AMERICAN TlYMENOrXERA. 859 



thorax, 24-joliited ; thorax above coarsely rugose, except middle of 

 nie.sothorax. which is almost smooth; sides of prothorax abive more 

 coarsely rugose than rest of thorax ; pleura coarsely punctured; wings 

 violaceous-black, darker at base and along costa ; legs slender, entirely 

 shining bbick, tinged with blue-green, femora deeply punctured, first 

 joint of posterior tJrsus three-fourths the length of the tibia; claws 

 rufo-piceous, with a strong inner tooth, removed from the tip ; abdo- 

 men above steel-blue, with a slight velvety appearance, very finely 

 sculptured ; the venter and sides of dorsal segments shining and tinged 

 with greenish, the former sparsely punctured; terminal dorsal impres- 

 sion deep and rounded; amil horn (cornus) shaped much as in L'. 

 n/(iiirusj being acutely conical, not at all shouldered, much flattened at 

 base above, apex tuberculate, serrate on the sides; ninth segment con- 

 vex on the sides, smooth and polished, with a few scattered punctures; 

 ovipositor longer than the abdomen, piceuus. JiCngth 14 lines; with 

 ovipositor 17 lines."' 



New Mexico. One specimen. Not seen. 



j. U. nigricornis. 



Sira.r 7iigricornis, Fabr. Spec. Inst, i, 17S1, 418, 3, 9) Mant. Ins. 257, 4; Ent. 

 Syst. ii. 425, 5. J; Syst. Piez. 49, 5. 



"Thorax blue black, hairy ; abdomen ferruginous, at basecyaneous." Length 

 9, 0.56—1.02, with ovip. 0.G4— 1.16. B.% wings 1,06—1.80 inch. Length % , 0.48 

 0.80. Br. wings 0.80—1.24 inch. 



Shining blue-black, antennae black, about 22-jointed ; heid ami 

 thorax with an aeneous tinge ; two or three basal segments of abdomen 

 and edges of each segment beneath, blue or violet; remainder of abdo- 

 men yellow ferruginous, including cornus and ovipositor sheath; anal 

 cornus shorter than in U. cj/aneus, somewhat convex in the middle, 

 although not so abruptly shouldered as in U. Edwardsii, and serrate ; 

 ovipositor darker, not longer than abdomen without cornus; cox:e, 

 trochanters and femora blue-black, sometimes dark ferruginous; re- 

 mainder of legs yellow red, the last tarsal joint blackish ; claws large, 

 inner tooth separated; wings violaceous, sub-opaque, obscurity equally 

 diffused, slightly darker on upper margin; second brachial cell with 

 incomplete cross-nervure. 



% . — The male has the antennae 18 — 20-jointed, the third and fourlh 

 articles ferruginous; abdomen like the female, but shorter and stouter; 

 the cornus short and shouldered, with an acute point, the posterior tib:a; 

 and tarsi blackish piceous, the two apical joints of tarsi rufous, with a 

 Lkckish mark on the apical joint; wings yellow hyaline, their margins 



