NU.12.S0. AEW NUliTH AMERICAN DIPTERA—COQVILLETT. 97 



SIMULIUM VIRGATUM, ne'w species. 



Male. — Hoad and body black, antenna' and month parts dark l)rown, 

 thorax gray pruinose, mesonotuui marked with a narrow median and 

 late rail}' with a ver}'^ broad velvet black vitta (viewed directlj' from 

 above), mosonotum sparsely covered with short, appressed hairs; 

 abdomen on tirst six segments opaque, velvet black, a large silvery 

 white spot on each side of the second and sixth segments, venter near 

 each side Avith an interrupted yellow vitta on segments three to seven, 

 composed of appressed hairs, on each side of base of abdomen is a large 

 cluster of j^ellow hairs, and a smaller cluster on each side of segments 

 three to five; femora and front tibiae yellow, their apices brown, middle 

 tibia3 broAVn, a yellow ring beyond the base, hind tibife brown, the 

 extreme base yellowish; tarsi black, broad base of first joint and 

 extreme base of the second on the middle and hind tarsi light yellow- 

 ish; wings hyaline, veins along the costa yellowish brown, the others 

 nearly hj-aline: halteres yellow. 



Foiiale. — Ditiers from the male as follows: Vitta; of mesonotum 

 brownish, the median vitta dilated posteriori}', wider than either of the 

 lateral ones; viewed from in front the mesonotum appears whitish 

 pruinose and with two velvet black vittge; abdomen on first five seg- 

 ments and sides of the sixth opaque, gray pruinose, and with a velvet 

 t)lack fascia at bases of three to six, broadly interrupted on six, the 

 middle of which and the portion of the abdomen beyond it is very 

 thinly pruinose and of a dark brown color. 



Length, nearl}^ 3 mm. Two males and two females collected August 

 4 to 1-i by Mr. H. S. Barber. 



JIalniat. — Las Vegas Hot Springs, New Mexico. 



%^6>.— Cat. No. 6183, U.S.N.M. 



SIMULIUM GLAUCUM, new species. 



Mah:. — Head and ))ody black, face gray pruinose, thorax bluish 

 gray pruinose, mesonotum marked with a narrow median and slightly 

 wider lateral black vitta^ broad lateral margins when viewed from 

 behind silvery white, a pair of large, subquadrate silvery spots on the 

 front end separated b}' the median black vitta, which is here greatly 

 dilated; abdomen velvet black, sides of segments two and five to nine 

 silvery, middle of dorsum of four also silvery; venter almost wholly 

 silvery; femora and tibia; brown, bases of tibia; yellow, iuitcrior side 

 of front ones largely silvery; tarsi black, broad base of first joint of 

 the middle and hind ones whitish; wings h^'aline, veins along the costa 

 yellowish brown, the others nearly hyaline; halteres yellow; length, 

 2.5 mm. A single specimen collected April 8, 1898,- b}^ Mr. C. F. 

 Adams. 



IldljJtat. — Kansas Citv, Missouri. 



Type— Qui. No. 6184*, U.S.N.M. 

 Proc. N. M. vol. XXV -02 1 



