THE CANADIAN ENTOMOLOGIST. 301 



The punctuation of the penultimate ventral segment in the $ is 

 diverse in the different species ; thus in riifitarsis, Porterce and 

 Apacheorum there are numerous small punctures interspersed among the 

 large ones ; in menthce, Gilensis and grindelice the punctures are large, on 

 a shining surface, without little ones interspersed ; in deplanata, ribis 

 and moesta the punctures are small and very dense posteriorly, and 

 larger and well separated on the anterior part of the segment. 



Coelioxys ribis, n. sp. 



Romeroville, April 29, 1899, ^^ flowers of wild gooseberry (Wilmatte 

 Porter). $. Length about ii mm., rather broad, superficially like C- 

 grindeliiz, but the abdomen tapers more rapidly ; the pubescence is white ; 

 the hair on the eyes is very long (it is very %\iOx\.\Vi gri?ideliie) ; the 

 inner orbital margins diverge much more above ; the punctures of the 

 mesothorax are sparser in the middle, leaving some shining surface 

 between ; the teeth of the scutellum are shorter ; the apical projection of 

 the last ventral segment is longer and narrower \ the mesothorax is quite 

 hairy, but has no distinct hair-patches ; the penultimate ventral segment 

 is dull, roughened with excessively close minute punctures posteriorly, 

 sparsely punctured anteriorly. 



SYNOPSIS OF FOOD-HABITS OF THE LARV^ OF THE 



SESIID^. 



BY WILLIAM BEUTENMTJLLER, NEW YORK. 



The larvaj are universally borers, but in the choice of food-plants 

 there is the widest diversity; some bore through and devour solid wood, 

 as do the larv?e of the Cossids ; some prefer the pith of woody stems ; 

 others are found in the superficial woody layers ; still others affect the 

 roots of plants both woody and herbaceous, or are sometimes to be found 

 in the borings made by other insects, as is the case with ATemythrus 

 tricinctus, Sesia pidipes, S. scitula, and others. The larvae are yellowish 

 or dirty white, beset with only a (tvf short hairs. The head and cervical 

 shield are chestnut brown. They hibernate in various stages of growth, 

 but do not overwinter in the pupal stage, as far as the species of the 

 northern States are concerned. The larvae of Melittia satyriiiiformis 

 hibernate fully grown in the cocoons. When fully developed they spin 

 elongate oval cocoons composed of chips cemented together by a gummy 

 secretion or silk. The cocoons are formed in the burrows or in contigu- 

 ous places. 



