264 



NEW GENERA AND SPECIES OF MEGALOPTERA. 



Sialis japonica, nov. spec. 



Sialis spec. Mac Lachlan, Ent. monthl. Mag. VII, p. 146 (1870), Japan; 

 Transact. Ent. Soc. Lond. 1875, p. 174 (1875). 



This species belongs to the nearest related of fuliginosa 

 by its external characters, size etc. 



The costa is black at the base, the two markings on 

 the occiput are somewhat divergent and the wings are 

 more or less dark smoky brown. 



The genitalia, however, are very different and as the 

 female only is known, there is an interesting resemblance 

 with infumata Newm. from N. America, as the hindborder 

 of the 7 tQ sternit bears a small semicircular excision in 

 the middle. The 8 th sternit is a solid piece with straight 

 hindborder and broadly bilobed frontborder. The first bears 

 in the middle a hyaline hexagonal piece, which has a small 

 distal knob. 



Habitat : Japan. 



1 examined three females from Japan in de Selys' col- 

 lection, and in the Museum of Paris and of Leyden. The 

 male is unknown. 



Leyden, February 20, 1909. 



Notes from the Leyden Museum, Vol. XXX. 



