EUMENES. 73 



fascia ; those following with a piceous border. Tibia; and tarsi 

 more or less ferruginous. Wings cloudy, the 2d recurrent nerve 

 quite interstitial, or even falling a little into the third cubital 

 cell. 



% . Hook of the antennas very small. 



Var. a. Metathorax without yellow fascia;. 



b. A spot under the wing and the anterior border of prothorax 

 in part, yellow or tawny. 



Bess. a. cliff'. — This species is an example of the difficulty of 

 the study of these numerous little Mexican species, which is not 

 possible but with numerous specimens. It quite resembles E. 

 regulus, but the body is very much polished (like glass), very 

 black, not grayish, and the more elongate filiform part of the 

 petiole gives it a peculiar appearance ; the yellow ornaments also 

 are bright yellow, not citron ; the yellow fascia of the 2d segment 

 is wider, and nearly double ; the tip of petiole has a fascia; lastly 

 the character of the wing is a very sure guide in distinguishing 

 this species. 



Eab. Mexico. Baiios. 3 9,1$. 



13. E. avicillUS n. sp. — Parvulns, thorace valido, globoso, convexo, 

 dense cribrato-punctato ; abdomine punctata; petiolo postice trigonali 

 obscure rufo-variegato, scutellis et pedibus partim rufis ; alis nebulosis ; 

 variat scutello nigro, post-scutello flavo. 



$>. Total length, 8-9 mill.; wing, 6.3 mill. 

 % . Total length, 7.5 mill. ; wing, 5 mill. 



9. Form much the same as in E. regulus. But the thorax 

 much larger, cubic; the petiole wider, more triangular posteriorly, 

 and more inflated. Head a little more strongly punctured, thorax 

 more densely, quite densely cribrose ; the petiole and abdomen are 

 also densely punctured, but not so coarsely as the thorax. Clypeus 

 a little wider, cribrose, its apex also suhbidentate, or divided by 

 a little groove. Disk of mesothorax more wide than long, parted 

 anteriorly by a little suleosity ; SCUtels quite oblique, forming 

 altogether with the metathorax the convex hind face ol' the 

 thorax. Second segment depressed. 



Black, very slightly sericeous. Tips of mandibles, antennae 

 beneath, a frontal spot, a line behind the eyes, borders o( pro- 

 thorax, mesoplenrse, tegulae, scu'tels, sides oi' metathorax and of 

 the abdomen, borders oi' all the segments, tibiee, aiul tarsi, dull- 



