114 AMERICAN HYMENOPTERA. 



Genitalia. — Outer spatha much like that of dolichocephalus (fig. 148). 

 Inner spatha like that of fervidus (fig. 101). Claspers long, but ap- 

 parently powerful (fig. 168 and fig. 189), in general much like those 

 of the other members of the Dunwucheli group ; branches, as seen 

 from dorsal side, very broad and quadrate at apex ; squamae with inner 

 lobe rounded at end and extending mesad far beyond inner margin of 

 volsella, the outer lobe very broad and pointed at the apex on the side 

 toward the middle line of the body; volsellae very broad, with sides 

 nearly parallel throughout and with very large, prominent and curved 

 apical projections, the margins of these projections being even and 

 their apices sharply pointed. Sagittse with shafts long and curved out- 

 ward somewhat in the middle, there being a prominent projection on 

 the middle of the ventral side of each ; the heads short and foliaceous 

 and curved ventrad and laterad from the shaft. Uncus, except to- 

 ward the base, narrow and tapering gradually to the very narrow and 

 recurved apex. 



Wings, — Light, somewhat infuscate. 



Legs. — Dark like those of worker. Outer faces of hind tibiae nearly 

 flat and naked ; their front and hind fringes long, forming distinct cor- 

 biculae. Hind metatarsi with no long fringes, their outer faces dis- 

 tinctly concaved and bearing pubescence of two different lengths inter- 

 mixed, the longer hairs being sparse. 



Dimensions . — Length : queen, about 23 mm. ; worker, 16 mm. to 17 

 mm. ; male, 15 mm. Spread of wings: worker, 38 mm. ; male, 37 

 mm. Width of abdomen at second segment: worker, about 7 mm. ; 

 male, about 7 mm. 



Habitat. — It seems certain that Fabricius' early record of 

 this species from " North America " was incorrect. It does 

 not seem to be a very common species anywhere and, if 

 present in Central America, it must be very rare there. Prof. 

 Cockerell has given us an uncertain record of it from Rio 

 Nautla, Mexico. At all events, it is mainly a South Ameri- 

 can form, and we have the following apparently certain 

 records for it: Colombia, Venezuela, Peru (Pozuzo). It 

 must also be present in Ecuador. 



This species seems to have its closest allies in dahlbomii, 

 kohli and dolichocephalus. 



Boiubus (Boinbus) dahlbomii Guer. 

 Bombus Dahlbomii Guerin, Iconogr. Regn. Anim., VII, Insect., 1835, 

 p. 459, n. 1 ; T. 75, F. 3, 9 S . 

 " nigripes Haliday, Trans. Linn. Soc. Lond., XVII, 1836, p. 

 321, n.21, 9 8 . 



