THKOSCUS. 31 



Oblong. Eeddish-brown, pubescence rather short and 

 close. Thorax rather short, sides dilated before acute 

 posterior angles ; elytra oblong, truncate at apex, with 

 punctured striae, feebler toward suture, interstices indis- 

 tinctly and closely punctured. L. 1 1. Eare. 



T. elateroides, Heer. 



Melftsis, 



Pitch-black ; antennae brown. Punctuation rough ; pu- 

 bescence scanty, gray ; elytra with striae. L. 3 — 4 1. Not 

 common. M. buprestoides, Lin. 



Ceropliytum, 



Cylindrical. Black ; mouth, antennae and legs reddish. 

 Punctuation close and strong; pubescence fine ; elytra with 

 punctured striae, interstices wrinkled. L. 3 — 3| 1. Eare. 



C. elateroides, Latr. 



3Hcvorhagus, 



Almost cylindrical. Black ; tibiae and tarsi reddish. 

 Scantily covered with gray hairs ; punctuation deep and 

 wrinkled. Thorax with two small depressions on disc ; 

 elytra without distinct striae, except beside suture. An- 

 tennae of male comblike. L. 1| — 2 1. Eare. 



M. pygmaeus, Fab. 



BLATEBIiyAB, 



A, Under-side of thorax with deep grooves for reception of 



antennae. 



Antennae with first joint large, cylindrical, second and 

 third small, globular, fourth much broader and double as 

 long as third ; antennal grooves not quite reaching anterior 

 coxae; tarsi laterally compressed, simple. La con, Germ. 



S, Under-side of thorax with feeble or no grooves for 

 reception of antennae. 



a. Posterior coxae dilated, suddenly narrowed outward. 

 I. Under-side of thorax with traces of grooves for 

 reception of antennae. 

 Antennae with second joint small, third not much longer, 

 conical, rarely triangular, rest sawlike; head bent down- 

 ward, forehead projecting over labrum ; tarsi simple. 



Elater, Lin. 



