strong. Front and vertex closely strongly punctured. Base of thorax trans- 

 verse, the sides angled but not jjrojeeting. The thorax strongly coarsely 

 punctured, the propleurae stoutly striated; mesopleurae more or 

 less reticulated; the mctapleurae in the center with fine curved striae; 

 stronger and more curved above, the sides rough, not keeled and stout- 

 ly spined in the middle. Basal slope of first abdominal segment steep, 

 punctured, the rest smooth; the second and following segments closely 

 punctured, more coarsely at the apex than elsewhere; the apex of the 

 second segment smooth and sharply curved upwards. Apex of post- 

 scutellum with a vertical slope, vsmooth, serrate above. 



The base of the first abdominal segment is more transverse, not so 

 rounded as it is typical Odynerus, it- showing an approach to Ancis- 

 troceriis. 



3948 Odynerus cytainus sp. nov. 



Black; the clypeus except for a black mark in the center, the mark 

 obliquely narrowed at the apex, the longer and wider basal part narrowe'd 

 above and with a short pedicel there, a small mark over the antennae, 

 roundly narrowed above, more longly and obliquely narrowed below, 

 two lines on the outer orbits, the upper the longer and thicker, basal 

 half of mandibles, underside of antennal scape, the pronotum, two 

 short lines on the mesonotum, two marks on the scutellum narrowed on 

 the inner side, the greater part of the postscutellum, a large mark, 

 broad above, incised on the inner side, on the sides of the metanotum, 

 tegulae, except for a brown mark in the center, an irregular mark lon- 

 ger than wide below the tubercles, an oblique irregular smaller mark 

 below its apex, the legs except the coxae and trochanters, and the 

 abdomen except for the following black marks: the basal slope, a 

 transverse broad mark united to it by a short pedicel, the mark trans- 

 versely roundly incised behind; a broad band, roundly narrowed (but not 

 m.ueh) at the apex united by a short pedicel to a broad transverse 

 band which does not, like the basal one, reach the sides, roundly 

 narrowed behind, transverse at the apex; the basal ventral segment, 

 the base of the second and an irregular transverse mark in its center. 

 Wings hyaline, the apex slightly smoky ; the costa and basal nervures 

 testaceous, the rest blackish. Female. Length to end of second segment 

 8-9 mm. Claremont, California. 



Front and vertex closely and strongly punctured, more strongly and 

 less closely above than below and covered with longish pubescence. 

 Clypeus as long as its greatest width, pyriforni, its apex slightly 

 roundly incised, the lateral angles blunt; the punctuation strong, not 

 very close. Thorax longer than usual, nearly three times longer than 

 wide, the base transverse, the sides not angled; the punctuation is close 

 and moderately strong the upper part of the metanotum is, above, finely, 

 closely, obliquely striated; its upper sides are stoutly keeled, the keel 

 ending shortly below the middle in a stout tooth. First abdominal 



