66 Trans. Acad. Set. of St. Louis. 



unmodified, the slit of the sixth very narrow and deep, nearly four 

 times as deep as wide, its sides straight and parallel, the bottom evenly 

 and circularly rounded, the edges finely beaded; female unknown. 



Length 4.8 mm.; width 0.8 mm. Iowa iowensis n. sp. 



Elytra with the basal angles widely exposed at base; body stouter, the 

 head almost semicircularly rounded behind the eyes and slightly nar- 

 rower than the elytra 10 



10 — .Body subparallel ; head very slightly longer than wide, the eyes rather 



well developed but only moderately prominent, at about one-half more 

 than their own length from the base, the portion behind them semi- 

 circularly rounded from eye to eye, with feeble truncation at the neck; 

 pro thorax slightly elongate and a little narrower than the head; widest 

 at about a third from the apex, the sides broadly arcuate; base four- 

 fifths of the maximum width ; elytra quadrate, parallel, scarcely longer 

 than wide, equal in length to the prothorax and a fifth wider; abdomen 

 parallel, distinctly narrower than the elytra. Male with the slit of the 

 sixth ventral only moderately narrow, scarcely three times as deep as 

 wide, with its sides straight and parallel but arcuately converging in 

 anterior two-fiflhs, the bottom evenly, parabolically rounded; edges 

 finely beaded throughout; sixth ventral in the female strongly impressed 

 along the middle. Length 4.2-5.6 mm. ; width 0-78-1.0 mm. New York, 



Virginia, North Carolina and Iowa littorarius Grav. 



Body, head and ej'es throughout nearly as in littorarius, the sides of the 

 head behind the eyes more unevenly arcuate, becoming straighter near 

 the eyes; prothorax narrower, smaller and relatively more elongate, much 

 narrower than the head, the sides strongly, evenly arcuate, the base 

 narrower, three-fourths of the maximum width, the latter at fully two- 

 fifths from the apex; elytra slightly longer than wide, parallel, a fourth 

 wider than the prothorax and evidently a little longer; abdomen as wide 

 as the elytra. Male with the slit of the sixth ventral about three times 

 as deep as wide, having the form of a very narrow deep parabola, its 

 sides becoming almost parallel behind, the edges finely beaded and the 

 surface of the segment adjoining anteriorly slightly flattened; female 

 unknown. Length 5.2 mm. ; width 0.9 mm. Washington State. 



pngetensis n. sp. 



11 — Form slender, nearly parallel, the head rather narrow and elongate^ 



the eyes moderate in size, at about two-thirds more than their own 

 length from the base and only moderately prominent, the sides behind 

 them distinctly convergent to the neck, at first nearly straight, then 

 rather broadly rounded through the basal angles, the base moderately 

 broadly truncate, the head similar throughout in the sexes; prothorax 

 distinctly elongate-oval, a little narrower than the head, widest before 

 the middle, with the sides broadly arcuate; elytra slightly wider than 

 the head, the sides subparallel, the apex rather distinctly and angularly 

 emarginate, not quite as long as wide and scarcely as long as the pro- 

 thorax in the male, quadrate and equal in length to the latter in the 

 female; abdomen as wide as the elytra. Male with the slit of the sixth 

 ventral fully three times as deep as wide, parallel, its sides nearly 

 straight but gradually and parabolically converging anteriorly, the 

 edges finely and strongly beaded, the bead bounded externally by a fine 



