Mexico this is the most easily recognized one. The exceptionally short foliation of the hind tibiae and the bright orange coloration on the head and thorax make the identity unmistakable. Mr. Heidemann recorded it only from Florida.
Leptoglossus zonatus Dall.
Anisoscelis zonatus Dallas, List. Hem. Brit. Mus., ii, 1852. Closely related to phyllopus Linn. but from which it can be separated by having the scallops of the foliations of the hind tibiae deeper and longer.
A comparatively large species and recorded only from the south.
Leptoglossus phyllopus Linn.
Cimex phyllopus Linn., Syst. Nat., 1, 2, p. 731, 1767. Anisoscelis albicinctus Say, Ent. of N. A., Vol. 1, p. 326, 1832. Anisoscelis fraternus Westw., Hope Cat., ii, p. 16, 1842. Anisoscelis confusus Dallas, List Hem. British Mus., ii, p. 453, 1852.
With oppositus Say this is one of the twomost common species in the United States.
It can be distinguished, however, from
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