250 J. L. LECONTE, M. D. 



2. A. prolixus, n. sp. — Slender, linear, piceous black, shining, head, pro- 

 thorax and elytra uniformly deeply but not coarsely punctured. Prothorax a 

 little wider than long, angles nearly rectangular, sides broadly rounded, base 

 broadly but feebly impressed at the hind angles. Elytra a little wider, and 

 one-third longer than the prothorax, sutural stria impressed. Dorsal segments 

 mere finely punctured, posterior margins and 'tip piceous. Beneath piceous, 

 shining, punctulate. Length 4 mm; .16 inch. 



New York, one specimen kindly given me by Mr. Ulke. Larger 

 and more slender than the next species. 



3. A. call Torn icas. Lispinus cat. Lee. New Spec. Col. 59. 



Middle California, abundant under oak bark. • The posterior trans- 

 verse curved impression of the prothorax is sometimes very feeble. 

 This species greatly resembles in appearance Holotrochus. 



L.ISPINVS Er. 



Body stouter, more convex, prosternum extremely narrow 2. 



Body slender, depressed, prosternum wider and more prolonged .3. 



2. — Elytra, prothorax and abdomen equally punctured...!, aifinipunctatns. 



Elytra and prothorax distinctly punctured 2. obsciirilS. 



Elytra and prothorax nearly smooth 3. teiiuis. 



MICROPEPLID^. 



But two genera of this subfamily are known,- which may be dis- 

 tinguished as follows : 



Head, prothorax and elytra costate MICROPEPLUS. 



Body without elevatec^ lines KALISSUS. 



MIC"ROI»EPL,US Latr. 

 The suture and side margin of the elytra are elevated, and in the 

 intermediate space there are four acute costae, of which the first and 

 second are entire, the third and fourth sometimes abbreviated behind, 

 with the interspace narrower and more elevated ; these two costse 

 sometimes coalesce, so as to form a single ridge, the interspaces are 

 cribrate, punctured or smooth, according to species. Three natural 

 groups are indicated by the form of the prothorax : 



I. — Body elongate-oval, prothorax with sides rounded and subserrale, wider 

 than prothorax at base, hind angles slightly obtuse; elytra each with 

 four straight entire dorsal costte; interspaces coarsely punctured. 



1. laticollis. 



II. — Body oval, less elongate; prothorax with sides angulated, widest in front 

 of the base; hind angles obtuse; elytra with the two outer costse shorter, 

 interspaces coarsely punctured 2. puuctatus. 



