SPONGILLA-FLIES — PARFIN AND GURNET 



469 



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. 13,a,b,d): Eighth tergite appearing divided 

 in two with almost invisible median portion; two parts of ninth tergite 

 small, irregularly shaped, usually with a narrow posteroventral pro- 

 jection; tenth tergite with u-regular lateroventral margins; ninth 

 sternite large, long, heavily setose, almost rectangular; tenth sternite 

 with short basal plate, less than half as long as claspers; claspere 

 moderately long, thick at base, with rounded ciu've preceding terminal 



Figure 15. — Terminal abdominal segments of Sisyra minuta Esben-Petersen, male, 

 holotype. A, lateral view; B, dorsal view. 



portion which tapers almost to a point, two distal toothlike pro- 

 jections at end of each clasper; parameres "leglike," broad antero- 

 dorsally, then narrowing, becoming more twisted and diverging into 

 terminal "foot" with "toes" pointing medially toward bases of 

 claspers. 



Female GENITALIA (fig. 13,c): Eighth tergite short dorsally, length- 

 ening above and shortening around spiracle and then gradually 

 lengthening ventrally; ninth tergite with each lateroventral half 

 large, more or less triangle shaped with one posterior articulation 

 ridge, greatest width at proximal border, dorsal border sloping 

 obliquely posteroventrally, ventral mai'gin distinctly rounded; tenth 

 tergite tapering strongly lateroventrally. 



Holotype: A female (pinned), labeled Hemerohius juscatus Fabri- 

 cius; in Universitetets Zoologiske Museum, Copenhagen (Dania 

 D. de Sehestedt). 



The holotype, kindly examined by Dr. S. L. Tuxen of the Uni- 

 versitetets Zoologiske Museum, bears a label with only the name H. 

 juscatus on it. Dr. Tuxen wrote: "But that seems always to be the 

 case when the insects were collected by Sehested(t) or T0nder Lund 



359326—66 7 



