80 HYMENOPTERA. 



wings, the anterior and posterior margins of the tegulse, a spot 

 behind them, the post-scutellum and the lateral margins of the 

 metathorax, a spot at the apex of the anterior femora behind, 

 and the anterior and intermediate tibiae outside, white ; the 

 metathorax truncate, slightly concave, with a central impressed 

 line, on each side of which it is obliquely striated ; the wings 

 hyaline, with their margins clouded. The first and second seg- 

 ments of the abdomen with white fasciae on their apical margins, 

 that on the second continued beneath. 



Hob. St. Domingo. 



Div. VI. Species of North America (Mexico, Carolina, Arctic 

 America, Canada, fyc.}. 



201. ODYNERUS TUBERCULICEPS. 



Odynerus tuberculocephalus, Sauss. Mon. Guepes Sol. 139. 22. 

 Odynerus tuberculiceps, Sauss. Mon. Guepes Sol. Supp. 205. 139, 

 f. 16. f. 9. 



Hob. Mexico. 



202. ODYNERUS SIMILIS. B.M. 



Female. Length 4^ lines. Black : covered with ochraceous 

 pubescence, and having also a clothing of changeable pale golden 

 pile, that on the abdomen very brilliant in some positions ; the 

 clypeus truncate at the apex, the lateral angles acute, sub- 

 dentate ; a yellow spot between the antennae and another at the 

 apex of the clypeus. The thorax slightly narrowed anteriorly 

 and posteriorly ; the anterior margin of the prothorax not raised 

 or sharply truncate ; the metathorax rounded at the sides and 

 truncate posteriorly and slightly concave ; the wings hyaline, the 

 anterior margin of the superior pair yellowish, the nervures fer- 

 ruginous. Abdomen : the first segment much narrower than the 

 second, strongly punctured, its apical margin marginate ; the 

 apical margin of the second and three following segments with a 

 broad yellow fascia; the apical segment yellow with a black spot 

 in the middle of its base ; the fasciae on the segments continued 

 beneath. 

 Hab. Mexico. 



This species closely resembles Odynerus brevithorax, but the 

 thorax is not quadrate as in that insect, the metathorax is not 

 widely truncate, nor is the post-scutellum produced at its apical 

 margin : the form and sculpture of the basal segment are very 

 different. 



