AMERICAN COLEOPTERA. 109 



arc tliree bristles, one long and two much shorter, so that without 

 being able to observe the spurs on the middle tibiae, the fact of the 

 occurrence of one bristle near the tip of the femur indicates two tibial 

 spurs, while three bristles indicate one spur. 



The above-mentioned characters have been made use of in the 

 arrangement of our species in the manner shown in the following 

 table : 



Mesosternum obtusely elevated. Body subdepressed. 



Thorax piceous, hind angles rufo-testaceous littorcilin. 



Thorax testaceous, apical third or half piceous Kuoxii. 



Mesosternum distinctly carinate. Body robust. 

 Middle tibiae with one terminal spur only. 



Elytra unicolored or feebly paler along the base; spinulcs of the tip of 



middle tibiae ascending, (fig. 33) crassum. 



Elytra with well-defined red spot on each; spinules of middle tibise termi- 

 nal only bisiguatum. 



Middle tibiae with two distinct terminal spurs, (fig. 34). 

 Elytra without setigerous punctures. 

 Abdominal segments without long setae at the sides. 

 Elytra densely punctulate. Sj)ecies of moderate size. 



Elytra broader than long. Color of body pale castaneous. Hind 



angles of thorax subacute ca^itaiicum. 



Elytra as loug as wide. Color piceous. Hiud angles obtuse. 



piibescens. 



Elytra very sparsely punctulate. Species very small parvuluin. 



Abdominal segments with long setae at the sides, arising from rather 

 large deep punctures. 



Thorax finely punctulate merely ba^alc 



Thorax finely punctulate and alutaceous opiciilU. 



Elytra with a row of setigerous punctures near the margin. 

 Abdomen setose at the sides scriptuni. 



It sometimes happens that the setae of the abdominal segments are 

 removed by abrasion, but the large punctures from which they arise 

 may be seen so that the presence of the one is an indication of 

 the other. 



C littoreiim, Linn. — Subdepressed, brownish, subopaque, clothed with 

 fine sericeous pubescence. Head piceous, finely and sparsely punctiilate. 

 Antennae pale brownish, four basal and two apical joints palc;r. Thorax 

 brownish, hind angles broarlly rufo-testaceous, broader than tiie elytra, hind 

 angles subacute, surface moderately densely and finely punctulate and pubes- 

 cent and under high power distinctly alutaceous. Elytra longer than wide, 

 slightly narrower at apex, color brownish opaque, a large basal spot, testaceous 

 on each elytron, surface densely and very finely jjunctulate and with brown 

 silken pubescence. Abdomen piceous, hind margins of each segment paler, 

 surfacve less densely punctured and pubescent than the elytra. Body beneath 

 piceous, legs an<l coxae testaceous. Length .14 — .16 inch ; 3.5 — 4 mm. 



Massachusetts and Canada. 



