The First Recent Species of Protomutilla (Hymenoptera: Mutillidae: Myrmosinae.
Psyche 81:268-271, 1974.
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THE FIRST RECENT SPECIES OF PROTOMUTILLA (HYMENOPTERA: MUTILLIDAE; MYRM0SINAE)l
During a recently completed study of the higher classification of the aculeate Hymenoptera (Brothers, 1974), my attention was drawn to a female specimen from India representing a species of Myrmo- sinae (considered a subfamily of Tiphiidae by many authors, e.g., Krombein, 1940) but showing marked similarities to Nanomutllla (a member of the Mutillidae often included in the Myrmillinae). This situation is reminiscent of that found by Bischoff (1915) for seven female specimens in Baltic amber. All of these have the well- developed pro-mesonotal suture characteristic of the Myrmosinae, but in addition "die Tiere weisen Beziehungen zu verschiedensten Gattungen auf, so zu Myrmilla, Nanomutilla, Mutilla s. str. etc." Bischoff described the genus Protomutilla to include these seven species, and considered it best placed in the "Mutillinae", although intermediate between this taxon and the "Myrmosinae" (which he considered to be a member of the Mutillidae). He listed the most characteristic features of the genus as: the distinctly developed pro- mesonotal suture, the transverse first abdominal (metasomal) seg- ment, the lack of a pygidial area, the usually longitudinally striate sculpturing of the mesonotal region, and the absence of long pubes- cence. In addition, all of his specimens have the posterolateral angles of the mesosoma acute or dentate. The Indian specimen possesses all these characters except for that of the mesonotal sculpturing (absent in some of Bischoff's species also). The form of the postero- lateral angles of the propodeum differentiates this genus from the others with. a well-developed pro-mesonotal suture, so that the Indian specimen seems best considered to represent a modern species of Protomut'llla. Placement of this genus in the Myrmosinae is sup- ported by the almost straight and well-differentiated hind margin of the pronotum and also by the presence of a well-developed carina dorsally on the hind coxa (a character not mentioned by Bischoff), although this is not as markedly lamellate as in most other myrmosines. 'Contribution number 1538 from the Department of Entomology, University of Kansas, Lawrence, Kansas 66045.
'Present address: Department of Entomology, University of Natal, Pie- termaritzburg, South Africa.
Manuscript received by the editor January 21, 1974.
19741 Brothers - Proto?nutiZZa
Figs. 1-2. Protomutilla microsoma, sp. nov., 9. 1, dorsal view, legs omitted; 2, head, lateral view, antenna and palpi omitted. Fig. 3. Nano- mutilla microsoma Andre,
9, dorsal view, legs omitted. Scale = 1.0 mm.
Protomutilla microsoma sp. nov.
FEMALE: Length 2.6 mm. Body finely and evenly punctate with sparse, short, pale pubescence ; black except clypeus, antennal tubercle, antenna, mandible, ventral third of pronotum laterally, legs, fifth and sixth metasomal segments and apical margins of other metasomal segments testaceous, and palpi stramineous. Head almost prognathous, 1.1 times as wide and 0.7 times as high as long, 1.1 times as wide as mesomoma; sides weakly converging behind eye, about 0.3 times length of eye; ocelli absent; eye broadly oval, with many short setae; frons evenly swollen, produced between barely differentiated antennal tubercles; malar space 0.4 times as long as eye; weak genal carina present; clypeus flattened, anteriorly produced with strongly convex apical margin; antenna with scape 3.0 times as long as wide, pedicel about as long as first flagellar segment which equals second in length, flagellum widest at third segment; mandible approximately parallel- sided, obliquely tridentate, the apical tooth strongest. Mesosoma 1.4 times as long (excluding anterior collar) as wide; width at humeral angle 0.9 times that at propodeal angle. Pronotum (ex- cluding collar) 0.3 times as long as wide; hind margin shallowly concave ; lateral margins slightly convergent posteriorly ; humeral angle pronounced. Mesonotum approximately parallel sided, 0.9 times as wide as pronotum. Propodeum with lateral margins divergent posteriorly, forming a strong dentiform angle on each side; disc and declivity barely differentiated. Mesosomal pleura differentiated from nota by a longitudinal carina; concave except convex posteriorly forming propodeal angle. Legs unmodified ; foretarsus without spines (i.e., pecten undeveloped) ; hind coxa with obtuse larnellate tooth dorsally; hind tibia without spines externally, only a very few minute spines apically. Metasoma about 1.7 times as long as wide, 1.25 times as wide as mesosoma; first tergum 0.4 times as long as wide, about as wide as and 0.4 times as long as second; sixth tergum sparsely punctate, without differentiated pygidial area; first sternum with single blunt anteriorly-directed midventral tooth. MALE : Unknown.
HOLOTYPE: 9, [India, Orissa Prov.], Nilgiri Hills, 3500 ft. (H. L. Andrewes) ; in Hope Department, University Museum, Oxford, England. (No date of collection given.) The specimen is unfortunately damaged, and lacks the apical three segmentwf the left foretarsus, the left mid- and hind and right mid-tibi'ixnd tarsi; the left antenna is glued to the card bearing the "minutcn"
19741 Brothers - Protonzutiiia 271
Since the specimen has been remounted from a glued card mount, some features of the venter and appendages remain somewhat obscured by glue.
Although Bischoff's ( I 91 5 ) descriptions are very short, P. micro- soma seems clearly to differ from all the amber species. It may be most similar to P. nana, but the head undoubtedly differs in form from that species.
The resemblance of P. microsoma to NanomutiZZa (Fig. 3) is
quite remarkable, the most basic difference being the form of the pro-mesonotal suture. In addition to gross body form, these species have highly similar coloration and puncturation, and all are rather small in size. Nanomutilla even has a weakly developed carina on the hind coxa as well as pubescent eyes, characters lacking in the higher Mutillidae. These marked similarities tend to support my conclusions (elaborated in Brothers, 1974) that the AIyrmosinae should be considered a subfamily of Mutillidae. I should like to thank Mr. Christopher O'Toole of Oxford for bringing this specimen to my attention, and also Mr. W. L. Overal of
the Univesit? of Kansas for his help with preparation of the manuscript.
1915. Bernsteinhymenopteren. Schrift. Phys.-Oekon. Geb., Konigsberg 56: 139-144.
BROTHERS, D. J.
1974. Phylogeny and classification of the aculeate Hymenoptera, with special reference to Mutillidae. Univ. Kansas Sci. Bull. (sub- mitted).
KROMBEIN, K. V.
1940. Studies in the Tiphiidae (Hymenoptera Aculeata). IV. A re- vision of the Myrmosinae of the New World with a discussion a of the Old World species. Trans. American Ent. Soc. 65: 415- 465, pi. 24.
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