188 Trans. Acad. Sci. of St. Louis. 



American species before me being identifiable by the fol- 

 lowing characters : — 



Addomen uniform in coloration and concolorous 2 



Abdomen pale, with the tip black 6 



2 — Body dark in color, the prothorax more or less distinctly norrower than 



the elytra, the latter fully as long as wide or somewhat longer 3 



Body pale red-brown in color throughout, the head a little darker, the pro- 

 thorax large, fully as wide as the elytra, the latter not as long as 

 wide 5 



3 — Prothorax pale, dull rufous in color; body more slender, black, the legs 



and antennae pale; dull in lustre throughout from the extremely minute, 

 close-set punctules; head as long as wide, about three-fourths as wide 

 as the prothorax, the sides behind the well developed eyes parallel and 

 feebly arcuate, the basal angles broadly rounded; prothorax fully as 

 long as wide, parallel and feebly arcuate at the sides, the angles 

 broadly rounded ; elytra about as long as wide, distinctly wider and 

 longer than the prothorax. Length 4.0 mm.; width 0.65 mm. North 

 Carolina (Asheville), New Jersey, New York and Rhode Island. 



mflcolle n. sp. 



Prothorax dark and concolorous; anterior tarsi of the male very strongly 



dilated 4 



4 — Body parallel, black, dull in lustre, the prothorax never more than 



faintly piceous, black in maturity; elytra moderate, quadrate, only very 

 slightly wider and about a fourth longer than the prothorax; head fully 

 four-fifths as wide as the prothorax, rather wider at base than at the 

 moderately developed eyes; prothorax relatively lai'ger, but little wider 

 than long, parallel. Length 3.3 mm. ; width 0.7 mm. Massachusetts. 



thoracicum n. sp. 



Body less parallel, the elytra relatively larger; black and dull throughout, 

 the legs dark piceous; head very small, three-fourths as wide as the 

 prothorax, nearly as in ruficolle; prothorax slightly wider than long, 

 parallel and feebly arcuate at the sides, the angles rounded; elytra 

 quadrate, fully a fourth wider and two-fifths longer than the prothorax. 

 Length 3.75 mm.; width 0.75 mm. Nevada (Reno), California (Lake 

 Tahoe) and Oregon (Albany) capitulum Csy. 



5— Body, legs and antennae pale testaceous, the head piceous; dull in lustre 

 throughout, rather stout and parallel in form; head unusually large, 

 as wide as long, of the usual form, about four- fifths as wide as the pro- 

 thorax, the latter very large, just visibly wider than long, fully as wide 

 as the elytra, parallel, the sides feebly arcuate, the angles broadly 

 rounded; elytra depressed, a little shorter than wide, but very slightly 

 longer than the prothorax. Male not known but probably still stouter. 

 Length 3.2 mm.; width 0.65 mm. Rhode Island (Boston Neck). 



clarescens n. sp. 



6 — Moderately stout, parallel, alutaceous, the elytra dull; pale testaceous, 

 the head, elytra and last two ventral segments black; legs and antennae 

 pale, the latter unusually long, half as long as the body; head rather 

 well developed, five-sixths as wide as the prothorax, otherwise as in 



