114 E. T. CRESSON. 



Exochus propinquus. — % 9- This is very closely allied to la^vis. being of the 

 same color, but is more elongate and less robust, and the abdomen is longer and 

 narrower. In /a:vis there is always a reddish stain on the face immediately be- 

 neath the insertion of the antennee; but in the present species the face is en- 

 tirely black, except occasionally a faint yellowish transverse mark on the up- 

 per margin. In the % there is a conspicuous transverse yellow, line beneatli 

 the antennae. Length 3J lines. 



Ilab. — Me., Mass., Conn. Four 9 ,> t"'o %, specimens. E. lavis varies in 

 length from 11 to 3i lines. 



E. atrocoxalis. — J. Shining black; an angular, whitish line between the 

 autennse and sometimes a mark of the same color on each side of tlie face ; an- 

 tennae entirely black j tegulse and a sjiot before, white ; one specimen has the 

 scutellum margined on the sides and at tip with white and the postscutellum 

 has a white transverse line; while in the other specimen there is merely a 

 white dot on each side of the scutellum near the base; metathorax with a large 

 central area; wings hyaline, iridescent, nervures bla-k, areolet wanting; legs 

 with the coxse and femora not so much dilated as in Icevis, fulvous, the coxae 

 and trochanters black; abdomen much longer than in kcnis, and distinctly 

 2)unctured ; the first segment with two longitudinal carinffi near the base. 

 Length i — 4J lines. 



Hab. — Dakota Territory. (Mr. H. Ulke.) Two J specimens. 



E. albifrons. (Walsh, MS.) — 9 • Black, shining, finely pubescent, subsericeous ; 

 face, a dot at summit of eyes, and mouth yellowish-white; a dusky spot on mid- 

 dle of the face; antennae long, slender, pale testaceous beneath; tegulse, sutu- 

 I'al line before the wing, the apex and sides of scutellum, and the postscutellum, 

 whitish; extreme sides of metathorax fulvous; wings hyaline, iridescent, ner- 

 vures^ black, areolet wanting; legs bright fulvous, the anterior pair paler in 

 front; tips of posterior tibiae black, their tarsi white, the joints ti2)ped with black ; 

 abdomen as in atrocoxalis. Length 3J lines. 



Hah. — Illinois. (B. D. Walsh.) One 9 specimen. 



E. cariuatus. — This seems to belong more properly to Exochu.'i, as the face is 

 more or less protuberant. Mr. Walsh refers it (in MS.^ to a new genus which 

 he calls Polyrhabdus. It varies considerably in size, and the face is sometimes 

 entirely yellowish. Length 2 — Si lines. ; Fourteen specimens from Conn., 

 Mass., and Illinois. 



E. semirufus. — % 9- Slender, black, polished, subpubescent; head entirely 

 l)Iack; palpi pale; antennae brown-blaek; tegulae and a spot before, whitish ; 

 metathorax as in Icevis; wings hyaline, iridescent, nervures pale brown, areolet 

 wanting; legs less robust than usual, entirely ferruginous; abdomen long, nar- 

 row, polished, ferruginous, the first segment more or less black, and sometimes 

 the apical segments are more or less dusky. Length 4 lines. 



Hab. — Mass., Ct., N. Y. Five 9? Ave % sjiecimens. 



