108 E. T. CRESSON. 



and of their tarsi, whitish; abdomon subsericeons, the basal segment longer 

 than in 9- with the carinse less developed. Length 3 lines. 



Hah. — Mass.. %; N. J. 9 • Two specimens. This and the next species seems 

 to belong to Erromenus. Holmgren. 



T. dimidiatus. — % . Robust, black, shining, head and thorax sparsely clothed 

 with pale pubescence; clypeus entirely or in part rufous or ferruginous; an- 

 tennfe longer than the head and thornx, dull black: thorax feebly punctured; 

 scutellum somewhat elevated, the upper surface depressed, the base deeply, ex- 

 cavated transversely, the posterior margin fringed with long, pale pubescence; 

 metathorax short, truncate behind, rugulose, with well-defined elevated lines, 

 forming an elongate central area; tegulse pale pieeous, the anterior margin pale, 

 sometimes entirely pale; wings hyaline, iridescent ; nervures and stigma brown- 

 black, both pale at base, areolet oblique, subpetiolated ; legs short, robust, fer- 

 ruginous, coxfe and trochanters black, extreme base of posterior tibiae and of 

 tarsi palish; claws pectinate; abdomen robust, subclavate, subconvex, subses- 

 sile, black, second, third and fourth segments ferruginous, sometimes the fourth 

 is entirely black, or more or less tinged with brown; the apical segments are 

 sometimes pale at tip; first segment carinated on the sides and on each side of 

 the middle, the latter not reaching the tip of the segment. Length 3 — 3i lines. 



Hub. — X. J., Pa. Seven specimens. 



T. annulipes. — 9- Black, shining, thinly clothed with a short pale pubes- 

 cence ; face silvery; clypeus, most of mandibles and palpi pale yellow; anten- 

 nae longer than the body, slender, brown-black, paler at tips; mesothorax im- 

 punctured ; metathorax with well-defined elevated lines, forming a large sub- 

 quadrate central area ; tegulse and nervures at base of wings pale yellow ; wings 

 hyaline, iridescent, nervures and stigma brown-black, the latter pale at base, 

 areolet subpetiolated, triangular; legs rather slender, bright ferruginous, the 

 four anterior coxae, all the trochanters, the four anterior tibiae except tips, and 

 base of their tarsi, yellow; extreme tips of posterior femora, their tibiae, except 

 a broad whitish annulus nearer the base, and the apical half of their tarsal 

 joints black; claws pectinate; abdomen subpetiolated, subclavate, polished, 

 black, with the second, third and middle of the two following segments rufo- 

 ferruginous; first segment elongate, gradually dilated to the tip, carinated on 

 the sides and on each side of the middle, the latter reaching the tip of the seg- 

 ment. ]jength 3V lines. 



Hab.—Yi. Resolution, Great Slave Lake. (Coll. Mr. E. Norton.) A pretty 

 species, with handsomely ornamented legs. The tip of the abdomen beneath 

 has a bunch of small, worm-like objects, of a whitish color, arranged trans- 

 versely with the heads outside. This and the six following species seem to 

 belong to Polyblastu.'i. 



T. burrus.— 9 • Black, shining, clothed with a short pubescence; clypeus pi- 

 eeous, most of mandibles and the palpi, j)ale yellow; antennae longer than head 

 and thorax, reddish-brown, paler at base beneath; mesothorax with a well-im- 

 pressed longitudinal line on each side of middle, becoming obsolete before the 

 base; a spot before and another beneath tegulae ferruginous ; scutellum triangu- 

 lar, subconvex above, deeply excavated at base; metathorax with sharp ele- 

 vated lines, forming an elongate central area, which is slightly striated trans- 

 versely; tegulae yellowish; wings hyaline, iridescent, nervures and stigma 

 brown, the latter pale at base, areolet petiolated, oblique, elongate; legs en- 

 tirely ferruginous, except tips of posterior tibiae, which are dusky; claws pec- 



