HENRY J. FRANKLIN. 399 



2. Similarity of appearance. — These males resemble the females of 

 californicus very closely in coloration and they vary in coloration in a 

 corresponding manner. No other males known to me do this. 



3. Coordination of structure. — The females are structurally the same 

 as the females of B.fervidus, and these males are structurally the same 

 as the males oifervidus. 



4. Concordance of habitat. — These females and males are found rang- 

 ing through the same habitat and in corresponding numbers in the 

 different portions of it. 



Bonibns (Bonibus) pennsylvanicus Geer. 



Apis pennsylvanica De Geer, Mem. Hist. Insects, III, 1773, p. 575, n. 

 8; T. 28, F. 12. 

 " americanorum Fabricius, Syst. Entom., 1775, p. 380, n. 12. 

 " pennsylvanica Goze, De Geer: Abh. Gesch. Insect., Ill, 1780, p. 



372, n. 8; T. 28, F. 12. 

 *' americanorum Fabricius, Spec. Insect., I, 1781, p. 477, n. 13. 

 " pennsylvanica Retzius, Gen. and Spec. Insect., 1783, p. 61, n. 218. 

 ? " americanorum Fabricius, Mant. Insect., I, 1787, p. 300, n. 14 

 (probably not a Bombus) . 

 " " Olivier, Encycl. Method. Insect., IV, 1789, p. 66. 



n. 25. 

 Gmelin, Linne : Syst. Nat., Ed. 13% 1-5, 1790, p. 

 2784, n. 116 (pars.). 

 " " Christ, Naturg. d. Insect., 1791, p. 126. 



Fabricius, Entom. Syst., II, 1793, p. 319, n. 18. 

 " nidulans Fabricius, Suppl. Entom. System., 1798, p. 274, n. 33-34. 

 Bombus americanorum Fabricius, Syst. Piez., 1804, p. 346, n. 16. 

 nidulans Fabricius, Syst. Piez., 1804, p. 349, n. 35. 

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



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



n. 52, 9. 

 Bremus " Jurine, Nouv. Meth. Class. Hymen., I, 1807, 



p. 260, 9 . 

 Centris " Lepeletier, Encycl. Method. Insect., X, 1825, 



p. 795. 

 Bombus " Harris, Catal. Insect. Mass., 1835, p. 70. 



(Catal.). 

 Lepeletier, Hist. Nat. Insect., Hymen., I, 



1836, p. 472, n. 22, 9 . 

 Greene, Ann. Lye. Nat. Hist. New York, VII, 

 1860, p. 172, n. 9, 9 . 

 " pallidus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 92, n. 8, 

 9. 



TRANS. AM. ENT. SOC, XXXVIII. 



