350 



with one spine, tibiae with rather strong bristles; basal joint of hind 

 tarsi shorter than remaining joints together ; fifth joint without ven- 

 tral spines ; claws rather small, subequal, each with an inner median 

 tooth. Third vein to about three fourths the wing-length, first short 

 of middle of third ; cross vein distinctly before wing-middle and 

 sHghtly in front of fork of cubitus. 



Length, 3. mm. 



Type locality, Algonquin, 111., July 12, 1895 (^- A- Nason). Para- 

 type from Wallops Island, Va., May 25, 191 3 (W. L. McAtee). 



Should the spine on hind femora be overlooked or absent this 

 species will run down to media in the foregoing key, from which the 

 whitish abdomen readily separates it. 



15. Bezzia setulosa Loew 



Ceratopogon setulosus Loew, Berl. Ent. Zeitschr., 1861, p. 312, sp. 8. 



Bessia setulosa (Loew) Malloch, Jour. N. Y. Ent. Soc, Vol. 22, 1914, p. 282. 



Larva. — Length, 6-7 mm. White. Head brownish, eye spot du- 

 plicated, black ; dorsal surface with a few weak hairs. Mandibles with- 

 out distinct teeth, the apical half slender, curved, the basal half thick- 

 ened, the general shape similar to that of Palpoinyia longipcnnis; la- 

 bium produced anteriorly at center in the form of a rather sharp sim- 

 ple tooth. Abdomen as in louc/ipcnnis. 



Pupa. — Length, 3.5 mm. Brownish. Thoracic respiratory organ 

 about five times as long as wide, of almost the same width throughout, 

 the surface with a few inconspicuous hairs, trachea filling almost the 

 entire area, without decided convolutions; dorsum of thorax on the an- 

 terior half with minute granulations, and a group of five weak hairs on 

 each side at middle. First abdominal segment with about five weak 

 hairs on dorsum, the succeeding segments, viewed from the side, with 

 about twelve small tubercles, three of which, in a perpendicular row 

 beyond the middle, are the most distinct, each tubercle armed at the 

 apex with a hair. (Apical segment broken.) 



Imago; Male. — Black. Antennal plumes golden yellow. Thorax 

 covered with dense pruinescence, the disc of mesonotum with a brown 

 anterior divided median vitta which reaches beyond middle, and a lat- 

 eral streak of same color which reaches from posterior margin to mid- 

 dle ; scutellum yellow, often brownish. Abdomen yellowish white, the 

 apical 2-3 segments tinged with fuscous. Legs pale yellow, coxae 

 black, the bases of all femora, a ring before apices of fore femora, the 

 apical third of mid and hind femora, a ring beyond base of fore tibiae, 

 the basal third of mid and hind pairs, and narrow apices of all tibiae 

 and the apices of the tarsal joints black. Wings clear, veins yellow. 

 Halteres yellow. 



Eyes narrowly separated ; antenna nearly twice as long as head 

 and thorax together. Mesonotum with numerous discal hairs which 



