140 Trails. Acad. Sci. of St. Louis. 



two-fifths longer than the prothorax; abdomen narrower^ more densely 

 punctulate and dull, distinctly narrower than the elytra. Male with 

 the fifth ventral wholly unmodified, the sixth elongate-ogival in form, 

 the very narrow apex with a minute and circularly rounded, very abruptly 

 formed emargination, a third wider than deep, the lobes of the apex 

 acute and not rounded, the surface adjacent with an ill-defined but dis- 

 tinct impression along the median line, strongest at apex and disappear- 

 ing at two-fifths from the base ; female nearly as in fragilis. Length 

 4.0 mm.; width 0.68 mm. Pennsylvania, Indiana and Mississippi 

 (Vicksburg) rubidan.sp. (Fvl. MS.) 



12 — Head slightly wider than the prothorax. Body very slender, the head 



and prothorax piceous-black, the elytra testaceous, with a piceous 

 scutellar cloud; abdomen blackish, rufescent at tip, the legs and 

 antennae pale; head well developed, sparsely, rather coarsely punctate, 

 parallel at the sides, the angles rather broadly rounded; eyes very small, 

 at two and one-half times their length from the base ; antennae moderate, 

 slightly incrassate, the medial joints scarcely one-half longer than wide; 

 prothorax narrow and notably elongate, the sides just visibly con- 

 verging throughout and straight, the punctures sparse but rather coarse, 

 very close-set in a single impressed series at each side of the medial 

 smooth area ; elytra narrow and elongate, the sides straight, only just 

 visibly diverging, the punctures fine, sparse, arranged in unimpressed 

 series; abdomen not quite parallel, at base distinctly narrower than 

 the elytra, but, posteriorly, fully as wide as the latter, finely but not very 

 densely punctulate and feebly shining. Male with the fifth ventral 

 wholly unmodified, the sixth broadly obtuse at tip, with a parabolic 

 and gradually formed sinus, a third as wide as the apex, twice as wide as 

 deep and symmetric, the adjoining surface narrowly and feebly im- 

 pressed along the middle for a short distance; female unknown. 



Length 4.7 mm. ; width 0.68 mm. Iowa famelica n. sp. 



Head more or less distinctly narrower than the prothorax 13 



13 — Form slender, subparallel, slightly depressed, pale testaceous through- 



out, the elytra sometimes clouded with piceous toward, but not attaining, 

 the suture ; head and abdomen piceous or black, the latter rufescent 

 toward tip; head parallel at the sides, very sparsely punctate, the basal 

 angles not broadly rounded; eyes at very slightly less than twice their 

 own length from the base; antennae rather thick, extending nearly to 

 the middle of the elytra, feebly incrassate, the medial joints barely 

 one-half longer than wide; neck distinctly more than half as wide as 

 the head; prothorax elongate, narrow, parallel, the sides straight, 

 punctured as in rubida; elytra elongate, the sides feebly diverging and 

 straight, two- fifths wider and fully a third longer than the prothorax, 

 the punctures moderate, impressed, rather close-set in scarcely im- 

 pressed series; abdomen narrower than the elytraj subequal thereto 

 posteriorly, densely punctulate and dull. Male with the sixth ventral 

 nearly as in rubida, the apex slightly more obtuse, the notch a little 

 larger and twice as wide as deep and the impression of the surface 

 broader, feebler and less defined. Length 4.2 mm.; width 0.7 ram. 



Iowa and Lake Superior ambigna Lee. 



Form slender, parallel, nearly similar to the preceding but more convex, 



