222 



THOMAS SAY FOUNDATION 



Genus LEUCTRA Stephens. 



1836. Leuctra Stephens, 111. Maud., 6:145. 



L842. Leuctra Piotet, Perlides, p. 363. 



3861. Leuctra Hagen, Syn. Neurop. X. A., p. 37. 



1894. Leuctra Morton, Tr. Ent. Soc. Loud., p. 559. 



1898. Leuctra Kempny, Verh. K.-K. Zool-bot. Gesell. Wien. 



1907. Leuctra Banks, Cat. Neurop., p. 14. 



1909. Leuctra Enderlein, Zool. Anz., 34:394. 



Size small, seldom over 10 

 mm. long; second tarsal seg- 

 ment very short; cerci com- 

 posed of a single segment; 

 wings involute at rest, uni- 

 formly hyaline or smoky, 

 never banded ; subcosta runs 

 out to the costal margin, and 

 at the tip, or just before, 

 drops down a vein (Sc2) to 

 radius at right angles ; radial 

 sector forked but once, the 

 single fork originating at or 

 before the cord; no M-Cu 

 crossveins beyond the cord; 

 several Cu crossveins beyond 

 the cord ; Cul of forewing 

 without accessory brancnes, 

 Cul of hind wing forked; 

 radial sector of hind wings 

 originates from the same 

 crossveins from which media 

 springs ; anal field of hind wing narrow. 



Male. Ninth sternite produced into a short sub- 

 genital plate which usually bears a short hairy ventral 

 lobe near the base ; supra-anal process small, triangular or 

 rounded and sometimes bent under the tenth tergite ; cerci 

 either unmodified or heavily chitinized and armed with 

 hooks or spines ; subanal lobes produced into slender chiti- 

 nous processes and lying just outside of each of these lobes 

 there is usually another more slender, pointed chitinous 

 process (titillator of Klapalek). These titillators in all 

 probability are parts of the subanal lobes; seventh and 

 eighth tergites often with chitinous hooks or processes, 

 which furnish excellent specific characters. 



Female. Seventh abdominal sternite unmodified ; eighth 

 sternite usually bearing a distinct, notched subgenital 

 plate. 



Fig-. 26. Leuctra kamula Clsn. 



