922 Charles Paul Alexander 



Erioccra is ono of the larger fj;enera of crano-flios, including about one 

 hundred described species which are most numerous in the tropics of 

 both hemispheres. The larvae are carnivorous. They live in streams, 

 and pupate in sand or gravel (Alexander and Lloyd, 1914). The habits 

 of the common local species E. longicomis have been described by the 

 author in another paper (Alexander, 1915 a: 149-152). The following key 

 divides the local species of Eriocera: 



1. Cell Ml present 2 



Cell Ml lacking 3 



2. Antennae of male greatly elongated, more than twice the length of the whole body; wings 



grayish brown; vertical tubercle prominent, brownish on the sides. [Arrhenica spinosa 

 0. S. Proc. Acad. Nat. Sci. Phila., p. 244, pi. 4, fig. 30. 1859.] (Plate XXXVII, 105.) 



E. spinosa (0. S.) 



Antennae short in both .sexes, extending about to the wing root or a little beyond; wings 



darker brown; vertical tubercle low, grayish. [Bui. U. S. Geol. Survey, vol. 3, p. 205. 



1877.] (Plate XXXVII, lOG.) E. hrachycera 0. S. 



3. Color of body yellow or yellowish red 4 



Color of body brown, gray, or black 5 



4. Antennae of male elongated, longer than the body; a blackish spot on the scutai lobes 



above the wing root. [Slow. Dipt. N. Amer., part 4, p. 255. 1869.] (Plate XXXVII, 



109.) E. wilsonii O. S. 



{E. aniennarin Doane [Journ. N. Y. Ent. Soc, vol. 8, p. 194, pi. 8, fig. 12, 1900] is 

 the same as E. wilsonii 0. S.) 

 Antennae short in both sexes; no blackish spot on the scutai lobes above the wing root. 

 [Journ. N. Y. Ent. Soc, vol. 8. p. 194, pi. 8, fig. 13. 1900.] E. aurnta Doane 



5. Thoracic dor.sum gray; antennae of male elongated 6 



Thoracic dorsum brown or black ; antennae short in both sexes 7 



6. Vertical tubercle of male very large and high, greater than length of eye; first segment 



of antennal scape uniformly dark; prescutal stripes broad, dark brown, the median 

 stripes about confluent and continued cephalad to the pronotum; cell 1st Mi of wings 

 short, pentagonal, usually with a spur into cell R; valves of ovipositor short, blunt, 

 sub-fleshy. [Anisomera longicomis Walk., List Dipt. Brit. Mus., vol. 1, p. 82. 1848.] 



(Plate XXXVII, 107.) E. longicomis (Walk.) 



{E. gihbosa Doane [Journ. N. Y. Ent. Soc, vol. 8, p. 193, pi. 8, fig. 10, 1900] is a 

 doubtful species; in its coloration and, especially, in its venation, it is strikingly like E. 

 longicomis [Walk.], but there is no mention in the original description of the size of 

 the antennae.) 

 Vertical tubercle of male moderate in size, not so high as length of eye; first segment 

 of antennal scape pale beneath; prescutal stripes narrow, pale brown, the two middle 

 stripes separate, becoming obliterated at about the level of the tuberculate pits; cell 

 1st M'. of wings long, hexagonal; valves of ovipositor elongated, pointed, chitinized. 

 [Psyche, vol. 19, p. 169-170, pi. 13, fig. 9. 1912.] (Plate XXXVII, 108.) . . E. cinerea Alex. 



7. Cell R- short, cross- vein r inserted on Ri+z. [Psyche, vol. 19, p. 168-169, pi. 13, fig. 7. 



1912.] (Plate XXXVII, 111.) E. fullo7iensis Alex. 



Cell R2 deep, cross-vein r inserted on Ri 8 



8. Wings brown, the stigma small, rounded, brown; abdominal tergites brown. [Proc. 



Acad. Nat. Sci. Phiia., p. 243, pi. 3, fig. 31. 1859.]. E.fuliginosa O. S. 



Wings blackish brown, the stigma oval, dark brown; abdominal tergites black. [Proc. 

 Acad. Nat. Sci. Phila., p. 602. 1914.] (Plate XXXVII, 110.) E. tristis Alex. 



