106 E. T. CRESSON. 



extreme bass and apex, bright fulvous, spot on four anterior tarsi, base of pos- 

 terior trochanters, narrow annulus near base and apex of their femora, tips of 

 tibiae, annulus near base, and their tarsi except extreme base, black, rest of 

 legs white; abdomen elongate, subsessile, subdepressed, smooth and shining. 

 Length 3j lines. 



Hah. — Massanhusetts. One % specimen. It gives me much pleasure to dedi- 

 cate this lovely species to my friend Mr. Edward Burgess, who captured it at 

 Beverly, Mass., and kindly jjresented it to this Society. 



T. tarsalis. — 9 • Black, shining ; a U-shaped mark on the face, confluent be. 

 neath with a spot on the clypeus, the latter, except a dusky dot on the anterior 

 middle, and the mandibles, except tips, white; palpi pale, dusky at tips; an- 

 tennse nearly as long as the body, black, rufo-testaceous beneath ; a cuneiform 

 mark on each side of mesothorax, tegulse, a spot before and another beneath, 

 most of scutellum and the postscutellum, white; metathorax rugose, with a 

 well-defined, rounded central area, and a broad, deep excavation at tip, sur- 

 rounded by a sharply defined carina; most of pleura, above and beneath, and 

 a round spot on each extreme side of metathorax, fulvo-ferruginous : wings hy- 

 aline, subiridescent, nervures and stigma black, areolet wanting; legs, inclu- 

 ding the coxae, bright fulvo-ferruginous ; posterior trochanters, femora, tibiae 

 and tarsi, black, tips of their trochanters, and a narrow annulus near base of 

 their tibiae, white, their tarsal joints flattened, claws simple; abdomen subses- 

 sile, somewhat shining, apical margin of the second and following segments 

 more or less distinctly, narrowly white; first segment with two central, longi- 

 tudinal carinae, divergent at base, but not extending to the tip of the segment; 

 apical segments subcompressed, the tip subtruncate when viewed laterally; 

 venter banded with white. Length 5 lines. 



%. — Long, slender, black; face, anterior orbits, clypeus, mandibles, cheeks 

 beneath and the palpi, white ; antennae long and slender, blackish above, dusky 

 beneath, towards the base white; line on collar, cuneiform mark on each side 

 of mesothorax, tegulae, spot before and another beneath, pectus and pleura be- 

 neath, extending up on the sides of the latter, and spot on scutellum, white; 

 metathorax almost smooth and subpubescent ; wings hyaline, iridescent, ner- 

 vures and stigma brown, the former whitish at base of wings, areolet wanting 

 as in 9 ; legs long and slender, the two anterior pairs whitish, their femora 

 faintly tinged with fulvous; posterior coxae fulvous, their trochanters black at 

 base, white at tip, their femora black, their tibiae and tarsi blackish, the former 

 pale at base, tibial spurs white; abdomen long and slender, petiolated, clavate, 

 first segment long, gradually dilated to the tip, with the stigmatic tubercles 

 prominent and placed at the middle; apical middle of the third and following 

 segments with a transverse white spot, becoming broader and larger on the api- 

 cal segments, lateral margins of these segments also narrowly whitish ; beneath 

 pale, varied with dusky. Length 44 lines. 



Hab. — Connecticut. (Coll. Mr. E. Norton.) Two specimens. This is closely 

 allied to submarginatus ; the % may not belong to this species, although the color 

 and markings are much the same. 



T. sethiops. — 9- Black, shining ; face long, narrow ; eyes long and narrow, 

 slightly eJULirgiuate on each side of antennae, which are fulvous, black at base, 

 robust and longer than head and thorax; a short, yellowish line beneath tegulae; 

 scutellum elevated, the upper surface semicircular, carinate on each side at 

 base, which is deeply excavated ; metathorax subpubescent, with a well-defined, 

 subf^uadrate central area, apex rather abruptly truncate ; tegulae piceous; wings 



