SABETHINTJS TJNDOSUS 33 



The correct generic location of the above species is not guaranteed, as we have 

 not seen them all. The species included in our own region separate as follows : 



ADUIiTS, STBUCTtTEE AND COLOBATION. 



1. Anal setSB of the abdomen moderate, brownish; fifth joint of the hind tarsi 



white-marked beneath wndosus CoqulUett (p. 33) 



Anal setee of the abdomen long, black; hind tarsi black. 



identicus Dyar & Knab (p. 35) 



ADULTS, MALE GENITALIA. 



The structures are essentially as In Wyeomyia, and our two species will be found 

 Included In the table of that genus, page 55. 



LABV^. 



1. Hooks on the seventh abdominal segment simple. . . . wndosus Coquillett (p. 34) 

 Hooks on the seventh abdominal segment toothed, identicus Dyar & Knab (p. 36) 



SABETHINUS UNDOSUS (Coquillett). 



SabetJioides undosus Coquillett, Proc. Ent. Soc. Wash., vli, 186, 1906. 



Sabethoides undosiis Dyar & Knab, Journ. N. Y. Ent. Soc, xlv, 226, 1906. 



Sabethoides undosus Dyar, Proc. Ent. Soc. Wash., vili, 20, 1906. 



Sabethoides undosus Coquillett, U. S. Dept. Agr., Bur. Ent., Tech. Ser. 11, 27, 1906. 



Sabethes undosus Dyar & Knab, Journ. N. Y. Ent. Soc, xv, 208, 1907. 



Sabethes undosus Busck, Smiths. Misc. Colls., quart, iss.. Ill, 70, 1908. 



Sabethoides undosus Theobald, Mon. Cullc, v, 585, 1910. 



Original Descbiption op Sabethoides undosus: 



Near confusus, but the dorsum of the abdomen is not white-scaled in the front 

 angles of the segments. Scales of proboscis and palpi purple, those of the occiput 

 violet-purple, a large patch of white ones on each side. Mesonotum and scutellum 

 mixed metallic blue-, green-, and coppery-scaled, the humeri violet-scaled, the lower 

 portion whitish, scales of pleura white_ Abdomen purple-scaled, scales of venter 

 white or yellowish, the upper border wavy. Legs purple-scaled, the lower side of the 

 femora and inner side of the tibiae brassy-yellow-scaled; tarsal claws simple. Wings 

 hyaline, the scales brown. Length 3 mm. 



Trinidad, W. I. Ten specimens collected by Messrs. F. W. Urlch and A. Busck. 



Type: No. 8292, U. S. National Museum. 



Description of Female, Male, and Larva or Sabethinus undosus ; 



Female. — Proboscis moderate, slightly enlarged apically, vestiture black with 

 blue luster; labellse small, rounded, with fine outstanding setse. Palpi short, 

 one-fifth as long as proboscis, slender, black, a tuft of outstanding hairs at base. 

 Antennae moderate, the joints subequal, rugose, pilose, black; tori subspherical, 

 with a cup-shaped apical excavation, dark brown, whitish pruinose; hairs of 

 whorls long, moderately dense, black. Clypeus slender, elliptical, convex, dark 

 brown with a white pruinosity, nude. Eyes large, contiguous at vertex, produced 

 below nearly to clypeus, black. Occiput clothed with flat, shining, metallic 

 green, violet, and blue scales, two brown setse at vertex; cheeks silvery. 



Prothoracic lobes large, approximate dorsally, clothed with violet and blue 

 scales, bearing a dense row of coarse black bristles. Mesonotum blackish, clothed 

 with broad, flat, metallic-green and olivaceous iridescent scales. Scutellum tri- 

 lobate, densely covered with scales similar to those of the mesonotum, some with 

 reddish luster, each lobe with a small tuft of brown bristles. Postnotum ellip- 

 tical, prominent, dark brown, with a rounded median carina, a tuft of about ten 

 large bristles posteriorly; without scales. Pleurae dark brown, coxae luteous, 

 clothed with elliptical, flat, silvery-white scales. 



Abdomen subcylindrical, compressed, truncate at the tip, which bears a mod- 

 erate tuft of brown hairs; dorsal vestiture black with slight blue reflection; 

 venter silvery-white, the colors separated on the sides in a sharp, strongly undu- 

 lating line ; dorsum of first segment with submetallic blue-green vestiture and 

 at the sides with a silvery patch. 



