ODYNERUS. 287 



of this species so common in Asia and Africa; but the clypeus 

 is always wider, the abdomen is less coarsely and more densely 

 punctured, the first abdominal segment does not offer the spot 

 trilobate with black peculiar to this species, and the border of 

 the 2d segment is more coarsely cribrose. 



Hab. The United States, from Tennessee as far as Canada. 

 Tennessee (E. Fr. Falconnet), Illinois (Walsh. Kennicott), New 

 York (E. Norton), Pennsylvania (Rathvon, Haldeman), Connec- 

 ticut (E. Norton), Wisconsin. 17 9, 20 %. 



1©3. O. leucomelas Sahss. (Fig. 19, 19a.) — Niger, punctatus,cine- 

 reo-hirtus; thorace posticeattenuato ; abdomine ovato-conico ; inetanoti 

 foveola sat planata, striata, utrinque subangulata, marginibus superis 

 tenuiter acutis, rectis, supra in denteui acutum terrninatis, a post-scu- 

 tello perfissuram sejunctnm; clypei 9 maculis 2 vel fascia, puncto fron- 

 tali et post-oculari, pronoti et abdominis segmentorum liinbo anguste, 

 post-scntello, tegulis tibiisque extns, albidis ; alis subhyalinis. — % . Cly- 

 peo bidentato, ore, antennarum scapo subtus pedibusque partiui, sul- 

 fureis. 



Odi/n. hucomelas Sauss. Et. Vespid. Ill, 225,' 131 (1854). 



o ■ Total length, 14 mm. ; wing, 10 mm. 

 % . Total length, 9 riim. ; wing, 7.5 mm. 



9 . A little larger than the 0. foraminatus, but the abdomen 

 is a little more ovate-conic, the first segment a little narrower, 

 Clypeus pyriform or rounded, strongly punctured, terminated by 

 a very little biangulate border. The whole insect finely punc- 

 tured ; thorax slightly depressed, widened in the middle, retracted 

 behind ; post-scutel finely crenulate. Truncation of metathorax 

 occupying its whole width, but the posterior plate slightly 

 concave, quite flat, in form angulate-rounded, equally striate 

 throughout, forming on each side a rounded angle, at times slightly 

 salient in the form of a tooth. Latero-superior ridges straight, 

 fine and trenchant, although very little salient, each terminated 

 superiorly by a sharp tooth, directed upward, and separated from 

 the post-scutel by a narrow fissure. Abdomen quite ovate, 

 especially among the males ; the 2d and following segments 

 quite strongly punctured on the border. 



Insect black, clothed with a grayish pile. A spot on the 



1 In the description of this species, all that whiih treats of the tborax 

 is omitted. Anotber of tbe numberless negligences of tbe printer 1 



