THE CANADIAN ENTOMOLOGIST. 237 



I 



immaculate or with more or less distinct traces of a dusky lateral band ; 

 rarely a faint black suranal dot. 



Stage 6. — Head whitish, with a brown shade over the vertex, or pale 

 brown, immaculate or with the three black patches ; eye black ; a groove 

 at the vertex of each lobe ; width 1.3 to 1.5 mm. Thorax enlarged, 

 mostly dorsally, the lateral outline regular ; segments neatly 6-annulate, 

 . with minute blunt white points on the second and fourth annulets. 

 Whitish, not shining, a faint green tint dorsally. Thorax dark green from 

 the large crop full of food ; posterior portion of alimentary canal nearly 

 empty ; dorsal vessel greenish. No marks or a lateral smoky black band 

 of segmentary dusky patches and traces of a geminal dusky dorsal shade. 

 A small quadrate black suranal patch. Thoracic feet colourless, with 

 brown tips ; tracheae not very evident. Sits with the body outstretched 

 or curled. 



Stage 7 (ultimate stage*). — Head sordid whitish, vinous tinted or 

 pale greenish, immaculate or with the spots represented by leaden or tar- 

 brown shades ; width as before. Body the same colour, more or less 

 shaded with tarry-brown in the folds and in an indistinct subdorsal shade. 



Caliroa obsoleta, Nort. (Can. Ent., XXVH., 338, jS.) 



Head very pale testaceous, eye black ; width .7 mm. Body colour- 

 less or very faintly greenish, food showing distinctly. Skin shining and 

 sticky; feet on joints 6 to 12, all colourless, including the thoracic feet. 

 Thorax enlarged, the feet truncate. 



Ultimate stage. — Not shining, rather opaque pale whitish ochreous ; 

 segments obscurely annulate, with transverse dorsal shining areas. 



Feeds on wild cherry ( Prumis serotina and P. pe?insylvatiica). 

 Rests on the under side of the leaves, never on the upper ; solitary. 

 The larva is smaller than Eriocampa cerasi, without any trace of the 

 blackish colour. 



The variation in the number of submarginal cells and in the colour 

 of the head in the larva of Harpiphorus viaailatiis recalls the case of 

 Monostegia querciis-albce. If we disregard the colour of the head here 

 also, there are still three well-marked types of larvae as follows : — 



I. On white oak, rarely on black oak ; sides of the thorax concolorous 

 with the body; head colourless, pale brown or black. Imago, 16 speci- 



* I propose this term for that final larval stage of certain sawflies in which they do 

 not feed, but only seek for a place for pupation ; the colour is usually markedly different 

 from the iireceding stage, but the head has the same width. 



