SPONGILLA-FLIES — PARFIN AND GURNEY 461 



Head with vertex usually yellow, occasionally some brown, narrow 



edian blackish streak over coronal sulcus from posterior margin 

 Lo midvertex usually distinct, usually a narrow blackish ring around 

 mtennal sockets; face yellowish; palpi yellowish to brownish; basal 

 iiwo antennal segments usually brown, remaining segments yellowish 

 to end or brown for 18 segments (approximately) and then yellowish 

 to end (approximately 42-50 segments altogether); legs yellow with 

 coxae brown and sometimes femora and tibiae with some brown; 

 actum medium brown, pleura brown; abdomen brown. 



FoREWiNG (pi. 1, fig. 3): Average length female 5.5 mm., male 

 5.4 mm., average width female 2.4 mm., male 2.3 mm.; apex slightly 

 asymmetrical with respect to longitudinal axis of wing; membrane more 

 or less uniformly light brown (with occasionally a few indications 

 of faint light brown streaks particularly near cubital and medio- 

 cubital areas toward inner margin); longitudinal and cross-veins 

 'brown; pterostigma slightly darker than membrane; R2 forked basad 

 of or at level of junction of Sc and Rl; R3 and R4+5 usually not 

 forked as deeply from margin, although R4+5 sometimes with ter- 

 minal fork near level of junction of Sc and Rl ; MPl +2 usually forking 

 into two even branches to margin; Cul with three to five branches 

 to margin; approximately 12-15 costal cross-veins before pterostigma; 

 usually three radial cross-veins, 1st r above and usually near midpoint 

 of free stem of Rs, 2d r above R2 near forking of R2 and R3, and 3d 

 r below pterostigma to R2 or R2 terminal fork (in rare cases where 

 fork is lacking); sometimes a 2d or even 3d (rarely) r-m present; 

 marginal forking well-developed. 



Hind WING (pi. 1, fig. 3): Average length female approximately 

 5 mm., male 4.6 mm., width female approximately 2.2 mm., male 2 

 mm.; membrane almost hyaline with pterostigma slightly darker 

 brown than membrane; venation brown; R2, R3, and R4+5 usually 

 with terminal forks distad of level of point of coalescence of Sc and 

 Rl; about three to seven branches of Cul to margin; two radial 

 cross-veins, 1st r slightly distad of forking of R2 and R3 from Rs; 

 2d r to R2 or R2 fork under pterostigma near margin; marginal forking 

 well developed. 



Male genitalia (fig. 14,a,b): Eighth tergite with central portion 

 short; two parts of ninth tergite small, more or less triangle shaped; 

 tenth sternite with basal plate almost as long as claspers; claspers 

 short, squat, curved, v/ith sharp angular drop to terminal conical 

 narrow portion, which is about one-third as wide as broad basal 

 part of clasper, two setalike projections at end of each clasper; 

 parameres "boot shaped." 



Female genitalia (fig. 14, c): Eighth tergite longer just above 

 spiracle, shorter just below spiracle, then lengthening ventrally; 



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