216 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



insects. On the other hand, the pubescence of the Old World Osmise 

 is often very brightly colored, 0. ferruginea and 0. pseudoaurulenta 

 from North Africa being covered with deep-red hair. The European 

 species not rarely have red hair on the abdomen, while in the Ameri- 

 can, if there is such hair, it is on the thorax, or mainly so (see 0. novo- 

 mexicana, 0. cerasi). 



A species of Osmia, agreeing with the description of 0. texana 

 Cresson, was taken by Prof. C. H. T. Townsend on the Kio Nautla, 

 State of Vera Cruz, in the tropical part of Mexico. 



SUBGENERA AND SECTIONS. 



Centrosmia Robertson. 



Type. — bucephala. Also includes tarsata. 

 Xanthosmia Robertson. 



Type. — cordata. Mandibles of female quadridentate. 

 Gnathosmia Robertson. 



Type. — georgica. Mandibles of female with a large basal tooth. 

 Monilosmia Robertson. 



Type. — canadensis. Also includes chlorops. Male fiagellum moniliform. 

 Diceratosmia Robertson. 



Type. — quadridentata. This and Nothosmia have tridentate mandibles in the female. 

 Leucosmia Robertson. 



Type. — albiventris. Also includes nigritula. 



The above six, and also Ceratosmia, are defined in Trans. Amer. Ent. Soc, 1903, 

 pp. 165-166. 

 Nothosmia Ashmead. 



Type. — distincta. Also includes exigua, according to Titus. 

 Acanthosmioides Ashmead. 



Type. — odontogaster. 



For the above two see Trans. Amer. Ent. Soc, 1899, pp. 75-76. 

 Melanosmia Schmiedeknecht 1884. To this group Titus has referred 0. grandior. 



TABLES. 



(1) Cockerell, University of Colorado Studies, vol. 4, 1907, pp. 250-253. 



(2) Cockerell, Bull. Amer. Mus. Nat. Hist., vol. 22, 1906, pp. 446-447. 



(3) Cockerell, Ann. and Mag. Nat. Hist., Aug. 1907, p. 123. (Bright green males.) 



(4) Robertson, Trans. Amer. Ent. Soc, vol. 29, 1903, pp. 165-166, 170-171. (Species 

 of Illinois.) 



(5) Cockerell, Proc. Acad. Nat. Sci. Phila., 1897, pp. 346-347. (Females resembling 

 0. densa.) 



(6) Cockerell, Bull. Sci. Lab. Denison Univ., vol. 11, 1898, p. 63. (Species of New 

 Mexico.) 



(7) Cockerell, Canadian Entomologist, April, 1909, p. 131. (Males with small joints 

 of middle tarsi thickened.) 



(8) Cockerell, Entomological News, June, 1910, p. 273. (Females of medium size, of 

 a deep blue or purplish color, with the hair either all black or black with a slight 

 admixture, easily overlooked, of light.) 



