100 DESCRIPTIONS OF NEW SPECIES. 



TRIGONOGENIUS Soliek. 



340. T. farctus. Obesus, convexus, Diger, pube sordida depressa 

 sericea undique dense vestitus, setisque elongatis nigris pilosellus, 

 thorace latitudine vix breviore, lateribus medio dilatatis, postice sinua- 

 tis, basi late rotundata, convexo, insequali, profunde late canaliculato ; 

 elytris dorso antiee parum convexis, ventricosis, tborace plus duplo 

 latioribus ; antennis pedibusque obscure ferrugineis. Long. '12. 



Three specimens, from San Francisco, California, given me by- 

 Mr. Ulke. The thorax is convex, dilated on the sides, somewhat 

 coarctate behind, with a very deep dorsal furrow, and faint im- 

 pressions each side of it ; the elytra are scarcely longer than their 

 width, convex and much deflexed behind, but not very convex in 

 front. 



SIIVOXYLON Duftsch. 



350. S. quadrispinosum. Cylindricum nigrum, capite punctato, 

 postice rugoso, thorace latitudine paulo breviore, lateribus fere parallelis 

 antiee paulo rotundatis, apice medio recte truncato, postice fere laevi 

 piceo-rufo, antiee exasperato nigro; elytris subseriatim punctatis, antiee 

 piceo-rufis, postice nigro-piceis, fortius punctatis, flavo-pubescentibus, 

 dein declivibus, fere laevibus et spinis obtusis conicis duabus utrinque 

 armatis ; antennis pedibusque flavis. Long. -15. 



Two specimens, collected at Cape San Lucas, Lower California, 

 by Mr. Xantus. Much smaller than the Texan S. sericans, and 

 with the tubercles of the posterior declivity much more promi- 

 nent ; the punctuation of the elytra is also entirely different, the 

 thorax is nearly smooth behind, and the anterior asperities are 

 fewer and more prominent. The front is not concave. 



S. asperum Lee. and S. ^-tuberculatum Lee. were also found 

 by Mr. Xantus in Lower California. 



BOSTRICIIIJS Geoffr. (emend. Guerin). 



351. B. armiger. Elongatus cylindricus, niger opacus, pilis sordidia 

 irregulariter vestitus, thorace latitudine breviore fortiter granulato, 

 postice subtiliter canaliculato, antiee bicornuto et serrato, lateribus 

 rotundatis postice subsinuatis, angulis posticis rectis ; elytris rude fere 

 confuse punctatis et granulatis, apice convexis. Long. *30 — # 40. 



Mas, elytris spina parva subsuturali armatis. 

 Femina, elytris apice singulatim rotundatis. 



Middle and Southern States. Differs from what I regard as 

 B. serricollis, by the elytra not having two elevated costse, 



