THE CANADIAN ENTOMOLOGIST. 273 



DESCRIPTION OF THE FULL-GROWN LARVA OF GRAPTA 



J-ALBUM. 



BY DR. JAMES FLETCHER, OTTAWA. 



On the 14th June, at one of the excursions of the Ottawa Field 

 Naturalists' Club to Cumberland, Ont., I was fortunate enough to find 

 beneath an elm tree ( Ulmus americana), a full-grown larva of Grapta 

 J-Album, of which the following is a description : 



Length, one and one-half inches. Shape slightly fusiform, gradually 

 tapering to the end from fourth segment. General colour, a delicate 

 glaucous green, or white washed with green — with black spines, which 

 from the size of the body appear to be rather sparsely distributed. The 

 three dorsal series of spines black, springing from a bright yellow field, 

 which is three times the diameter of the base of the spine. The head 

 large, very bristly and tuberculate. Head black at the sides and white in 

 front ; face white, cheeks and sides of head black, including the ocellar 

 field and two large apical compound spines ; the cheeks black, covered 

 thickly with large white elongated and slightly curved cone-shaped (or 

 sugar-loaf shaped) setiferous tubercles, which are almost long enough to 

 be called short thick bristles, each one bearing at its apex a slender 

 bristle. These bristles are black or darkened on the tubercles of the 

 upper and lower parts of the head. Ocellar field black and distinctly 

 margined against the white face ; mandibles black, frontal triangle white 

 clearly outlined with black ; head bearing on each side of apex a large? 

 stout, conspicuous, jet black branched spine, with about five smaller sized 

 spinelets, all of which bear black bristles at apex. Behind the cheeks 

 and running down from the apex, being in fact a continuation of the white 

 face, is a white band, which gives the appearance of the head being white, 

 with a large black area on each side, which includes the apical com- 

 pound bristles and the mouth-parts. 



Down the dorsal area are three series of black branched spines, with 

 5 to 7 branches — a medio-dorsal series, a lateral series, and a supra- 

 stigmatal series — all black and bearing from five to seven spinelets. The 

 spines of the lateral series half as long again as those of the three other 

 series of bristles. Spiracles black, and beneath these is a sub-stigmatal 

 series of branched spines similar to those above the spiracles, but white ; 

 the bristles only at the tips of the branches being slightly infuscated. 

 The position of the branched spines of the larva is as follows : The 



