INSECTS COLEOPTERA. 55 



LISTRODERES Schonh. 



L. teretrirostris, niger oblongus, cinereo-sordide squamosus, capite rostroque confertim punc- 

 tatis, illo thorace paulo breviore paulo arcuato, cylindrico, dense argenteo squamoso baud 

 carinato, fronte sufoveato, tborace latitudine longiore, lateribus rotundatis, confertissime punc 

 tato, parce nigro-punctato et pilosello ; elytris tborace latioribus, latitudine fere duplo longiori- 

 bus ad basin late emarginatis, humeris rotundatis, nigro-variegatis striis punctatis interstitiis 

 parce uniseriatim nigro-punctatis et setulosis ; antennis piceis, articulo 3io secundo plus sesqui 

 longiore. Long. *24. 



One specimen, San Francisco. Two other specimens were found, of a much smaller size, 

 (15 18,) but I can find no character upon which to separate them, except that the scales 

 upon the thorax appear more flat, so that no scabrous appearance results. 



L. oregonensis, niger oblongus, sordide squamosus, rostro thorace vix breviore, confertim 

 punctato et rugoso, subtiliter carinato, capite confertim punctato, thorace grosse confertissime 

 punctato, latitudine vix breviore, lateribus rotundatis, antrorsum angustato ad apicem trans- 

 versim paulo impresso, elytris thorace latioribus ad basin truncatis, latitudine sesqui longiori- 

 bus, humeris paulo rotundatis, striis punctatis, interstitiis confertim punctulatis ; antennis 

 nigris, articulo 3io secundo fere duplo longiore. Long. 27; lat. elytrorum 11. 



One specimen, Shoalwater Bay, Dr. Cooper. The scales are nearly all removed by the 

 spirits in which it was preserved. 



HYLOBIUS Germ. 



HJ taeniatus, elongatus, ater opacus, tenuiter flavo-pubescens, rostro 5-sulcato, ad apicem 

 latiore, thorace inaequali grosse valde punctato, latitudine vix longiore, lateribus late rotun 

 datis, irregulariter late canaliculate, et antrorsum vago impresso ; elytris thorace sesqui latiori 

 bus, ad basin subtruncatis, punctis magnis quadratis striatim positis, interstitiis granulato-punc- 

 tatis, quinto macula ad quadrantem, alteraque ad dodrantem flavo-pilosis, macula subhumerali 

 scutelloque flavo-pilosis ; antennis elongatis, femoribus, muticis. Long. 53. 



One specimen, Vancouver, Colonel McCall. The middle groove of the rostrum commences 

 in a fovea between the eyes, and extends to the apex ; the lateral grooves are in front of the 

 eyes, they are broad behind, and gradually narrowed anteriorly, vanishing a little beyond the 

 middle ; the intermediate grooves are vague and anterior. The antennal grooves extend to the 

 inferior part of the eyes, and are deep ; the two basal joints of the funiculus are elongate, the 

 second is one-half longer than the first, and twice as long as the third. This species cannot be 

 a Hylobius, but I do not know where to place it ; and while the family of Curculionidae is in 

 such inextricable confusion as has been produced by the generic descriptions of Schonherr, it is 

 absurd to establish any other genera, except upon the most remarkable characters. The 

 characters, however, seem to be nearly those of Geonemus. 



H. torpidus, ater, capite cum rostro confertim punctato, hoc subtiliter carinato, ad apicem 

 incrassato, thorace profunde canaliculate, latitudine baud longiore subrotundato, rude rugose 

 punctato, interstitiis punctatis, elytris connatis ovalibus, postice perpendiculariter declivibus, 

 thorace baud sesqui latioribus, dense nigro-squamosis, breviter setulosis, punctis magnis oper- 

 culatis striatis, postice versus latera squarnulis luteis variegatis ; femoribus muticis, tibiis 

 anticis curvatig intus serratis. Long. *3 32. 



