462 Mr. F. P. Pascoc on some Australian Colydiiclae, 



repetition, noticing those characters which either belong to the 

 genus, or which are so slightly modified as scarcely to be appreciated 

 even when neighbouring species are contrasted with one another. 

 For the generic characters, so far as they relate to DeretapJtrus and 

 Bothrideres, I must refer toM. Lacordaire's 'Genera des Coleop teres,' 

 ii. pp. 377-78, where thej^ will be found carefully and accurately de- 

 tailed. PentJieUspa is described in this Journal, p. Ill : its species 

 are foimd in all parts of the world, except Europe. 



Table of the Species of Deretaphrus. 



Prothorax with a sharply defined longitudinal impressed line or canal. 

 Protlioi'ax coarsely punctured. 

 Elytra subdepressed. 



Third interstitial line strongly elevated or costseform. 

 Interstitial lines finely punctured ; pitchy 



black, subnitid D, fossus. 



Interstitial lines scarcely punctured ; rufous 



brown, opake D. ignarus, n. s. 



Third interstitial line not elevated D. viduatus, n. s. 



Elytra narrower, subcylindrical D. colydioides, n. s. 



Prothorax finely puuctiu'ed. 



Pitchy black, shining ; broader D. jnceus. 



Dark chestnut, or rufous brown, glossy ; narrower D. BaketvelUi, n. s. 

 Prothorax with a shallow longitudinal impression . . D. Erichsoni. 



Deretaphi'us Wollastoni, Newm. (Zool. 1855, App. ccx.), ajipears 

 to be characterized by a '' ridge or keel " parallel with and on each 

 side the median impression. 



Deretaphrus ignartis. 



D. obscure rufo-fuscus; prothorace fortiter punctato, canaliculo antico 

 obsolete ; elj^ris interstitiis (duobus internis exceptis) costatis ; pedibus 

 ferrugineis. 



Hob. Sydney. 



Dull rufous brown ; head and prothorax strongly pimctured, the 

 latter with a sharply impressed, longitudinal canal, scarcely extending 

 beyond its basal half, no anterior canal, but a shallow depression 

 instead ; elj-tra seriate-punctate, the interstices, except the two inner, 

 raised into sti-ongly marked costfe, especially the basal portions of the 

 third *, fifth, and seventh, the punctm-es large, and at regular inteiwals ; 

 body beneath red'dish pitchy, rather coarsely but not closely punctured ; 

 legs ferruginous, subnitid. Length 5 lines. 



The drdl rufous-brown colour and the single prothoracic canal, 

 together with the elevated costse on the elytra, sufficiently charac- 

 * The sutural line is counted as the first. 



