246 PROCEEDINOS OF THE NATIONAL MUSEUM. tou 53. 



punctures; superior interocular line nearly half as long as the in- 

 ferior and subequal Avith the second, third, and fourth antenhal 

 joints; antennae filiform, the third joint one-fourth shorter than 

 the fourth; mesoscutum punctured similar to the vertex; dorsal 

 aspect of the propodeum coarsely coriaceous, the sides finely striate, 

 the posterior face more strongly striate; second abcissa of radius 

 longer than first or third ; pygidium sharply narrowing, the carinae 

 almost obsolete, length and basal (base of carinae) width subequal. 

 Black; first two and last tergites piceous; wings dusky hyaline; 

 pubescence sparse and silvery. 



Type-locality. — Tahoe, Eldorado County, California. Described 

 from two females collected at an altitude of 6,200 feet June, 1909, by 

 W. M. Giffard. 



Ti/pe.— Cat. No. 19950, U.S.N.M. 



Paratype in Mr. Giffard's collection. 



TRYPOXYLON FRIGIDUM Smith. 



One male from Piedmont or Oakland, California, collected Octo- 

 ber, 1910. 



TRYPOXYLON ARIZONENSE Fox. 



One female collected by Blaisdell, in Calaveras County, California, 

 July, 1910. 



CERATOPHORUS TENAX (Fox), 



Two females and four males from Piedmont and Oakland, Cali- 

 fornia, collected September, 1910. Four females and six males from 

 Alameda County, California, collected July, 1907. 



PEMPHREDON NEARCTICUS Kohl. 



A single female from Tahoe, Eldorado County, June, 1909, eleva- 

 tion 6,200 feet. 



CEMONUS GIFFARDI. new epccieg. 



In Fox's table ^ this species will run to tenax, but the clypeus and 

 propodeum readily separate the two species. 



Female. — Length, 7.5 mm. Anterior margin of the clypeus with 

 a broad median projection, the apex of wiiich is shallowly arcutely 

 bemarginate, so there are three small teeth; front rather sparsely 

 punctures with a tendency to striato-punctation above the anten- 

 nae; vertex and posterior orbits shining, sparsely punctured; 

 antennae nearly filiform, the third joint slightly longer than the 

 fourth; mesoscutum and scutellum polished with a very few dis- 

 tinct punctures; mesepisterum coarsely coriaceous to striate; sides 

 of the propodeum striato-reticulate, dorsad-ventrad; dorsal aspect 



» Trans. Amer. Ent. Soc, vol. 19, 1S92, p. 308. 



