206 MOSQUITOES or NOETH AMERICA 



DEINOCERITES TROGLODYTUS Dyar & Knab. 

 Deinocerites troglodytus Dyar & Knab, Smiths. Misc. Colls., quart, iss., lii, 260, 1909. 

 Obiqinai. Desceiption of Deinocerites tboqlodttub: 



Closely allied to D. cancer Theobald and of the same size and coloration, but the 

 cerci of the female are sharply pointed and have a spine on the lower side, and are 

 not elongate conical as in D. cancer, or stoutly conical as in D. melanophylum D. 

 & K., while the antennae of the male are stout at the tip and uniform, the last joint 

 not disproportionately enlarged, not uniformly slender as in D. melanophylum, nor 

 with the last joint enlarged like a knob, as in D. cancer. 



Twenty specimens, Trinidad, British West Indies, June (A. Busck). 



Type no. 12128, V. S. N. M. 



DeSCBIPTION of FEMAI.E, lilAM;, AND LABVA OF DEINOCSmiTES TEOGLODYTUS: 



Female. — Proboscis rather long, scarcely thickened towards apex; labellae 

 rather large, conical ; setae rather long, dense, those on labellae more prominently 

 outstanding; vestiture of blackish-brown scales. Palpi short, about one-sixth 

 as long as proboscis, brown scaled with outstanding setae. Antennae long, fili- 

 form, very slender, coarsely ciUate, second joint about fourteen times as long 

 as wide; succeeding ones about six times as long as wide, subequal; tori sub- 

 spherical with a cup-shaped apical excavation, luteous brown, darker within; 

 hairs of whorls sparse, short, black. Clypeus elliptical, prominent, conical, light 

 brown, nude. Byes broadly contiguous above, black. Occiput dothed with 

 narrow, curved golden-brown scales, those on margins of eyes paler, broader and 

 denser ; numerous erect, forked brown ones forming a dense mass posteriorly ; a 

 row of bristles along margins of eyes. 



Prothoracic lobes elliptical, remote dorsally, clothed with black bristles. 

 Mesonotum clothed with small narrow-curved bronzy-brown scales; a pair of 

 bare submedian stripes, rather narrow and close together; setae abimdant, long, 

 coarse, arranged in broad subdorsal and marginal rows, longest posteriorly. 

 Scutellum trilobate, clothed with bronzy-brown scales, each lobe with a group of 

 coarse black setae. Postnotum rather narrow, elongate, with median carina, 

 brown, smooth. Pleurae and coxae luteous brown, with a vertical patch of bronzy- 

 brown scales on mesopleura and rows of rather coarse dark bristles. 



Abdomen subeylindrical, truncate at apex, the cerci large, subcorneal, 

 obliquely subtruncate at tips, each with a pair of flattened subterminal fila- 

 ments, one below the other, and a seta below beyond the middle, last segment of 

 abdomen tubercularly roughened apically on the lower surface, witii coarse 

 setae; vestiture above of duU-brown scales with bronzy and blue luster, beneath 

 dull yellowish, submetaUic; setae numerous, those on hind margins of the 

 segments coarser. 



Wings rather broad, hyaline; petiole of second marginal cell less than one-half 

 as long as its cell ; that of second posterior cell shorter than its cell ; basal cross- 

 vein distant rather more than its own length from anterior cross- vein ; scales of 

 veins ligulate, a few with subtruncate apices, densest and broadest on forks of 

 second vein; bronzy brown, with blue reflection along the costa. Halteres pale 

 with black knobs. 



Legs moderately long and slender, the middle femora slightly stouter than the 

 others ; vestiture of bronzy-brown scales, with a blue reflection in some lights ; 

 femora yellowish beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 3 mm. 



Male. — Proboscis moderately long and slender, with a suture beyond middle. 

 Antennae very long, exceeding the body in length ; second joint about eighteen 

 times as long as wide, third joint about ten times as long as wide, succeeding ones 

 progressively shorter, penultimate one about three times as long as wide, last 

 joint about the same, but slightiy stouter; hairs of whorls sparse, moderate, 

 smaller than in the female, obscured by the coarse ciliation. Palpi very short, 



