THE CANADIAN ENTOMOLOGIST. 137 



This genus is parasitic on that of Bombus, and resembles it very 

 much in general appearance. The characters with which to distinguish it 

 from Bombus are as follows : The posterior tibise are destitute of corbiculae 

 (or baskets) and are convex exteriorly ; the basal joint of the posterior 

 tarsi has no tooth at its base above. In the female the apex of the abdo- 

 men curves under, and the apical segment beneath has the lateral margins 

 elevated. The mandibles have a single notch, while those of Bombus are 

 distinctly toothed. This genus has no workers. 



The males may be distinguished from those of Bombus by the pos- 

 terior tibiae being exteriorly convex and thickly coated with short hairs. 

 The males of the latter genus have the exterior surface of the posterior 

 tibiae concave in the centre, with a few scattered hairs, and are fringed at 

 the exterior margins. 



The economy of our species is almost unknown. 



J, 1ST OF BEES OF THE GENERA BOMBUS AND APATHUS TAKEN IN 

 THE PROVINCE OF QUEBEC. 



Bombus, Latreille. 



Virginicus, Oliv. i male, 4 females, 1 worker ; Quebec. Montreal. 



Separatus, Cresson. 1 male ; Montreal. 



Vagans, Smith. 2 females, 1 worker ; Quebec, Montreal. 



Perplexus, Cresson. 1 male ; Montreal. 



Fervidus, Fab. 1 male, 3 females, 2 workers ; Quebec, Montreal. 



Pensylvanicus, DeGeer. 1 female ; Montreal, Quebec (Provancher). 



Terricola, Kirby. 2 females ; Quebec, Montreal. 



Ternarius, Say. 1 male, 6 females, 2 workers ; Quebec, Montreal. 



Flavifrons, Cresson. 1 male, 3 workers ; Montreal. 



Sylvicola, Kirby. 3 workers ; Montreal. 



Apathus, Newm. 



Ashtoni, Cresson. 1 male, 2 females ; Quebec, Montreal.. 

 Flatus, Cresson. 3 females ; Montreal. 



THE HESSIAN FLY. 

 The following .circular in reference to the Hessian Fly has been issued 

 from the office of the U. S. Entomological Commission. The subject is 

 a most important one, and fearing it might not otherwise reach all our 

 readers, we present it here : 



