104 E. T. CRESSON. 



sometimes blackish throughout; thorax very densely punctured, almost granu- 

 lose ; scutellum prominent, the upper surface more or less flattened, triangular, 

 with a broad, deep excavation at base ; metathorax short, shining, with sharply 

 defined longitudinal carinse, crossed obliquely by transverse carinse, forming 

 areas, the central one subquadrate, sometimes open before and forming one cell 

 to the base of the metathorax; tegulse pale yellow; wings hyaline, iridescent, 

 dusky at extreme apical margin, nervures and stigma black, the latter whitish 

 at base, areolet triangular, more or less petiolated, sometimes much reduced, 

 rarely wanting ; legs, including all the coxae, honey-yellow, tips of posterior fe- 

 mora, and most of their tibife, blackish, the latter sometimes yellowish, with 

 the tips only black ; claws simple ; abdomen subsessile, subclavate, smooth and 

 shining, more or less strongly sericeous especially at tip, rufo-ferruginous or 

 honey-yellow, the first segment generally black, except tip, sometimes the api- 

 cal segments are blackish or dusky sometimes the segments are black, tinged 

 above with reddish ; basal segment rough, with two longitudinal central carin?e, 

 strongly divergent and prominent at base, but not reaching the tip, lateral mar- 

 gin subcarinate without distinct stigmatic tubercles. Length 3 — 5 lines. 



Var. a, — %. Abdomen entirely black. 



Var. b. — % 9- CoxiB, trochanters and sometimes posterior femora, black. 



J£ab. — H. B. T., Mass., Ct., N. Y., Pa. Thirty specimens. Very closely allied 

 to seminif/er, but that species has the scutellum carinate down the middle, 

 rounded at tip, with the lateral margin more or less strongly recurved. 



T. scutellaris.— 9 . Black, shining, face, except a dot beneath autennse, cly- 

 peus, mandibles except tips, and palpi, yellowish; antennae nearly as long as 

 the body, rufo-testaceous, dusky at base above; tegulse, a sutural, subinterrup- 

 ted, line before, and a spot beneath, the scutellum, and spot on postseutelliim, 

 yellow ; scutellum subconvex ; metathorax rugose, smooth and polished at base, 

 the carinfe sharply defined, forming areas, the central one large and extending 

 to the base; wings hyaline, the apical third duslcy, nervures and stigma black- 

 ish-brown, areolet triangular, subpetiolated; legs honey-yellow, posterior coxae 

 tinged with dusky, claws simple; abdomen subsessile, obloug-ovate, shining, 

 dark reddish-brown, the first segment black at base, with two sharply defined 

 central longitudinal cariijae, divergent at base, and becoming obsolete a little 

 beyond the middle, lateral margins carinate, with prominent stigmatic tuber- 

 cles situated a little before the middle. Length 3i lines. 



Hab. — Connecticut. (Coll. Mr. E. Norton.) One 9 specimen. 



T. varifrons. — %. Black, shining ; face, clypeus, mandibles except tips, and 

 the palpi, pale yellow; sometimes the face is black, with a large yellow spot 

 on the middle, notched above with black; antennae about as long as the body, 

 brown-black; tegulae, a sjrot bofore and another beneath, yellowish ; scutellum 

 convex, sometimes tinged with testaceous, or with a yellowish spot at tip; me- 

 tathorax uneven, with a broad subrugose excavation down the middle, bound- 

 ed laterally by a sharp carina; wings hyaline, faintly dusky, iridescent, ner- 

 vures and stigma brown, the former pale yellow at base of wing, areolet subtri- 

 angular, oblique; legs honey-yellow, coxae brown-black, tips of posterior tibiae 

 and their tarsi dusky; abdomen subsessile, slightly subclavate, depressed, shi- 

 ning, subsericeous, ferruginous, more or less black at base and apex; first seg- 

 ment with two sharply defined, central, longitudinal carinae, divergent at base, 

 but not extending beyond the middle, lateral margins carinate. Length 2i — } 

 lines. Hab. — INIassachusetts ; Connecticut. Three '^specimens. 



