86 THE CANADIAN ENTOMOLOGIST. 



large ; a slight depression behind thorax dorsally ; no cremaster ; colour 

 red-brown ; cases finely wrinkled ; dull ; body smooth, slightly shiny. 

 Length 17 mm.; width 5 mm. Duration of this stage, through the winter. 



Food plant : Wild Cherry ( Prunus serotina). 



Larvae from Dutchess Co , N. Y. 



Widths of head for the several stages, calculated from the 'width at the 

 last stage, ratio .68, are: — .77 mm., 1.13 mm., 1.66 mm., 2.45 mm., 3.6 

 mm. Observed : — i.i mm., 1.6 mm., 2.5 mm., 3.6 mm. 



The species of Cerura may be separated as follows : — 



Primaries crossed at basal third by a dark gray band. 

 Primaries white. 



Six black spots in an ellipse on disk borealls, Bd. 



Indistinct dental lines on disk. 



Transverse band broad aqiiilotiaris, Lintn. 



Transverse band narrow, sometimes broken . . aibicovia, Strk. 

 Primaries pale cinereous. 



Three dentate lines on disk occidentalis, Lintn. 



A row of dots on disk var. cmereoides, Dyar. 



Primaries dark cinereous cinerea, Walk. 



Primaries crossed by many dentate black lines. 

 Secondaries white. 



Lines continuous scitiscripta, Walk. 



Lines interrupted var. Candida, Lintn. 



Secondaries black imi/tiscripta, Riley. 



Of these the larvae of four are known and can be separated by the 

 following table : — 



No dorsal process on metathoracic segment. 

 Edges of dorsal band even. 



Dorsal elevation on mesothoracic segment simple. . . .bore- 



\alis, lid. 



Dorsal elevation double occidentalis, Lintn 



Edges of dorsal band irregular. 



Band spotted with yellow cinerea. Walk 



Band spotted with crimson and yellow .... var. cine?-eoidcs, 



[Dyar. 



A distinct dorsal process on the metathoracic segment mtilti- 



\_scripta, Riley. 



