56 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



distinguished by the character of the segments of the flagelhim as 

 Handlirsch has pointed out in his description of this species. The 

 females of dentlcornis and sunnamensis are almost identical. Hand- 

 lirsch separated them from one another by the character of the ridge 

 or boundary that divides the dorsal area from the ventral area of 

 the clypeus, this boundary line being distinct and angular on 

 surinameTisis and indistinct and rounded on denticornis. It is a 

 character difficult to use and of doubtful value, but I have been 

 unable to discover anj^thing better. 



SPECIMENS EXAMINED 



Ecuador: Pasorja. 



Mexico: Escuinapa, Siualoa (J. H. Batty) ; Alta Mira, Tampa (June 22, 1903). 

 Peru: Lima (E. A. Martinez — Det. Rohwer) ; Lima (December 27, 1912, 

 C. H. T. Townsend) ; Piura (April 28, 1911). 



Genus BEMBIX Fabricius 



Figures 27, 28 



Apis Linnaeus, Syst. Nat., ed. 10, vol. 1, 1758, p. 574. 



Bcmhia; Fabricius. Syst. Ent.. Char. Gen., 1775, No. 115. — Parker, Proc. U. S. 



Nat. Mus., vol. 52, 1917, p. 75. 

 Bembyx Fabricius, Syst. Ent., 1775, p. 361, No. 115. 

 Bemhex Fabricius, Gen. Insect, 1776 (or 1777), p. 122. — Olivier, Encycl. Meth., 



vol. 4, 1789, p. 288.— Fabricius, Ent. Syst., vol. 2, 1793, p. 247.— LATREaxxB, 



G€ii. Crust, et Ins., vol. 4, 1809, p. 97. — Handlirsch, Sitz. Akad. Wissensch. 



Wien, Math.-Nat. CI., vol. 102, 1893. p. G63.— Kohl, Ann. K. K. Naturhist. 



Hofiuua, vol. 11, 1896, p. 430.— Dalla Torre. Cat. Hym., vol. 8. 1897, p. 501. 

 Monedula Dahlbom, Hym. Eur., vol. 1, 1845, p. 492. 



Genotype. — Ajns rostrata Linnaeus, designated by Latreille in 

 1810; Morice and Durant (1915) concur in the designation. 



Members of this genus are world-wide in distribution. They may 

 be distinguished by the following combination of characters: An- 

 terior ocellus reduced to a linear, transverse, arcuate cicatrice (traces 

 of a lens present in a few species) ; posterior-lateral angles of the 

 propodeum rounded, its posterior surface approximately flat; maxil- 

 lary palpus composed of four segments, labial of two; first inter- 

 cubitus more or less strongly bent. 



Head wide as or slightly wider than the thorax ; vertex depressed 

 but slightly below the level of the top of the eyes; anterior ocellus 

 (except in a few species) completely reduced to a linear, transverse, 

 arcuate cicatrice; eyes naked; clypeus moderately arched, a broad, 

 shallow median emargination on its apical border which is produced 

 into a distinct point between the labrum and the base of the man- 

 dible; mandibles dentate; maxillary palpus composed of four seg- 

 ments, labial of two (on some individuals of certain species the 

 number of segments in the palpi may vary) ; posterior-lateral angles 



