378 PROCEEDINGS OF THE ACADEMY OP 



R. approximatus, linearis, minus convexus, piceus nitidus, capite 

 rufescente sat dense, thorace fortiter minus dense pnnctatis, hoc latitudine 

 baud longiore, lateribus late rotundatis, angulis omnibus rotundatis, margine 

 apicali basalique rufescente ; elytris lateril>us parallelis, apice late rotunda- 

 tis, striis e punctis majoribus approximatis compositis, hie inde subimpressis, 

 suturali postice impressa, interstitiis subrugosis ; subtus rufo- piceus, antennis 

 pedibusque piceo-ferrugineis. Long. 3 mm. 



One specimen from New York given me by Mr. Ulke. Larger than the 

 next, wiih the thorax broader, and the punctures of the striae of the elytra 

 much more closely placed. This species agrees with the description of the 

 Russian American R. scalpturatus Mann., Bull. Mosc, 1852, 362, but on 

 account of the difference in locality it is unsafe at present to regard them as 

 identical. 



R. re mot us, linearis, modice convexus, nigro-piceus nitidus, capite sat 

 dense, thorace fortiter minus dense punctato, hoc latitudine vix longiore, 

 lateribus late rotundatis, angulis omnibus rotundatis ; elytris lateribus sub- 

 parallelis, apice late rotundatis, striis baud impressis, e punctis majoribus 

 remotis compositis, suturali postice profunda, interstitiis laevibus ; subtus 

 rufo-piceus, antennis pedibusque piceo-ferrugineis. Long. 2-5 mm. 



Several specimens of this species were collected by Mr. Ulke in the moun- 

 tainous portion of central Pennsylvania. 



LASCONOTUS Er. 



L. laqueatus, linearis, depressus, nigro piceus, opacus, subtilissime 

 punctulatus, capite utrinque oblique impresso, impressionibus postice conni- 

 ventibus, medio subcarinato, thorace latitudine paulo longiore, lateribus 

 parallelis postice rotundatis, disco excavato, costa utrinque elevatanec apicem 

 nee basin attingente, antice hamo elevato inclusa; elytris sutura, costis utrinque 

 tribus, quartaque interna basali brevi anguste elevatis, interstitiis subtiliter 

 biseriatim punctatis. Long. 3 mm. 



One specimen; Arizona, Dr. Coues. Intermediate in size between L. com- 

 plex and L. pusillus, and quite different from both by the characters 

 above detailed. The discoidal costae of the thorax are separated by a wide 

 excavation, as usual, and do not attain either the base or the apex; in front 

 they are surrounded by a deep impression, limited by a hook-shaped elevated 

 line, the outer leg of which is a little longer. 



L. simplex, valde elongatus, cylindricus, piceus, opacus, pilis parcis 

 obsitus, capite antice late biimpresso, medio vix elevato, thorace punctato, 

 latitudine fere sesqui longiore, lateribus parallelis tenuiter marginatis, angulis 

 omnibus rotundatis, disco late sulcato, lineis elevatis solitis fere obssletis ; 

 elytris sutura costisque utrinque quatuor elevatis, interstitiis biseriatim cri- 

 bratis. Long. 2-5 mm. 



One specimen from Cape San Lucas, Lower California; Mr. Xantus. Easily 

 known by the cylindrical form, and the almost obsolete sculpture of the tho- 

 rax ; the usual discoidal costae and the hook-formed elevations surrounding 

 their anterior extremity can be barely traced. The four costae of the elytra 

 are acutely and equally elevated, and the intervals each marked with two 

 rows of quadrate punctures. 



AULONIUM Er. 



Au. Ion gum, elongatum, ferrugineum, nitidum, vertice subtiliter bitu- 

 berculata, thorace punctulato latitudine longiore, punctulato, utrinque pro- 

 funde bistriato, a basi ad medium irregulariter biseriatim punctato, antice late 

 excavato, vage bituberculato, et utrinque costato ; elytris pone medium piceis, 

 punctulatis, striis subtiliter punctatis, baud impressis. Long. 4-75 5-5 mm. 



Arizona, Dr. Coues. This species is as elongate as Au. tuberculatum, 



[Dec. 



