Two New Bembecids (Hymenoptera) from Channel Islands, California.
Psyche 30(1):6-8, 1923.
This article at Hindawi Publishing: https://doi.org/10.1155/1923/53716
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6 Psyche [~ebruary
TWO NEW BEMBECIDS (HYMENOPTERA) FROM THE CHANNEL ISLANDS, CALIFORNIA.
BY CHAS. L. Foy, San Fransico, Cal.
Bembix harnata sp. nov.
Male : Black; labrum, mandibles except apex, broad base and narrow lateral margins; clypeus; lower part of frons between antenna1 bases (angled dorsally); scape below; broad anterior orbits much shortened above; very narrow posterior orbits, ab- breviated above and much shortened below at lower fourthof eye from mandibles; fascia on the first tergite reduced to small sub- ovate lateral spots; narrow undulate fascia on tergites 2-6, usually narrowly interrupted medially, except that on 6 which is continuous and strongly notched on posterior border; small spot on each side apical area of ultimate tergite, sometimes wanting, lateral spots of sternites 2-5, sometimes very small ones on 6, an apical wedge shaped stripe on femora above, longer on anterior pair, tibise except black stripe on posterior surface and tarsi, all dull greenish yellow, the t>arsi having a rusty tinge. Seg- ments 7-9 of flagellum sub-spinose on posterior border; segments 9-11 bearing large open flat depressions, the ultimate segment a trifle longer than the preceding, only slightly curved, almost as broad at the roundedly truncate apex as at the base; inter- mediate femora below irregularly serrate-dentate; second ster- nite bearing a median hooked process distinctly higher than its basal length, much as in foxi, the sixth bearing a prominent ob- lique process narrowed and more produced posteriorly than in nubilipennis; this sternite also bearing a similar pair of rounded lateral processes or ridges; seventh sternite with a prominent median carina. . Inner margins of the eyes nearly parallel. Flagellum tinged with fulvous below. Wings hyaline, veins dark brown. Head, thorax, median segment, base of abdomen, coxse, trochanters and femora clothed with dense long pale pubescence, becoming longer and white beneath, the rest of the abdomen shorter-pubescent.
19231 Two New Bembecids from the Channel Islands 7 Genital stipites shaped much as in comata as shown by Parker (fig. 163) but the inner margin more arcuated before the apical notch, the hairs longer and confined to the inner half
of the surface and the basal suture oblique for its whole length, as in Parkers' figure 169.
Length 18-20 mm.
Both in the Handlirsch and Parker keys this species runs to nubilipennis from which it differs in the size and shape of the body (being very robust) and in the absence of maculation on the thorax, pattern of maculation on the tergites and ster- nites, color and maculation of the legs, spinose character of the segments of the flagellum, serrate dentations of the intermediate femora, the longer and more dense pale pubescence and the form of the male stipites. In general appearance this species some- what resembles amGna, principally on account of the robustness of the body and the pattern of maculation on the t'ergites, but from which it can readily be distinguished by the character of the processes on the second and sixth sternites, absence of macula- tion on the thorax, the much shorter apical spurs on the inter- mediate tibiae and the form of the
stipites. Like the related
species this shows some variation in the yellow marking; two specimens have small spots on the tegulse and one a larger spot at the inferior angle of the prothorax.
Described from twelve males taken by Mr. E. P. Van Duzee on San Miguel Island, Santa Barbara County, California, May 20,1919.
Holotype, male, No. 928, Mus. Calif. Acad. Sci. ; paratypes in the collection of the Academy and in t,hat of the author. Type locality; San Miguel Island, Calif. Bembix hamata subsp., lucida subsp. nov. Male: Black; labrum, mandibles except apex and very nar- roe base; clypeus, lower part of frons between antenna1 bases (angled dorsally) ; anterior orbits, much shortened above, nar- row posterior orbits slightly shortened above and below almost reaching base of mandibles; posterior edge of tubercles continued
8 Psyche [~ebruar~
in a narrow st,ripe down the sides of the prothorax; tegulse except apex; fascia on first tergite, very widely interrupted medially, shortened to large elongated lateral spots; fascise on tergites 2-5, continous and undulate on anterior border, deeply notched on posterior, that on sixth covering entire tergite except narrow posterior edge; large quadrate spot on apex of ultimate tergite, emarginate anteriorly;
lateral spots on sternites 2-6; femora
distally above and below; anterior tibiae except broad stripe below and narrow one above, intermediate and posterior except short stripe below, and tarsi, all greenish yellow. The markings of head and femora below are more of a greenish white (in the species yellow). The segments of the flagellum have the same characters and color as in the species; the intermediate femora are more strictly dentate than in the species. The second sternite bears a large median hooked process (not so high asin the species), and the sixth a shorter and more acute median process and less prominent lateral ridges; seventh wit'h a prominent median carina. The characters of the eyes and pubescence are the same as in the species.
This subspecies can readily be distinguished from the typical form of the species by the maculations on the head, thorax and abdomen and the general clearer color.
Described from one male taken by Mr. E. P. Van Duzee on Santa Cruz Island, Santa Barbara County, California, Ma,y 18, 1919.
Holotvpe, male, No. 929 Mus. Calif. Acad. Sci. Type locality; Santa Cruz Island, California.
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