2G2 HYMENOPTERA OF AMERICA. [rART I. 



as the thorax, terminating in a hook, black, tinged with ferrugi- 

 nous at base and tips, scape yellowish beneath. Thorax dull 

 blackish, densely punctured, slightly pubescent; broad anterior 

 margin of prothorax continued in a narrow line to the tegulaa, 

 sometimes interrupted, a large spot beneath the tegulae, scutellum, 

 except its apical margin, and post-scutellum, yellowish, sometimes 

 i with ferruginous ; pleura slightly sericeous in certain lights, 

 with an oblique dull yellowish stain on each side beneath; meta- 

 thorax mostly yellowish, the extreme sides spotted or stained with 

 fuscous, the posterior face deeply and broadly excavated, covered 

 with One transverse striae, more or less distinct, and with a large 

 blackish mark, covering the disk and spreading out on each side 

 at base; lateral angles prominent and obtuse; tegulae yellowish, 

 with a ferruginous spot on the middle. Abdomen shaped and 

 marked as in the preceding species, but the general color fuscous, 

 with the third and sometimes the first segments, except their 

 apical margins, blackish, and the spot on the terminal .segment 

 above, scarcely defined. 



Legs yellow, the femora tinged with ferruginous above. Wings 

 yellowish-hyaline, more deeply yellowish along the costa; the 

 apex, especially about the marginal cell, dusky; nervures honey- 

 yellow. 



Hob. Cuba. 



This is most probably the male of 0. proctus, as E. T. Cresson 

 supposes. But not having the insects before my eyes, I cannot 

 safely decide it, nor make one description answer for both. 



b. The hinder face of metathorax more flattened; its superior edyes not 

 so salient. 



* The superior ridges forming two elevated spines behind the post-scntel. 



8?. O. SCUtellaris Sacs?.— Niger, tborace val<le punetato, postice 

 attenuate; post-scutello acute trumato ; metanoti facie postica planata, 

 valde angulata, utrinque dentata, cantlns rectis marginata, supra pone 

 post-scutellum bispinosa; abdourine gracili, pnnotato; primo segmento 

 basi tnmcato; segmentis sequentibus margine fortius punetato ; macula 

 frontali, post-oculari, pronoti margine, tegulis, macula snbalari, scuteili 

 margine, post-scutello, metanoti dentulis, abdominisqne segmentorum 

 l'-4' margine pedibusque, flavis ; alis fusco-ferrugineis, nebulosis. 



% . Clypeo ovato-elongato, flavo, apice breviter bidentato. 



Odyn. scutellaris Sauss. Rev. et Mag. de Zool. XXII, 1870, 58, 11, $. 

 Total length, 11 mm. ; wing, 8 mm. 



