SPONGILLA-FLIES — PARFIN AND GURNEY 521 



veins between R2 and R3, and between R3 and E4 + 5; two radio- 

 medial cross-veins between R44-5 and MA, or MA fork; three medial 

 cross-veins between MA and MPl + 2; two medial cross-veins between 

 MPl+2 and MP3-}-4; three mediocubital cross-veins between MP 

 and MPS +4 and Cul ; one cubital and one cubito-anal cross-vein, one 

 anal cross-vein between 1st and 2d A; outer gradates of about five 

 to seven cross-veins, inner of five to seven cross-veins; thyridia at 

 point of meeting of MPl-|-2 and 1st r-m. 



HiNDWiNG (pi. 3, fig. 3) : Costal area with costal cross-veins before 

 pterostigma numerous, sometimes more than 20; subcostal area with 

 one or two subcostal cross-veins, more narrow than in Sisyra; Sc not 

 appearing fused with Rl but seemingly connected by a subcostal 

 cross-vein to Rl at apex; Rs after branching off from Rl near base, 

 continuing free basally for a shorter distance than in Climacia, then 

 separating and proceeding anteriorly back toward Rl and forking 

 into two main forks, R4 + 5 and R2 and R3 a short distance beyond; 

 MA separating off into a free oblique piece, shorter and straighter 

 than that of Sisyra or Climacia; MP forking into MPl -}-2 and MP3+4 

 basad of point of separation of MA from Rs; Cul separating from Cu2 

 near base of wing, with several marginal branches ; usually three radial 

 cross-veins, two or three sectoral cross-veins, two radiomedial cross- 

 veins, two medial between MA and MPl +2 and one between MPl-|-2 

 and MP3+4, one mediocubital, one cubito-anal, one anal between 1st 

 and 2d A ; outer gradates of approximately seven to eight cross-veins, 

 inner gradates of two or thi'ee cross-veins; thyridia not pronounced. 



Male genitalia: Not studied, differing from other genera. 



Female genitalia: Eighth tergite divided middorsally, fused 

 midventrally; ninth tergite divided in two, each part moved dorso- 

 ventrally to tenth tergite, with long articulation ridge posteriorly; 

 tenth tergite broader than long; ninth sternite divided into two broad 

 elongate upturned parts terminating bluntly with median longitudinal 

 streak, articulated at base to halves of ninth tergite; remaining tergites 

 and sternites long and broad. 



The position of Neurorthus in the Sisyi'idae is still not settled and it 

 appears to be the only genus in the Sisyridae thus far showing the 

 free basal piece of MA after it has separated from MP and before it 

 has coalesced with R in the forewing, which is characteristic of many 

 of the genera of the Hemerobiidae and related families (Carpenter, 

 1940, p. 194). Lestage (1924, p. 65; 1935, pp. 389-390) has also 

 questioned its position in the Sisjrridae. However, the character in 

 the forewing, wherein all branches of Rs arise from a single Rs stem, 

 is typically sisyrid. Although the life history of none of the species 

 of Neurorthus has been worked out, some adults have been taken near 



