522 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



Male. — Differs from female principally as follows: Ocelli distinctly 

 greater than ocell-ocular line; second recurrent distinctly postf ureal ; 

 hind legs, especially tibiae, stouter, postpetiole much narrower and 

 parallel-sided; petiole with weak dorso-lateral carinae; testaceous 

 color of thorax, and to some extent that of abdomen, replaced by yel- 

 low; prescutal spot more nearly uniformly brownish; all tergites 

 more or less brownish at base. 



A single paratype male differs from the allotype in having the 

 stigma narrower with radius nearly in middle, second recurrent 

 strongly postfurcal, and all tergites beyond third entirely yellow. 



Type-locality. — Grand Junction, Colorado. 



Other locality. — Port Lavaca, Texas (allotype). 



Type.— Cat. No. 20258, U.S.N.M. 



Described from one female reared June 2, 1904, from Pvlvinaria 

 higeloviae by E. S. G. Titus at the typo locality and two males, the 

 allotype collected August 27, 1907, by J. D. Mitchell. The allotype 

 has lost both antennae. 



CREMASTUS (CREMASTUS) GRACILIVENTRIS, new species. 



Female. — ^Length 9 mm., antennae 6 mm., ovipositor 3 mm. Re- 

 lated to Jlaviceps Cushman in the entire lack of carinae on the petiole 

 and in the parallel eyes, but otherwise differing as follows: Temples 

 nearly flat; eyes distinctly longer than width of face; foveo-ocular 

 line about two-thirds as long as interfoveal line; clypeus slightly 

 longer, subacutely rounded at apex; malar space slightly less than 

 basal width of mandibles; lateral ocellar, postocellar, and ocell- 

 ocular lines 1:2:1.5, ocelli I. Thorax more slender, propodeum less 

 steeply sloping, and reaching beyond middle of coxae; mcsoscutum 

 nearly uniformly, sparcely punctate; scutcllum rather flat above, 

 carinae strong; thorax laterally densely strongly punctate, the longitu- 

 dinal impression finely rugulose ; propodeal carinae rather strong, all 

 areas except basal areas more or less transversely rugulose, median 

 most strongly and pleural least strongly so, the latter also punctate as 

 are the basal areas, the combined areola and petiolar area more than 

 four times as long as wide at costulae; hind basitarsus about three- 

 fifths as long as tibia and fully as long as next three joints; stigma 

 about one-third as wide as long, radius at middle; second recurrent 

 distinctly postfurcal; basal vein rather strongly bent inward; veins 

 of hind wing stronger. Abdomen twice as long as head and thorax; 

 first tergite not distinctly longer than second; second tergite some- 

 what more than four times as long as basal width, not much wider at 

 apex; ovipositor considerably more than one and one-half times as 

 long as first tergite, though less than twice as long. 



Testaceous; head testaceous with mouthparts and orbits yellow, 

 oceUar triangle and small occipital spot blackish; antennae piceous, 

 paler toward base, scape beneath yellowish; thorax nearly uniform 



