262 HYMENOPTERA OF AMERICA. [PART 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 pro-thorax continued in a narrow line to the tegulas, 

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

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

 tinged 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 fine transverse stria?, 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 celh dusky; nervures honey- 

 yellow. 



Bab. Cuba. 



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

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

 safely decide it, nor make one description answ T er for both. 



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

 so salient. 



* The superior ridges forming two elevated spines behind thepost-scutel. 



ST. O. SClltellaris Sauss. — Niger, thorace valde punctato, postice 

 atteuuato; post-scutello acute truncato ; rnetanoti facie postica planata, 

 valde angulata, utrinque dentata, cantbis recti's marginata, supra pone 

 post-scutellum bispinosa ; abdomine gracili, puuetato ; primo segniento 

 basi truncato; segmentis sequentibus margine fortius pnnctato ; macula 

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

 margine, post-scutello, rnetanoti dentulis, abrtominisque segmentorum 

 l'-4' margine pedibnsqne, flavis ; alis fosco-ferrngineis, nebulosis. 



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



Odyn. scatellaris Sauss. Rev. et Mag. de Zool. XXII, 1S70, 58, 11, %. 

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



