110 E. T. CRESSON. 



yellow at base, posterior coxae and trochanters stained with lilncliish, tips of 

 their tibiae and most of their tarsi dusky; claws pectinate; abdomen subses- 

 sile, subclavate, shining ferruginous, basal half of first segment and stains on 

 the two apical segments, black; first segment longer than its apical breadth, 

 with two well-defined carina? on the basal half. Length SJ lines. 

 Hah. — Connecticut. (Coll. Mr. E. Norton.) One specimen. 



T. philantboides. — ■^. Robust, black, shining, subpubesoent; face and cly- 

 peus grossly jiunetured, the former prominent in the middle, with two approxi- 

 mate, rounded, j-ellow spots on the middle, and a small transverse one immedi- 

 ately beneath the antennae; mandibles tinged with rufous; antennae longer 

 than head and thorax, reddish-brown, dusky at tips, the scape beneath yellow ; 

 prothorax larger than usual, with a yellow mark on each side above; mesotho- 

 rax narrow anteriorly; scutellum prominent, rounded and convex behind, 

 deeply, transversely excavated at base, with a large, yellow, lunate mark occu- 

 pying most of the surface ; postscutellum with a transverse yellow mark ; meta- 

 thorax very short, abruptly truncate behind, the elevated lines very sharply 

 defined; tegulae pieeous ; wings subhyaline, iridescent, stained with fuscous, 

 especially along the costa, nervures and stigma brown, the former paler at base, 

 areolet subpetiolated, subtriangular ; legs short, black, tips of trochanters and 

 of femora, the four anterior tibiae and tarsi, and the basal two-thirds of the 

 j)osterior tibiae, lemon-yellow; claws pectinate; abdomen sessile, robust, sub- 

 cylindrical, subconvex above, densely strongly punctured, subsei'iceous at tip, 

 all the segments transverse, and prominent on the dorsal middle; apical mar- 

 gin, much broader on the first, of all the segments, except the last, bright lem- 

 on-yellow; first segment quadrate, with two well-defined central, longitudinal 

 carinas, not reaching the apex; apical segment truncate jiosteriorly ; venter 

 yellowish. Length .3J lines. 



Hah. — Illinois. (Benj. D. Walsh.) One J specimen. This very distinct spe- 

 cies, Mr. Walsh refers to a new genus which he calls Catocentris. 



T. articulatus. — 9. Black, shining; clypeus, mandibles and palpi pale yel- 

 low ; antennae longer than head and thorax, brown-black, paler at tip, scape be- 

 neath yellowish ; thorax polished ; mesothorax slightly imjjressed on each side 

 anteriorly; metathorax with elevated lines subobsolete; tegulae, spot before, 

 and base of wing nervures whitish; wings hyaline, beautifully iridescent, ner- 

 vures and stigma black, areolet wanting; legs slender, ferruginous, four ante- 

 rior coxae and all the trochanters whitish, posterior coxae black, tips of poste- 

 rior femora, of their tibiae, and their tarsi, blackish, base of their tibias yellow- 

 ish ; claws pectinate; abdomen subpetiolated, depressed, ovate, or somewhat 

 snatulate, polished, pieeous, apicil margin of all the segments pale luteous, 

 with a patch of the same color on the basal middle of the third and fourth seg- 

 ments; first segment smooth and p dished, rapidly dilated to the tip, without 

 any distinct median carinas; venter pale, dusky at tip. Length 2 lines. 



Hah. — Hudson's Bay Territory. (Coll. Mr. E. Norton.) One specimen. 



Bassus tibialis. — 9- Black; spot on mandibles, palj^i, tegulae, two spots be- 

 fore, apical margin of scutelhxni, and base of posterior tibiae, white; rest of pos- 

 terior tibiae and tarsi black; stain on. scutellum, pleura and rest of legs honey- 

 yellow; wings hyaline, iridescent, nervures brown, base of stigma pale, areolet 

 small, oblique, petiolated ; antennae brown, scarcely as long as body; mesotho- 

 rax very finely punctured; metathorax delicately jDunctured, rather abrupt be- 

 hind; abdomen depressed, the first three segments coarsely sculptured, the re- 



