360 Annals Entomological Society of America [Vol. V, 



2d Ri dark bro\vn; a brown cloud at the origin of Rs; veins broadly 

 margined with the dark-ground color leaving the centers of the cells 

 pale. Venation: Rs rather long, somewhat angulated basally; R2+3 

 about one-third longer than R2; cross-vein r connects R2 far bej'ond the 

 fork of R2+3; deflection of R4+5 and r-m about subequal; sides of the 

 elongate cell 1st M2 parallel, petiole of cell Mi short, only about one- 

 third as long as the cell; cross- vein m-cu indicated by a point. Cu2 

 one-half longer than the basal deflection of Cui. 



Abdomen: Tergum, brown, 2d segment deeply impressed in the 

 center, except at the median line; lateral margins of the sclerites \\ath a 

 basal yellow triangle ; stemites yellow, caudal margins darker, bro\\Tiish. 

 O\'ipositor: Segment 9 short, the valves slender, but flattened blade- 

 like; lower valves, short, very high, blade-like; nearly twice as high 

 as the tergal valves. 



Holotype, 9 , Piches and Perene Vs., Peru, 2000-3000 feet, 

 (Pres. by Soc. Geog. de Lima). 



Coll. U. S. Nat. Mus. (No. 15,074). 

 Microtipula, gen. n. 



Antennae elongated in the cf and apparently 12-segmented, the 

 flagellar segments very elongated, clothed with a long, pale pubescence; 

 two or three bristles at the base of each segment and, usually, one near 

 the middle. Anterior prolongation of the front short; nasus not dis- 

 tinct. AVings: Sc long extending beyond the origin of Rs to a distance 

 about equal to R2+3; Rs long, gently arcuated, not quite as long as R3; 

 cross-vein r at the fork. R2 indicated only basally, its lip atrophied. 

 Cross-vein r-m short, about as long as r; cross-vein m long, a little less 

 than the basal deflection of M1+2; cross-vein m-cu obliterated by the 

 touching of Cui and M3. Hypopygium complex, penis very long. 

 Type, M. amazonica, sp. n. 



This genus is proposed for a tiny species from Eastern 

 Brazil, which, by its combination of characters, will not fit 

 into any of the existing genera. In its venation (i. e. oblitera- 

 tion of the terminal section of R") the species suggests certain 

 Dolicliopezine genera. In my key to the Dolichopezini* it 

 would not fit in either of the primary sections; in the Megis- 

 tocera group because of its complex hypopygium or in the 

 Dolichopeza group because of its 12-segmented antennae. It 

 bears a slight resemblance to Mcgistomastix which has a very 

 different hypopygium and 13-segmented antennje. I prefer 

 to believe it to belong to the Tipiilini. In Skuse's keyf to the 

 Tipuline genera it would run down to Ilabromastix of Australia. 

 However, this genus as well as all the Tipulini known to me. 



•Psyche; Vol. 19, p. 64 (April, 1912). 



tDipt. Austral.; pt. 8; Tipul. longipalpi (Proc. Linn. Soc. .N. S. \V. 

 (2d series). Feb. 26, 1890; p. 78-81.) 



