HENRY J. FRANKLIN. 123 



of corbiculse. Hind metatarsi with outer faces distinctly concaved ; 

 with no long fringes. 



Dimensions. — Length, about 19 mm. ; spread of wings, about 38 

 mm. 



This species is most closely related to medms, but appears 

 to be distinct from it. B. atratus is certainly quite distinct 

 from both and is possibly the male of niger. Incaru7n is also 

 quite distinct from all these forms. Mexicanus is certainly 

 distinct from ptdlatus. The volsellae of the genitalia of pid- 

 latus have much wider apices and more hook-like apical pro- 

 jections than do those of mexicanus, and the squamae of pul- 

 latus have the outer lobe well developed and prominent while 

 those of mexicamis do not. 



Boinbus (Bombiis) medius Cress. 



Apis cajennensis Fabricius, Suppl. Ent. Syst., 1798, p. 273, n. 13-14. 



Bombus cajennensis Fabricius, Syst. Piez., 1804, p. 345, n. 13. 



? " " Illiger, Magaz. f. Insectenk., V, 1806, p. 172. 



? Brenius " Jurine, Nouv. meth. class. Hym., 1807, p. 259, 9. 



? Bombus " Lepeletier, Hist. Nat. Insect. Hymen., I, 1836, 



p. 471, n. 20, 9 a d^. 

 ? " " Spinola, Mem. Accad.Sc. Torino, (2), XIII, 1853, 



p. 92, n. 73. 

 ? " cayennensis Smith, Cat. Hym. Brit. Mus., II, 1854, p. 401, 

 n. 63. 

 " medius Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 97, n. 17^ 

 8 . 

 ? " cayennensis Holmberg, Anal. Soc. Cient. Argent., VIII, 



1879, p. 160, n. 3, 9 S cf . 

 ? " unifasciatus Smith, Descr. New Spec. Hym., 1879, p. 133, 

 n. 8, 9 S c?. 

 " medius Cresson, Trans. Araer. Ent. Soc, VII, 1879, p. 230 

 (Catal.). 

 ? " cayennensis Ant. Handlirsch, Ann. naturh. Hofmus. Wien., 



Ill, 1888, p. 240, 9 S d^— var. a. 

 ? " " var. Mexicamis Ant. Handlirsch, Ann. Naturh. 



Hofmus. Wien., Ill, 1888, p. 241, 9 8 . 

 ? " " Dalla Torre, Cat. Hym., X, 1896, p. 513. 



medius Dalla Torre, Cat. Hym., X, 1896, p. 533. 

 ? " cayennensis Cockerell, Cat. Abej. de Mexico, 1899, p. 19 

 (Catal.). 

 " medius Cockerell, Psyche, XII, 1905, p. 90. 



Types. — It is, of course, doubtful whether Fabricius' speci- 



TRANS. AM. ENT. SOC, XXXIX. 



