44 COLEOPTERA OF NORTH AMERICA. 



it seems more nearly allied to the present series than to Laclino- 

 pJiorus. 



The following table will enable our genera to be recognized : — 



Tibial spurs very long. 



Head not constricted ; the tibial spurs finely serrulate. Ungues simple 

 or finely serrulate. ' Tetragonoderus. 



Head constricted; tibial spurs simple. Ungues with long pectination. 



Nemotarsus. 

 Tibial spurs short or at most moderate in length. 

 A. — Mandibles with distinct scrobes. 



A-(i. — Antennae with at least three glabrous joints. 



b, — Head constricted behind the eyes. Lebia. 



b b. — Head not constricted, 

 c. — Labrum large, prominent, covering in great part the man- 

 dibles. 

 d. — Antennae with three glabrous joints ; middle tibiae of male 

 incised within near the tip. Coptodera. 



del. — Antenn:e with four glabrous joints; middle tibi;e of male 

 not incised. Phloeoxena. 



c c. — Labrum moderate, not large. 

 e. — Tarsi slender, fourth joint entire. 

 f. — Labial palpi slender. 

 g. — Thorax truncate at base. 



Mentum not toothed, ungues serrate. Dromius. 



Mentum toothed, ungues simple. Apristus. 



g g. — Thorax slightly lobed at base, ungues serrate. 



Mentum not toothed. Blechrus. 



Mentum with a small emarginate tooth. Metabletus. 

 ff. — Labial palpi thick, oval ; ungues more or less serrate. 



Azinopalpus. 

 c e. — Tarsi with the fourth joint emarginate or bilobed. 

 k. — Ungues simple. Tecnophilus. 



, hh. — Ungues serrate. 



i. — Mentum not toothed, fourth tarsal joint deeply bilobed. 

 Tarsi hairy above. £iUproctus. 



a. — Mentum toothed. 

 j. — Thorax truncate at base. 



k. — Tarsi with fourth joint bilobed. Callida. 



k k. — Tarsi with fourth joint emarginate. 

 /. — Tarsi not hairy above. 



m, — Last joint of labial palpi more or less triangular or securi- 

 form, 

 n. — Thorax with the base obliqite each side, the sides narrowly 

 margined. Philophuga. 



nn. — Thorax with base squarely truncate, the sides rather widely 

 margined, especially posteriorly. Plochionus. 



