THE LEPIDOPTERIST 79 



prominent, where it rather seems to fade out in 

 infans, also the outer marginal, black, irregular line 

 is strong. The yellowish spot is very strong be- 

 tween veins 2 and 3 which is lacking in Prephos 

 infans. 



The genitalia of oregonensis is quite distinct from 

 infans though closely allied. The uncus is very long 

 and curved over, the tip being gouge shaped, where 

 infans is shorter, narrower and rather pointed. The 

 valvae of oregonensis are wide at base and slim at tip 

 with slight angulation just before tip. This angula- 

 tion is not pronounced in infans, but the shape of 

 the valvae are very similar. The penis of oregonensis 

 is broad with band of short spines about three- 

 fourths out from base. The vesica has two or three 

 spines, the terminal one being quite thick and long. 

 Brephos infans has the penis more tapering at tip 

 and lacks the spines, but has spines on the vesica. 

 This race would be hard to separate if it were not 

 for the genitalia, and it only emphasizes the fact that 

 in the future this must be carefully studied. I think 

 that many difficult species may be separated and the 

 relationship shown if we could give the genitalia and 

 life histories together. 



Expanse 36 m. m. 



Holotype May 15, 1917, Pot Orford, Oregon, in 

 the collection of Mr. Samuel E. Cassino, Salem, Mass. 



A New Form of Catocala ultronia 



By Samuel E. Cassino, Salem, Mass. 

 Catocala ultronia form nigrescens nov. 

 The male expands two inches, the female two and 

 one half inches. This is a very dark variety of this 

 variable species. The head, thorax and abdomen 

 are just a shade darker than the typical ultronia. 

 Nearly the entire surface of the superiors are very 

 dark, there being almost no grayish scales on the 

 wings, the usual markings thus becoming very indis- 

 tinct and nearlv lost. 



