THE CANADIAN ENTOMOLOGIST, 195 



Last stage. — Perfectly smooth, pale honey-yellow, almost whitish. 

 The larvi« enter the earth on acquiring this stage without feeding. 

 Monostegia qnerciis-albce^ Norton. 



My specimens vary in having one or no middle cells on hind wings. 

 The latter is, in fact, the more common, and the specimens appear to be 

 Caliroa obsoleta of Norton. The larvae, as described by me (Can. Ent., 

 XXVI., 43), differed from Norton's description in having the head black. 

 I have, however, obtained larvae like those of true q.-albce, and the fly is 

 before me. It was submitted to Mr. MacGillivray, who pronounced it to 

 be M. q.-coccinece, but I can scarcely agree with him, as the wings are 

 hyaline. 

 Monostegia quercus-coccinece, Dyar. 



Recent specimens vary in having one or two middle cells on the 

 hind wings. Those with two middle cells seem to fit the description of 

 Eriocampa fasclata, Nort., and I may be in error in having described the 

 species as new, provided the larval characters prove illusory. 

 Eriocampa cerasi, Peck. 



My specimens vary in having two or one middle cells on hind wings. 

 One specimen has the lower cell present on one side, the upper present 

 on the other with a portion of the cross-vein of the lower. 



Larva common on Cratcegus sp. and on Amelanchier canade7isis at 

 Woods' Holl, Mass., in July; imago in August. The larva has been 

 often described. It has a final stage (sixth), in which the head does not 

 grow and the larva does not eat, as in the four preceding species. 

 Widths of head : (i) 0.25 mm. (?) [not measured], (2) 0.35 mm., (3), 

 0.55 mm., (4) 0.8 mm., (5) i.i mm., and (6) i.i mm. 



The following synopsis will separate the larvas of this group as far as 

 thev are known to me : — 



Larva not shining, greenish (Rosa) Monostegia rosce. 



Larva shining, slimy. 



Larva large, blackish (Pyrus, etc.) Eriocampa cerasi. 



Larva smaller, whitish. 



Sides of thorax orange tinted (Quercus coccinea). 



Head black Eriocampa fasciata. 



Head pale Monostegia q.-coccinece.. 



Sides of thorax concolorous, whitish (Quercus alba). 



Head black * Caliroa obsoleta. 



Head pale t , Monostegia q.-albce. 



* M. q.-alb,v, Can. Ent., XXVI., 43. 



\ M. q.-albic oi Norton. Fly determined by MacGillivray differently, but I can- 

 not corroborate him. 



