AMERICAN hymknoptp:ra. 207 



upper, outer face of the nietanotum is an oblique keel. The fuscous 

 pubescence on the head is denser and longer than it is on the thorax. 

 Apical slope of inetanotuni ratlier strongly punctured. 



'^-'^Odynerus «Mlwai'<l«>»ii sp. nov. 



Black; the clypeiis, except for a small conical mark (the narrowed end above), 

 shortly over the middle, a small triangular mark near the base of tlie mandibles, 

 a small irregular mark, wider than long, over the antennie, au irregular spot at 

 the outer side of the antenuse, a short line near the top of the outer orbits, a line 

 on the basal third of the pronotnm. narrowed in the middle, two broad marks, 

 narrowed on the innerside and divided by a furrow on the scutellum. a broad 

 curved mark on the sides of the metanotum. postscutellum, a large conical niaik 

 on the mesopleurse below the tegulae, a minute one below it, the sides of the first 

 abdominal segment, its apex more narrowly, the black central mark at the apex 

 ])rojecting laterally, the lateral projections shorter than the central part and 

 slightly narrowed outwardly, the basal fourth of the second segment, its apex in 

 the centre projecting, uniting it with a broader, more irregular transverse band 

 which does not extend to the sides, narrower bands on the base of the third and 

 fourth, narrowed slightly at the sides, a band on the fifth broadly dilated on the 

 outer third ; the sixth, except for a broad, oval spot on the apical third, the sec- 

 ond ventral, except nal-rowly at the base, and for an oblique line projecting from 

 its sides, straight on the inner, rounded on the outer in the centre, the sides 

 broadly roundly dilated, the apices of the fourth and fifth broadly, deeply in the 

 centre, narrowly laterally, lemon-yellow. Legs yellow, the base and upper sides 

 of the fourth anterior coxse, their trochanters, the fore femora broadly, the mid- 

 dle more narrowly at the base, both more broadly above than below, the hind 

 coxaj, trochanters, basal three-fourths of their femora black; the tarsi tinged 

 with fulvous; the hind coxse with a short thick tooth in the middle behind ; the 

 four hinder tibise marked with black on the innerside behind. Underside of 

 antennal scape yellow. Wings hyaline, tinged with fulvous, the stigma testa- 

 ceous. 9- Total length 8 mm. 



Head and thorax densely covered with long fuscous hair. Clypeus as wide as 

 long, the sides and apex narrowly black, the latter narrowly depressed, transverse. 

 Base of thorax transverse, the sides not projecting. Head not much wider than 

 thorax. Apex of postscutellum transverse. Base of first abdominal segment with- 

 out a distinct keel, but still margined ; the second shorter than it is wide at the 

 apex, which is flat. The sides of the metanotum are indistinctly keeled above. 



Mountains near Clareinont, California (Baker). 



Is not unlike A. rivularis Cam. and fulvitarsL<i Cam. in coloration, 

 but is smaller than the latter, which has not tlie apex of the black 

 l)and on first abdominal segment dilated laterally, and the clypeus 

 has broad lateral marks; rivnlans has only a small square mark at 

 the end of the black on the first abdominal segment; this is also 

 the case with fulvitarsis, which has also broad side-marks on the 

 clypeus, and the base and apex of the mark on the second are not 

 united by a pedicle. 



TRANS. AM. ENT. SOC XXXIV. JULY, 1908. 



