16 NEW YORK STATE MUSEUM 



I have in hand a study of the venation of the H e m e r o - 

 biidae. This material, especially He me robins amicu- 

 1 u s Fitch, and another of Fitch's rare species, H . o c c i - 

 den talis from Illinois (which I have recently received from 

 Wisconsin), together with other species of Heme robins col- 

 lected at Saranac Inn, Ithaca and in Hlinois, have thrown some 

 light on the evolution of the peculiar Hemerobian type of venation. 

 My study will in due time be published elsewhere when it is com- 

 pleted; and the results to be noted here are merely that H . a m i - 

 cuius Fitch and H. occidentalis Fitch represent 

 two stages in the evolution of the t^ipe which should be marked 

 by generic rank. I therefore characterize them here and in the 

 form of a key, because the key to H e m e r o b i i d a e in bulletin 

 47 was not made complete for our genera : 



KEY TO THE GENERA OF HEMER03IIDAE 



a Branches of the radial sector arising {i. e., sepa- 

 rating from vein R,) by a common stalk 



h With three ocelli D i 1 a r 



fi& With no ocelli 



c Humeral crossvein (the basal costal cross- 

 vein) simple and not recurrent 

 d Some of the" branches of vein Cuj forked. . S i s y r a 

 (Id All of the branches of vein Cui simple. ... C 1 i m a c i a 

 cc Humeral crossvein recurrent and bearing a 

 number of branches on its outer side 

 d Subcosta and radius separate at the tips. . Polystoechotes 

 dd Subcosta and radius conjoined at the tips. . B e r o t h a 

 Art Branches of the radial sector appearing to arise 

 separately from vein R, 

 h Humeral crossvein unbranched and not recur- 

 rent (pi. 3, figs. 1 and 2) M i c r o m u s 



hi) Humei'al crossvein recurrent and with branches 

 on its outer side 

 c First division of the radial sector arising 

 before or opposite the basal subcostal 

 crossvein ; in the hind wing the vein 

 ]\r,+2 is well separated from the base 

 of the I'adial sector, with a distinct 

 crossvein between 

 d A closed cell in the first fork of the radius 

 before the base of the second division 

 of the sector (pl.2, fig.2); front coxae 

 longer than the femora 



Spadobius n. gen. type H. occidentalis Fitch 



