SILVAN us. 459 



Silvanus. 



A, Side margin of thorax with six teeth. 



Brown ; pubescence rather close, yellowish-gray. Thorax 

 with two deep longitudinal furrows separated and bounded 

 by three raised lines ; elytra with punctured striae, alter- 

 nate interstices raised. L. 1\ 1. Eather common. 



aS^. surinamensis, Lin. 



H. Side margin of thorax not toothed. 

 Anterior angles of thorax produced. 



a. Thorax with two shallow longitudinal furrows. 



Rust-red, dull ; pubescence very fine. Head toothed on 

 each side l)ehind eyes ; posterior angles of thorax with a 

 little blunt tooth ; elytra with close punctured striae, alter- 

 nate interstices somewhat raised. L. 1| 1. Scarce. 



S. bidentatus, Fab. 



b. Thorax without longitudinal furrows. 



X. Thorax closely and finely punctured, somewhat in 

 wrinkles ; sides with two slight emarginations ; 

 posterior angles with a little tooth. 



Keddish - yellow ; pul lescence very short. Antennae 

 ratlier shorter than head and thorax ; head with a little 

 tootli on each side behind eyes, forehead finely punctured 

 behind, almost smooth in front ; elytra elongate, tolerably 

 parallel-sided, with very close punctured striae, alternate 

 interstices slightly raised. L. 1^ 1. Not uncommon. 



S. unideiitatus, Tab. 



II. Thorax very closely, deeply punctured ; sides 

 scarcely emarginate ; posterior angles obtuse. 



Brown or brownish-yellow ; pul)escence extremely short. 

 Antennae nearly as long as head and thorax ; head with an 

 extremely small tooth behind eyes, forehead deeply punc- 

 tured ; elytra oblong, almost ovate, with very close punc- 

 tured striae, feebler at apex, alternate interstices slightly 

 raised. L. l\ 1. Rare. S. similis, Er. 



I>iplocoeliis, 



Eather flat, with rather long pubescence. Brown-yellow 

 or brown ; head, thorax and l»ase of elytra usually lighter ; 

 antennae and legs reddish. Sides of thorax feebly notched, 



