168 E. T. CRESSON. 



brown beneath where the surface is smooth, rather sparsely punctured and 

 shining; prothorax above with a robust acute tubercle on each side; meso- 

 thorax excavated medially, coarsely punctured and somewhat transversely 

 striated; metathorax densely rugose, the flanks coarsely punctured, the apex 

 with a short lateral spine; wings subh3'aline, apex dusky, a broad ill-defined 

 fuliginous band on anterior pair beneath stigma, which is black with a white 

 spot at base; legs black, polished, the trochanters more or less, the knees, the 

 anterior legs in front and all the tarsi rufo-testaceous ; abdomen densely rather 

 finely rugose, smoother at apex; ovipositor as long as body. Length 9i 

 lines. 



Hah. — Louisiana, Texas. Sometimes the four anterior legs are en- 

 tirely reddish-brown. 



5. Xylonomus frigidus, n. sp. — 9' — Small, robust, black, shining; mouth 

 piceous; wings hyaline; metathorax opaque, with prominent elevated 

 lines; legs, including coxse, pale ferruginous, anterior pair pale in front; 

 posterior femora, their tibiae except base, and their tarsi black ; abdomen 

 shorter and broader than usual, subsessile, densely minutely sculptured, 

 base rugulose, apex shining; ovipositor as long as body. Length 5 lines. 



Hah. — Hudson's Bay Territory. This has much the form of an 

 Odontomcvus. 



C. Xylonomus albopictus, n. sp. — 9- — Black, shining, face except a median 

 brown line, anterior orbits, clypeus, broad posterior orbits, scape beneath, up- 

 ]jer and lower margin of prothorax, short line beneath tegulse, apexof scutellum, 

 spot or postscutellum, baud on apex of metathorax, and a spot on each apical 

 corner of all the abdominal segments, white; base of mandibles, palpi and mar- 

 gin around clypeus, dull rufous; clypeus concave; thorax depressed above; 

 inetathorax short and broad, with well defined elevated lines, base smooth and 

 polished, central rhomboidal space transversely aciculate, apex with a small 

 lateral tubercle; wings hyaline, iridescent; legs short and rather robust, two 

 anterior pairs honey-yellow; the trochanters and four anterior knees whitish; 

 four anterior tibias with a dusky spot before base, apex of their tarsi also 

 dusky.; posterior legs, except trochanters and base of their tibise, black ; abdo- 

 men much depressed, almost flat, subpetiolate, subclavate, second and third 

 segments with an arcuated lateral groove, making the middle more or less pro- 

 minent: apex incurved, shining. Length 5} lines. 



lliili. — New York. 



ODONTOMERUS, Grav. 



15i)dy and legs entirely black 1. aethiops, (Vess. 



Body black, legs yellowish ferruginous 2. mellipes, Say. 



Body and posterior legs black 3. vicinus, n. sp. 



Head and thorax black; abdomen and legs ferruginous. 



Large: coxae and trochanters ferruginous 4. bicolor, n. sp. 



Small; coxse and trochanters black 5. abdominalis, Cress. 



«. Odontomerus vicinus, n. sj). — 'J,.— Differs from mellipes % only by the 

 posterior legs, incluiliiig their coxte, being black, except base of their femora, 

 and ape.x of their trochanters, which are honey-yellow, or concolorous with 

 the four anterior le:;. Length 5 lines. 



