238 Trans. Acad. Sci. of St. Louis. 



the punctures of the elytra relatively very coarse and rugose, those of 

 the abdomen rather fine, black throughout, the prothorax sometimes 

 obscurely rufescent, the elytra pale in apical fourth, the pale area not 

 extending anteriorly along the suture except very slightly; head some- 

 what Tpider than the elytra; eyes convex, prominent, at about their 

 own length from the base; prothorax but slightly elongate, very little 

 narrower than the head, the sides rather strongly rounded behind 

 apical fourth, thence unusually convergent and nearly straight to the 

 broadly obtuse but distinct basal angles; elytra elongate, gradually 

 narrowed toward tip, just visibly wider and only very slightly longer 

 than the prothorax; abdon^en gradually broader posteriorly.- Male 

 with the deep and acutely angulate incisure of the sixth ventral deeper 

 than wide, moderate in size, with coarsely beaded sides and with the 

 opening scarcely a third as wide as the segmental apex. Length 3.7 mm. ; 

 width 0.52 mm. Rhode Island (Boston Neck) spectrum n. sp. 



Body very slender and parallel, pale ochreo-testaceous in color, the head, 

 a spot on each elytron somewhat variable in size but situated at the 

 external margin behind the middle, and last two ventrals, black, in the 

 last case extending anteriorly onto the fourth segment as a rule; head 

 elongate, well developed, much wider than the elytra, the eyes moder- 

 ately convex and at their own length from the base; prothorax much 

 narrower than the head, slightly elongate, broadly rounded at the sides 

 anteriorly and only moderately narrowed thence to the base; elytra 

 elongate, but little narrowed posteriorly, just visibly wider and only 

 slightly longer than the prothorax; abdomen slender, gradually broader 

 behind. Male with the angulate notch of the sixth ventral moderate in 

 size, more broadly triangular than usual, with the side margins widely 

 beveled, the opening nearly one-half the segmental width and some- 

 what wider than the depth. Length 3.3-3.7 mm.; width 0.5 mm. 

 Iowa binotatus Say 



10 — Prothorax unusually small, much narrower than the head. Body 

 moderately slender, black or piceous-black throughout, the elytra pale 

 in apical two-fifths at the sides and half at the suture, the legs and 

 antennae pale flavotestaceous; head large and well developed, a 

 little longer than wide, abruptly narrowed before the rather small 

 but strongly convex eyes, this part only about four-fifths as wide as 

 the part behind the eyes, the base broadly arcuato-truncate; pro- 

 thorax very small, elongate, three-fourths as wide as the head, the 

 sides broadly rounded anteriorly and thence unusually convergent to 

 the base; elytra large, but little longer than wide, not evidently nar- 

 rowed posteriorly, wider than the head, two-fifths wider and a third 

 longer than the prothorax; abdomen much narrower than the elytra 

 but wider than the prothorax, parallel, not distinctly wider posteriorly, 

 rather coarsely asperate. Male with the notch of the sixth ventral 

 rather large, much deeper than wide, somewhat parabolic in outline, 

 the angle very narrowly rounded, the edges strongly beaded, the pos- 

 terior angles slightly obtuse but scarcely rounded, the opening nearly 

 a third as wide as the segmental apex. Length 3.3-3.7 mm. ; width 

 0.65 mm. New York to Iowa cinctus Say 



Prothorax well developed, only slightly smaller than the head 11 



