SPONQILLA-FLIES — PARFIN AND GURNEY 479 



mately nine costal cross-veins before pterostigma; two radial cross- 

 veins, 1st r slightly distal to midpoint of free stem of Rs, 2d r slightly 

 distal to longitudinal midpoint of wing; r-m from R44-5 to MA; 

 mai'ginal forking less extensive. 



Hind WING (pi. 1, fig. 6): Length approximately 2.7 mm.; width 

 1.1 mm.; membrane almost hyaline, slightly tinted brownish, ptero- 

 stigma slightly darker; sectoral branches with short terminal forks; 

 MA, MPl-l-2 and MP3-f-4 with deeper marginal forks basad of level 

 of pohit of coalescence of Sc and Rl; Cul with three widely spaced 

 branches to margin; marginal forking scant}'. 



Male genitalia (fig. 15): Eighth tergite entire, broad, short, 

 tapering lateroventrally; two parts of ninth tergite long, narrow, 

 irregularly shaped, appearing almost united with tenth tergite; 

 ninth stemite large, heavilj'^ setose, much longer laterodorsally than 

 medioventrally; tenth sternite with basal plate about one-half length 

 of claspers, anterior margin concave, lateral margins with deep in- 

 cisions; claspers of moderate length, broad, shaped like a parrot's 

 beak from lateral view, apices acute and directed medioventrally; 

 pai'ameres almost completely concealed by claspers, dorsal portion 

 broad, central piece narrow and ventral portion tapering anteriorly 

 and posteriorly. 



Holotype: a male (pinned) from "Unt. Amaz. Taperinha b. 

 Santarcm, l-10.viii.27, Zerny"; in Naturhistorisches Museum, 

 Vienna, Austria. 



Taderinha was misspelled to "Taperinha" on the type label. The 

 collecting data for the type is thus interpreted: Brazil, Lower 

 Amazons, Taderinha, near (approximately 20-25 miles east of) 

 Santarem, August 1-10, 1927, collected by Dr. H. Zerny. 



The holotype has the left antenna beyond the basal segment and 

 the tip of the right antenna missing (31 segments remainmg) and 

 the right and left hindwings are torn below the apex. It was lent 

 for stud}?^ through the courtesy of Dr. Max Beier of the Naturhisto- 

 risches Museum. 



The female is unknown. 



This is the only South American species of Sisyra recognized thus 

 far, and it is the smallest species. It is a very distinctive species, 

 standing apart from others in a number of characters: its smallness, 

 the angular bend and dip of Rl where it meets Sc, the free course 

 of Sc to the margin, the two radial cross-veins coupled with the almost 

 uniform membrane tinting and lack of intervenational streaking, 

 the unusual male genitalia, and the entiret}^ of the eighth tergite. 

 Some of these features might suggest another genus. However, 

 the palpi, pronotum, and venation in general are similar to other 

 species of Sisyra. The angular bend of Rl under the pterostigma 



