182 AMERICAN HYMENOPTERA. 



3. Laboriosus Group. 



Not certainly known to be represented in the Old World. 



4. Other Groups. 



Campestris (Panz.) and barbutelhis (Kirby) represent two 

 distinct groups not found in the New World, and rupestris 

 (F.) apparently represents a third, though that species seems 

 to show some affinities, in its male genitalia, with the species 

 of the Laboriosus Group. 



Genus BOMBUS. 

 A. Subgenus Bonibias. 



1. AuRicoMUS Group. 



Not certainly known to be represented in the Old World, 

 but, as the species nevadensis probably ranges through 

 Alaska, the chances seem good that the group is present in 

 Asia at least. Vorticosjis, as described and figured by Schmie- 

 deknecht (Apid. Europ., I, P. 5, 1883, p. 319, n. 11, 9 5 cf ; 

 T. 8, Fig. 7) , appears to be rather closely related to the species 

 of this group and it may really belong to it. 



2. Fraternus Group. 



Not certainly known to be represented in the Old World. 

 B. morawitzi Rad. has the male genitalia of this group, but 

 I know little about the species otherwise. B. vorticosus Ger- 

 staecker, if the figures of Radoszkowski (Bull. Soc. Natural. 

 Moscou, LIX, 1884, p. 67, F. 11) are correct, also has male 

 genitalia nearly typical of this group, but Radoszkowski de- 

 scribes nothing but the genitalia and, as figured by him, they 

 are certainly much different from those figured and described 

 by Schmiedeknecht (Apid. Europ., I, P. 5, 1883, p. 319, n. 

 11, 9 5 cf ; T. 8, Fig. 7) as those of vorticosus. 



I have examined the genitalia of the male of mastrucatus 

 Gerstaecker (the genitalia which I examined being those of 

 a male determined by Schmiedeknecht), and I found them to 

 be like those of the Fraternus Group. Furthermore, the hind 

 metatarsus of the male of that species has a good fringe of 

 long hairs on its hind border as it does in the species of this 

 group. The eyes and the ocelli, however, are, in all the 

 castes, as in the subgenus Bofnbus. Moreover, the mandi- 



