CAMERON, SOME ODYNERINAE OF THE SOUTHWESTERN UNITED STATES 123 



former is omitted by Mr. Cresson in his Catalogue (Trans. .Ajn. Ent. Supp. 

 1887, 288), while ornatus he refers to Odynerus. As the species are very 

 easily recognized, Lcptochilus might as well be adopted as a generic group. 



Pterochilus bakeri n. sp. 



Black, the clypeus except a small irregular spot in the center ; mandibles 

 except apex, a narrow line on the lower edge of the eye incision, a broader one 

 obliquely narrowed below on the outer orbits, the upper part of the thorax to 

 near the apex, where it is broad and incised, tegulae, two large marks on the 

 scutellum, postscutellum, the sides of metanotum broadly, the marks not reach- 

 ing to the lower edge, a squarish mark on the base of the mesopleurae rounded 

 below and reaching beyond the middle, a similar but longer mark immediately 

 below it, and the abdomen for the greater part, lemon yellow ; the basal slope 

 of the first abdominal segment the mark continued beyond as a narrower 

 rounded projection, a larger similar mark on the seconrl, narrow rounded 

 bands on the base of the second to fifth, and the basal half of the sixth all 

 around, black. Legs of a paler yellow, the coxae behind, the hind femora to 

 near the apex, the four anterior femora at the base all around, more broadly 

 behind, and the intermediate to beyond the middle, black. Antennal scape 

 yellow, black above, the flagellum black, reddish brown below. Wings hyaline, 

 .suflfused with fulvous, the apex slightly violaceous, the costa and stigma ful- 

 vous. Female — Length 9 mm. Claremoiit, California. (Baker.) 



Clypeus as broad as long, sparsely punctured, the apex somewhat broad, 

 transverse, margined. Head and thorax closely but not strongly punctured. 

 Base of thorax transverse, the sides slightly but distinctly bluntly projecting, 

 the sides at the apex broadly rounded, apical half of mesonotum with a longi- 

 tudinal furrow bordering the middle. Abdomen closely coarsely punctured, 

 the second segment square, the base of the second ventral segment has a band, 

 which bifurcates at the outer edges the outer fork the larger. 



The apex of the clypeus is broader than it is in luteicoUis Cam. ; in that 

 species the lower mark on the mesopleurae is narrower, more irregular and 

 obliquely sloped, there is a yellow mark on the metapleurae, and the marks 

 on the basal two abdominal segments are differently shaped, c. g., they are in- 

 cised in the middle. 



Symniorphus hornii n. sp. 



Black, a small, semi-circular mark on the top of the clypeus, a small one 

 over the antennae, a triangular spot on the sides of the pronotum slightly 

 longer than that on the clypeus, two spots wider than long, and narrowed on 

 the inner side on the scutellum, an irregular spot narrowed below under the 

 tegulae, a line of uniform width on the apices of the first and second abdominal 

 segments, a narrow interrupted one on the middle of the third, a broader one 

 (not much narrower than those on the basal segments) on the fourth, and an 

 irregular line curved and laterally dilated, on the underside of the third, pale 

 whitish yellow. Tibiae, except at the apex, testaceous. Wings, hyaline, suf- 

 fused with violaceous, the base tinged with dark testaceous, the stigma and 

 nervures black. Female — Length 10 mm. Gunnison, Colorado. (Baker.) 



