142 Journal New York Entomological Society, [Voi.vil 



scarcely beyond apical fourth ; under surface black, the abdomen pale at tip ; 

 legs pale, the hind femora slightly infuscate toward base. Length 1.5 mm.; 

 width 0.9 mm., Rhode Island (Boston Neck) catlterius, sp. nov. 



16 — Proriotum entirely pale in color 17 



Pronotum pale, with a median parabolic- black spot at base, which is normal in the 

 males throughout but much extended in the female of marginicollis, where it in- 

 volves all the disk except the apical angles and a fine apical margin 18 



Pronotum black, with pale side-margins or apical angles 28 



Pronotum black throughout ; elytra with the fine marginal bead at apex paler, becom- 

 ing wider in rcnoicus 43 



17 — Prothorax subequal in width to the base of the elytra, the latter about as long as 

 wide, finely and quite closely punctured, the apical margin extremely narrowly 

 reddish. Length 1.5-1. 9 mm. ; width I.O-I.3mm. North Carolina (Asheville) 

 and Alabama cervicallS Muh. 



Prothorax at base abruptly narrower than the elytra, the sides discontinuous in curva- 

 ture, strongly convergent, rather strongly and almost evenly arcuate ; disk mi- 

 nutely, sparsely punctulate scarcely more distinctly toward the sides, twice as 

 wide as long ; elytra distinctly longer than wide, rather strongly and somewhat 

 sparsely punctured, the apical margin very narrowly red; legs red throughout. 

 Length i. 8-1. 9 mm.; width 1.15 mm. Kansas kansanus, sp. nov. 



18 — Surface polished, the pronotum evidently punctate, the punctures of the elytra 

 more or less coarse and distinct 19 



Surface alutaceous and minutely granulato-reticulate, the pronotum impunctate ex- 

 cept the scars of fallen hairs ; elytral punctures very minute ; pronotal black spot 

 small and basal 27 



19 — Pronotal punctures equal in size throughout the disk ; male modifications at the 

 middle of the first ventral segment generally pronounced 20 



Pronotal punctures unequal, coarser, more close-set and more conspicuous toward the 

 middle of the disk — contrary to the general rule — and finer and sparser laterally ; 

 male modifications of the first ventral less pronounced ; legs red throughout. . 22 



20 — Pronotal punctures very small and sparse throughout ; male with a tubercle in 

 the middle near the apical margin of the first ventral, the coloration of the prono- 

 tum different in the two sexes, the male having a small transverse black spot at 

 the middle of the basal margin, the female having that somite black, with pale 

 apical angles and fine apical margin ; legs black or blackish throughout. Length 

 1.6-2.0 mm.; width I.l-I.4mm., California (coast regions from Humboldt to 

 San Diego and Calaveras Co. ); \caUfornicus Boh.] marginicollls JMuun. 



Pronotal punctures fine but distinct, more close-set toward the sides, sparser toward 

 the middle ; larger species from the Mississippi Valley and Great Lakes, broadly 

 oval in form 21 



21 — Male with a small shallow rounded pit at the middle of the apical margin of the 

 first segment, the fifth with a small deep and rounded median sinuation ; sides of 

 the prothorax very strongly convergent and broadly arcuate, continuous with those 

 of the elytra, the latter rather coarsely and sparsely punctured, with the apical mar- 

 gin very narrowly and feebly rufous ; legs red throughout. Length 1 . 9-2.3 mm. ; 

 width 1. 5-1. 7 mm. Lake Superior COnsobrinus Lee, 



