ODYNERUS. 277 



Thorax much shagrcened ; post-seutel finely crenulate. Meta- 

 thorax forming two lateral angles, its excavation only occupying 

 the middle, rounded, strigose ; the rest shagreened, strongly 

 punctured, rounded, without sharp edges. Abdomen conical, 

 scarcely contracted at base, truncate anteriorly, but without a 

 sharp ridge, rounded at base. Second segment densely punc- 

 tured- its margin having a wide impressed band, cribrose with 

 coarse punctures; the following segments similarly cribrose. 



Black: mandibles, clypeus, forehead, and orbits, sulphur-yel- 

 low; the upper part of orbits black or brown-rufous; frontal sulci 

 black. Antennae blackish; the first segment yellowish or rufous 

 obscure above. Pronotum widely marginate with yellow ; its 

 posterior angles rufous or black; a spot and various marks under 

 the wing, tegulae, two spots on the scutel and sides of metathorax, 

 yellow. Abdomen almost wholly sulphur-yellow ; the base of 

 first segment black or brown on its anterior face, with a black 

 pyriform notch on the superior face ; the 2d having at its base a 

 black macula, constricted in the middle ; the following segments 

 twice notched with black or brown. The coarse punctures of the 

 margins having their ground-color brown. Anus ferruginous or 

 yellow. Feet yellow and ferruginous. Wings tinged with ferru- 

 ginous, cloudy at the apex. — ?. Clypeus broad, pyriform, wider 

 than long, its apex a little produced, truncate, biangulate. 



Var. The black part of the body brown or rufous. 



Probable Variety. — The yellow ornaments not so much ex- 

 tended; segments 1, 2 black, with a wide sulphur margin, widened 

 on the sides ; the 2d with two lateral triangular maculae, as in 

 0. blandus. 



Bess. a. cliff. — It has quite the form of 0. arvensis ; the meta- 

 thorax is a little more flattened, principally on the sides of the 

 excavation, which is a little narrower. It differs from 0. civgu- 

 latus in its livery ; these species are much the same in their forms. 

 — It differs from 0. pratensis by its biangulate metathorax. In 

 the livery it resembles 0. blandvs, but is very distinct by its not 

 angulate metathorax, its not crenulate post-scutel, its smaller and 

 strongly punctured first abdominal segment, its narrower clypeus 

 and its small size. 



Hab. California (? Berton). 



