SPONGILLA-FLIES — PARFIN AND GURNEY 481 



beloAv the ptcrostigma; Rs+^IA separating off from Rl near base, Rs 

 separating from MA slightly basad of 1st r; free stem of Rs with one 

 main fork into R2 + 3 and R4 + 5 beyond longitudinal center of wing; 

 MA dividing into two branches usiialh^ under pterostigma, but some- 

 times near center of wing; MP forking into MPl+2 and MP3+4 near 

 level of point of separation of Rs from MA; MPl+2 and MP3+4 

 with terminal forks under pterostigma, usually at about level of point 

 of coalescence of Sc and Rl; Cul separating from Cu2 near base of 

 wing; 1st and 3d A usually simple; 2d A usually with marginal fork; 

 3d A running into and coalescing with 2d A before margin; usually 

 three (rai'ely two) radial cross-veins between Rl and Rs; two radio- 

 medial cross-veins between Rs and R4-}-5 and MA; three medial 

 cross-veins between MA and MPl-|-2 and one medial cross-vein 

 between MPl+2 and MP3+4; tliree mediocubital cross-veins 

 between MP and Cul; one cubital cross-vein between Cul and Cu2; 

 one basal cubito-anal cross-vein between Cu2 and 1st A; one anal 

 cross-vein between 1st and 2d A; two series of gradate cross-veins, 

 three inner gradates (2d r, 1st r-m, 2d m between MA and MPl-f 2), 

 and five to eight outer gradates (3d r, 1st s, 2d s when present, 2d 

 r-m, 3d m between MA and MPl-|-2, m between forking of MA when 

 present, m between MPl-f 2 and MP3-K4, 3d m-cu). 



Hind WING (fig. 11): Costal area with approximately 7-11 costal 

 cross-veins basad of pterostigma; subcostal area broader than costal 

 area, with one indistinct basal subcostal cross-vein; Sc appearing to 

 be coalesced with Rl at apex; Rs, after branching off from Rl near 

 base, proceeding for a longer distance than in Sisyra, then coalescing 

 with MA and finally separating from MA at about center of wing, 

 then proceeding anteriorly back toward Rl; forking into one main 

 fork of R2-f 3 and R4-|-5, usually at a point slightly basad of point 

 of coalescence of Sc and Rl or under pterostigma; MA separating 

 off from MP farther from costal margin of wing than in Sisyra into 

 a free sinuate section, which curves toward and coalesces with Rs 

 for a short distance, then separates and forks at margin; MP forking 

 into MPl-|-2 and MP3-F4 near center of wing at about point of 

 separation of Rs from MA; MPl-f 2 usually with terminal fork at 

 about level of point of coalescence of Sc and Rl; MP3+4 frequentlj^ 

 without terminal fork; Cul separating from Cu2 near base of wing, 

 with almost parallel marginal branches; 1st A usually simple; 2d A 

 usually with marginal fork; usually two radial cross-veins, the first 

 basad of point of coalescence of Sc and Rl, and the second usually 

 below the pterostigma; one sectoral cross-vein between R2-f 3 and 

 R4-f-5; one distal radiomedial cross-vein; three medial cross-veins, 

 two between MA and MPl+2, one between MPl+2 and MP3+4; 

 one mediocubital cross-vein to branches of Cul; one cubito-anal 

 cross-vein basally between Cu2 and 1st A; one anal cross-vein between 



