OF NORTH AMERICA. 101 



BOMBYCID^ffi. 



CERATOCAMPIN^. 



Geuus HEMILEUCA. Walker. 



"Front of the head broadly subtriangular, spreading pilo.sc. Joints 

 of the antennae short, a little serrated beneath, with broad pectinations, 

 each joint being provided with two pairs of pectinations, of which the 

 second is nearly obsolete. Eyes small, sunken. Foramina large and 

 conspicuous when the head is denuded. Mandibles obsolete, repre- 

 sented by a slight elevated line curving inwards towards the narrow 

 linear mouth. The ma.xillai form the membranous ridges diverging 

 from the under side of the mouth. The palpi consist of two small 

 elongated cylindrical tubercles, witli a few long scattered scales. Thorax 

 short and round. Fore wings scarcely longer than the body, one half 

 as long as broad ; costal margin straight, rounding at the apex ; outer 

 margin very oblique. Third and fourth subcostal nervules arise farther 

 out than the first median, and the discal area is produced outward at 

 their origin, and made narrower by the angulatcd base of the first median. 



"Secondaries reach nearly to the tip of the outer margin. Discal 

 nervules situated beyond the middle of the wing the subcostal and 

 median nervules being short. Wings sparsely covered with narrow 

 subtriangular scales, laid on more thickly at the base and along the 

 costa of the wings, while the middle area is partially translucent. An 

 irregular dark patch surrounds the narrow linear transparent discal 

 region. An irregular light translucent broad mesial band crosses both 

 wings alike. The fore tibiae are densely pilose. Tarsi thickly spined 

 beneath ; ungues long and slender." 



Pack., Proc. Ent. Soc. Phil., vol. 3, p. 382. 



The above diagnosis was drawn up from H. maia. and appeared as 

 Euchronia of Packard. The four species found in North America 

 may be tabulated thus : 



* All the wings with pale markings. 

 \ Light band continuous. 



Patagia black ------- H. maia. 



Patagia whitish - - - - - - H. nevadensis. 



ff Light band broken - H. Grotei. 



** Primaries only with pale markings - - . . H.jimo. 



*** Primaries without pale markings - - - H. Californica. 



