186 AMERICAN HYMENOPTERA. 



miedeknecht (Apid. Europ., I, P. 5, 1883 ; T. 11, Fig. 4), 

 would place that species at once in this group, and Schmiede- 

 knecht's description of the species as a whole seems to indi- 

 cate that it is in general much like the species known to be- 

 long in this group. The figures, given by Radoszkowski 

 (Bull. Soc. Natural. Moscou, LIX, 1884, Tab. IV, figs. 36 

 a, b and c), however, as those of the male genitalia of fra- 

 grans, represent genitalia quite different from those figured 

 by Schmiedeknecht as belonging to that species. The stand- 

 ing of fragrans is, therefore, in doubt, but with the chances 

 in favor of its belonging to the Borealis group. 



5. Terrestris Group. 



Jairmairi ^\c\\q\. (From Kunawar, India). 

 portchijtski Ka.d. (From Caucasus). 

 terrestris (L.) . 



I have placed {air7nairi and portchinski in this group by the 

 descriptions and figures of their male genitalia given by 

 Radoszkowski (Bull. Soc Natural. Moscou, LIX, P. I, 1884, 

 pp. 80 and 82 ; T. 3, Figs. 31 and 33). 



6. Other Groups. 



There are several distinct Old World groups belonging to 

 the subgenus Bombus, which are not present in the New 

 World. I have been able to distinguish at least six such 

 groups, as follows : 

 (a). Hortorum Group. 



Including hortoru^n (L.) and argillaceus (Scopoli) and per- 

 haps other species. I examined the genitalia of a male 

 hortorum, determined by Schmiedeknecht, and found them to 

 be as figured by Radoszkowski and Schmiedeknecht. 

 (b). Soroeensis Group. 



Including soroeensis (F.) and radoszkowskyi D. T. (= \\ per- 

 plexes Rad.) and possibly other species. I examined the 

 genitalia of a male so7'oee?isis, determined by Schmiedeknecht, 

 and found them to be as figured by Radoszkowski and Schmie- 

 deknecht. I have never seen a specimen of radoszkowskyi, 

 but follow Radoszkowski in placing it in this group, as his 

 figures indicate that the male genitalia are much like those 

 of soroeensis. 



