474 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



The above-mentioned female taken by Cockerell at the nest of 

 Anthophora occidentalis at Boulder, Colo., has the apex of the mandibles 

 broadlj?^ romided with only very slight indications of apical teeth. 

 Otherwise it does not differ materially from other specimens of the 

 species and it is believed that the mandibles are simply worn. 



9. MONODONTOMERUS MANDIBULARIS, new species 



Monodontomerus montivagus Rau (not Ashmead), Trans. Acad. Sci. St. Louip, 



vol. 24, p. 35, 1922. 

 Monodontomerus sp. Frisox, Trans. Amer. Ent. Soc, vol. 48, p. 154, 1922. 

 Monodontomerus sp. Rati, Trans. Acad. Sci. St. Louis, vol. 25, p. 222, 1926. 



This species is difficult to distinguish from montivagus except by 

 the mandibles, which in mandibularis are bidentate with the ventral 

 tooth long and acute, the inner tooth small and located far basad of 

 the apex of the ventral tooth so that its apex is approximately at the 

 basal two-thirds of the mandible. The antennae are inserted only 

 very slightly above a line comiecting the lower extremities of the eyes 

 and the distance from the base of the antennae to the anterior margin 

 of the clypeus is only slightly more than half the distance from the 

 lower margin of the antennal fossae to the lower margin of the an- 

 terior ocellus. The ocellocular line is distinctly a little longer than 

 the diameter of a lateral ocellus. 



The above characters hold for both sexes and are apparently the 

 only ones by which mandibularis can be separated from montivagus. 

 The size, color, and length of ovipositor are well within the range of 

 variation stated in the foregoing description of montivagus. The 

 scapes of the males are alike for the two species. 



Type locality.— St. Louis, Mo. 



Type. —V.S.'N.M. No. 54265. 



Described from the following specimens: 4 females (including the 

 holotype) and 4 males (including the allotype), reared by P. Eau^from 

 Anthophora abrupta Say, May 13, 1910, at St. Louis, Mo.; 1 female 

 and 3 males, St. Louis, Mo., P. Rau, No. 4181, host and date of col- 

 lection unknown; 4 females reared from Anthophora abrupta, Oak- 

 wood, 111., June 9, 1919, T. H. Frison, Exp. D; 1 female and 1 male, 

 reared from A. abrupta, Henry County, Ohio, 1931, W. E. Dmiham; 

 46 females and 10 males, under Bur. Ent. No. 862P°^ reared from 

 Anthophora abrupta Say in the vincinity of Washmgton, D. C, and 

 bearing the respective dates November 17, 1877, May, July, and Nov- 

 ember 1878; 5 females from Bayou Sara, La., E. A. Schwarz collector, 

 January 23, 1879, also under Bur. Ent. No. 862P°^ (specimens badly 

 broken); 10 females and 1 male reared from Melitoma taurea (Say) at 

 Washington, D. C, March 10, 1879, under Bur. Ent. No. 50X; 5 

 females reared from Anthophora bomboides Kirby at Ithaca, N. Y., 

 April 8, 1912, and April 12, 1921, R. C. Shannon; and 1 female from 



