300 MAINE AGRICULTURAL EXPLRIMKNT STATION. lyll. 



segments and the hypopygium (pi. 7- fig- i^' Genera Insecto- 

 rum, Fasc. 93) fuscous or black. Terminal appendage of 

 lateral sclerite (Fig. 108). Legs including coxse reddish yel- 

 low; tarsi largely infuscated ; fore metatarsus over 1-2 as long 

 as the tibia Wings hyaline, anterior veins dusky; venation as 

 shown (Fig. 218). "D. C.;" "N. J.;" (C.W.J.) ; ''Mo.'' 

 imufor, Adams); Kas. (J.M.A.) ; Wis.; Mich.; Ithaca, N. Y. 



2. Docosia obscura Coquillett. 

 Proc. U. S. Nat. Museum XXIII. 597. 1901- 

 ]Male. Length 3-3.5 mm. Black, the halteres and legs yellow, 

 bases of cox^e, femora on base of under side, and the tarsi 

 brown; third joint of antennse only slightly longer than broad; 

 body polished, the hairs yellow; bristles of hind tibiae shorter 

 than greatest diameter of the tibia? ; wings hyaline, veins brown- 

 ish, subcosta ends in R., R-M crossvein at least 4 times as 

 long as the base of the radial sector, media and cubitus fork 

 opposite the base of the radial sector, anal vein almost reaching 

 the fork of the cubitus. "White Mts., N. H." (Coq.). A 

 defective s])ecimen from Muir Woods. California, collected by 

 Dr. J. C. Bradley probably also belongs here. 



3. Docosia nigclla n. sp. 

 Male. Length 4 mm. Black, the halteres, palpi, third an- 

 tennal joint, and legs yellow, bases of the coxs. under side and 

 apices of the femora, and the tarsi brown; third antennal joint 

 twice, the following joints about 3 times as long as broad ; body 

 polished, the hairs pale; bristles of hind tibise not longer than 

 greatest diameter of tibia. One claw of each fore foot sickle 

 shaped, with tooth proximad of the bend, the other claw smaller 

 and with t-.vo teeth: fifth tarsal joint of fore foot enlarged. 

 Wings hyaline, veins brownish, venation as figured (Fig. 219). 

 Hypopygium (Fig. 109). Differs from D. obscura mainly in 

 wing venrtion. Head of Tsirku River. Alaska, July-August. 

 (Prof. (). M. Leland). 



4. Docosia nitida n. sp. 

 Male and female. Length 2 mm. Black ; the halteres and 

 tibial spurs pale yellow, the fore femora, fore tibiae and knees 

 sometimes, brownish vellow ; the tarsi and the other legs dark 



