THE CAERION BEETLES. 283 



KEY TO INDIANA SPECIES OF COLON. 



a- Hind femora of male with a long tooth on the inner margin near the 

 tip; hind tibisB curved. (Fig. Ml, d.) hubbabdi. 



aa. Hind femora of male without trace of tooth. 



y. Hind angles of thorax distinct, sometimes acutely rectangular. 



c. Body broader in front, the elytra rather rai^idly narrowing to apex, 



with feebly curved sides. 

 (I. Surface subopaque, densely punctured; sutural stria entire; 

 larger, 2.5-3 mm. (Pig. 141, c.) maqnicolue. 



dd. Surface rather shining ; thorax sparsely punctate ; sutural .stria 

 evanescent near base ; smaller, not over 1.-5 mm. 



554. PUSILLXJM. 



cc. Body oblong-oval, not wider in front; elytra behind the humeri 

 usually wider than thorax, the latter with coarse, rather deep 

 punctures, with finer ones in the intervals. (Fig. 141, a and 6.) 



thokacicdm 

 66. Hind angles of thorax obtuse or rounded. 



d. Color piceous, legs reddish-brown ; middle tibiae of male straight. 



aspebatdm. 

 dd. Color reddish-brown ; middle tibiae of male distinctly curved. 



555. OBtONGUM. 



C. huiiardi Horn, piceous to reddish-brown in hue and 2.5 mm. 

 in length, is known from Michigan and Ohio. C. magnicolle Mann., 

 piceous in color, occurs in Michigan and Pennsylvania. 



554 (1752). Colon pdsillum Horn. Trans. Amer. Ent. See, VIII, 1880, 



273. 



Oblong-oval, evidently broader in front. Dull reddish-brown, finely 

 pubescent. Antennae pale, reaching middle of thorax, the last joint as long 

 as preceding and obtuse. Thorax one-half wider than long, sides feebly 

 curved and narrowing to front, disk finely not densely punctate. Elytra as 

 wide at base- as thorax, surface rather densely and roughly punctate. 

 Length 2 mm. 



Marion, Lawrence and Posey counties; scarce. April 21-May 

 16. Taken by sifting debris from about the base of trees. One 

 male has a minute tooth arising from the middle of hind femora 

 and is to be referred to C. putum Horn, which is probably synony- 

 mous. 



C. thoracicKm Horn, reddish-brown, the elytra with a central 

 dark cloud, length 2.5 mm., was described from ^Missouri and the 

 District of Columbia. C asperatum Horn, length 2 mm., is, known 

 from Michigan and Illinois. 



555 ( ). Colon oblongum sp. nov. 



Oblong-oval. Dai-k reddish-brown, sparsely clothed with fine yellowish 

 hairs. Head densely and finely ijunctate ; antennae reaching middle of 

 thorax, the apical joint paler, not Icmger and slightly narrower than tenth. 



