EUMENES. 71 



black, varied with ferruginous; tarsi and tibiae 1st, 2d, brown or 

 ferruginous. Wings transparent, smoky ; brown along the ante- 

 rior margin; the brown extending as far as the end of the radial 

 cell. Stigma very large, black, often opaque, surrounded by a 

 transparent zone. First discoidal cell almost rectangular; third 

 cubital wider than long ; the second small. 



% . Thirteenth article of the antennas very variable, sometimes 

 rudimentary, not forming a hook, but only a little tubercle, some- 

 times forming a very small black hook ; sometimes more elongate, 

 ferruginous. Sometimes the antennae are simple, as in the females. 

 Clypeus as in the 9, hardly emarginate, shining, black; its infe- 

 rior extremity only presenting two small approaching projections, 

 or a little parted by a channel; black, as in the 9, or with two 

 yellow dots near the summit. 



Var. a. Markings of the thorax often ferruginous and the little 

 process situated behind the wing scale, not yellow ; the yellow 

 fasciae of the last segments of the abdomen dull, sometimes fer- 

 ruginous. 



b. Head entirely black. Scutel scarcely marked with yellow. 



c. The scape of the antennae ferruginous, obscure above. 



d. Wing scale ferruginous. 



e. Petiole quite black. 



f. The yellow ornaments changing into ferruginous. 



g. Metathorax quite black. 



h. No yellow fascia before the tegulae on the sides. 



Common varieties. — A. The 2d segment a little shorter; its 

 margin a little more concave. Hinder margin of prothorax 

 honey-yellow or fulvous; scutel and post-scutel dull rufous, meso- 

 pleurae dull rufous. (10 9,2 % .) 



Var. Scutel rufous, post-scutel yellow. I cannot consider this 

 as a different species. 



B. Prothorax quite black, with the hinder margin yellow; 

 scutel black ; post-tegulae and post-scutel yellow ; two yellow 

 dots on top of metathorax, or two lines on its angles. 



Bests, a. diff. — Differs from the E. microscopicus (its near 

 neighbor) by the arrangement of the ocelli, which do not form a 

 triangle, but only an arcuate line. 



It is distinguished from E. Mex.icanus by its small size; by its 

 yet shorter thorax, more analogous to that of the E. globicollis ; 

 by its abdomen, longer and smaller in proportion; by its clypeus 



