138 Journal New York Entomological Society. [Voi. xii. 



Cerceris nigresceos Smith. 



9 . Highrolls, N. M., May 29 and 30, 1902 (Viereck) ; Beulah, 

 N. M., June 29, 1902 (Viereck), and Aug., 1902 (Cockerell) ; 

 Pecos, N. M. , at flowers oi Falhigia, June 23, 1903 (W. P, Cock- 

 erell). The Pecos specimen represents a variation with large yel- 

 lowish-white lateral marks on the third and fourth ventral segments of 

 abdomen. One of the Beulah specimens has small lateral dots on 

 these segments ; the others have the venter entirely black. The 

 enclosure of the metathorax is distinctly longitudinally (a little 

 obliquely) striated. Three males, which evidently belong here, are 

 from Highrolls, N. M., May 29, 1902 (Viereck), and Las Vegas, N. 

 M., at flowers of Solidago canadensis, Aug. 11 (W. P. Cockerell). 

 They have the face light yellow instead of white ; the metathorax 

 varies from all black to spotted with yellow. C. m'grescens, in New 

 Mexico, inhabits the Upper Austral, Transition and Canadian zones. 

 Cerceris acanthophila Cockerell. 



Described in Entomologist, 1897, p. 135. It inhabits the Middle 

 and Upper Austral zones in New Mexico, having been collected at 

 Deming (Cockerell), Las Cruces (Cockerell), Las Vegas (Viereck, 

 W. P. Cockerell) and White Oaks (B. Chapman). One comes from 

 Las Vegas Hot Springs (Cockerell), just in the Transition Zone. It 

 has been observed to visit Solanum el(2agnifoIiuni at Las Cruces, Petalo- 

 stenion oligophyllus at I>as Vegas. The time of flight appears to be 

 the same as that of C. nigrescens. ■ The stigma is piceous varying to 

 brown, never fulvous or ferruginous ; in nigrescens it is fulvo-ferru- 

 ginous. The enclosure of the metathorax is smooth and shining, but 

 in the females it shows some very distinct marginal punctures. 

 Cerceris finitima Cresson. 



Mesilla, N. M., at Solidago canadensis, August 15 (Cockerell); Las 

 Cruces, N. M. (Cockerell) ; Highrolls, N. M., June 14, 1902 

 (Viereck). The stigma is dark brown or piceous; the enclosure of 

 metathorax is more or less transversely striate. 

 Cerceris rufinoda Cresson. 



Las Vegas, N. M., 4 <? , i 9 , June 26, 1902 (Viereck). The en- 

 closure of metathorax is coarsely transversely ridged. In the 9 the 

 clypeus and face on each side of it are black, and the large oblong 

 lateral face marks, on each side of the antennae, are very pale yellow ; 

 the pygidial plate is broadly truncate. 



