1914.] NATURAL SCIENCES OF PHILADELPHIA. 585 



the very similar microcellula) ; basal clefloction of Cui just before the 

 fork of M, cell 1st Mi small, the outer deflection of M 3 and cross-vein 

 m subequal. 



Abdomen brownish yellow, sternites yellow. Hypopygium with 

 the pleurites rather long, slender with rather abundant long pale 

 hairs, the dorsal appendage flattened (PL XXVI, figs. 19, 20), tri- 

 angular, the base narrowed, the tip truncate, chitinized along the 

 margin, at the apex finely denticulate; ventral appendage shorter^ 

 at the tip bearing a chitinized hook that is directed caudad and 

 outward; gonapophyses sharp-pointed, chitinized, decussate. 



Holotype, cT', Colorado. 



Allotype, 9 , Beulah, N. Mex., alt. 8,000 fef>t, August (T. D. A. 

 Cockerell). 



Differs from all of the described American species except E. 

 microcellula sp. n., in the small closed cell 1st M-i. From microcellula 

 it can be easily separated by the male genitalia. 



Erioptera (Erioptera) microcellula sp. n. 



Very similar to E. lucia in all general features, but the male genitalia 

 are conspicuously different. The pleurites are stouter and bear an 

 irregular appendage shaped as in the figures (Pi. XXVI, figs. 16, 17 

 and 18). The ventral pleural appendage is not shown in the drawings; 

 it consists of a cylindrical fieshy lobe, narrower at the base, very 

 densely covered with long pale hairs. The gonapophyses seen from 

 beneath are long chitinized hooks, slightly curved inward but their 

 tips not meeting, along the sides with numerous appressed teeth. 



The wing-venation is shown in PI. XXVI, fig. 14. 



Male, length, 4.8 mm.; wing, 6.8 mm. 



Holotype, cT, Colorado. 



Subgenus EMPEDA Osten Sacken. 



1869. Empeda Osten Sacken; Mon. Dipt. N. Am., vol. 4, p. 183. 

 Erioptera (Empeda) alicia sp. n. 



Body coloration light yellow without darker markings; cell 1st Mi 

 closed. 



Female, length, 3.5 mm.; wing, 4.9 mm. 



Rostrum light yellow, palpi brown. Antennae with the basal 

 segments light yellow, flagellar segments light brown. Head light 

 yellow. 



Thorax light yellow without darker markings, the pleurae of a 

 lighter shade than the dorsum. Halteres light brown. Legs, coxae 

 and trochanters yellow, femora brown, more yellowish at the base, 



