HENRY J. FRANKLIN. 305 



Males. — Antennas of not more than average length for 

 Bovibus male ; posterior tibiae fringed with long hairs on 

 anterior and posterior borders, forming more or less strong 

 corbiculae ; hind metatarsi with posterior fringe variable, 

 never very short and in most species rather long. 



Genitalia. — Claspers appearing rather slender and weak ; 

 the apex of each branch as seen from above broadly rounded, 

 its inner side, in most cases, more or less pointed and passing 

 the inner margin of the volsella (figs. 64, 65, 69, 72 and 74); 

 volsella long and slender, usually of about the same width 

 throughout, except at thebase, whereit is, inmost cases, rather 

 suddenly wider ; squama triangular in outline, the inner lobe 

 being vestigial or absent ; sagitta with a long, rather slender 

 shaft, having a prominent tooth-like projection on its lower 

 side at about the middle, and a sickle-shaped head, the plane 

 of the sickle being about at right angles with the shaft with 

 its tip directed ventrally. 



Bombus (Bombus) bimaculatus Cress. 

 Bombus bimaculatus Cresson, Proc. Entom. Soc. Phila., II, 1863, p. 

 92, n. 6, ^. 

 Packard, Proc. Essex Instit., IV, 1864, p. 117, cf . 

 ridin£-sii Cresson, Proc. Acad. Nat. Sc. Phila., 1878, p. 182, 



9 S. 

 bimaculatus Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 



230 (Catal.). 

 ridingsii Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 230 



(Catal.). 

 bim.aculatus Cresson, Syn. Hym. No. Amer., 1887, p. 307 



(Catal.). 

 ridingsii Cresson, Syn. Hym. No. Amer., 1887, p. 308 



(Catal.). 

 bimaculatus Dalla Torre, Cat. Hymen., X, 1896, p. 512 



(Catal.). 

 separatus Dalla Torre, Cat. Hymen., X, 1896, p. 546 (pars.) 

 (Catal.). 

 Robertson, Trans. Amer. Ent. Soc, XXIX, 1903, 

 pp. 177 and 178, 9 c?. 

 bimaculatus Howard, Insect Book, 1904, Plate II, fig. 4, cJ', 



fig. 8, 9 . 

 ridingsii Swenk, Ent. News, XVIII, July, 1907, p. 296, n. 5. 



TRANS. AM. BNT. SOC, XXXVIII. (39) 



