460 REVISION OF the elaterida: 



elytris a basi subangustatis, striis punctulatis, interstitiis confertini rugose punctulatis, antennis arti- 

 culis 2 et 3 subcylindricis, 4 to coniunctis non longioribus. Long. "43. 



One specimen, Pennsylvania. The narrow arched body, narrowed at each end, with 

 the thorax fitted closely to the elytra, give this species very much the appearance of some 

 of the Eucnemides; (he front is more convex than in the other species, and is almost 

 angulated at the tip. The lobe of the third tarsal joint is very long, extending to the 

 middle of the last joint; the outer margin of the plates of the posterior coxa? is oblique, 

 and the posterior margin also a little oblique inwards, and they unite in an obtuse angle not 

 prominent, but scarcely rounded. The thorax has a short furrow at the middle of the 

 disc, which is possibly accidental ; the carina? of the posterior angles diverge very much 

 from the margin. 



2. A. recedens, latiusculus, fusco-niger, sovdiile pubescens, thorace latitudine fere breviore, an- 

 trorsum angustato, lateribus rotundatis, subtilius punctato (punctulis paucis intermixtis,) angulis pos- 

 ticis modice productis acutis, elytris parallejis postice rotundatis, striis punctatis, interstitiis planis 

 rugose punctulatis, antennis articulis 2 et 3 subcylindricis, 4 ,u coniunctis vix longioribus. Long. -2 — -24. 



San Francisco. The smaller sized individuals appear to be more densely pubescent, 

 and the punctures of the thorax appear more distinct; — they do not, however, seem to 

 be specifically distinct. The sides of the thorax are more rounded anteriorly than at the 

 base, but are not straight at any part; the carina diverges very much from the margin, 

 as in the preceding, and the front is moderately convex and slightly angulated. The lobe 

 of the third joint of the tarsi does not reach quite to the middle of the fifth joint. 



To this genus may possibly be referred Cryptohypnus cinereipennis Man. (Monocrepi- 

 dius cinereipennis Esch.) and C. puberulus Man. (Bull. Mosc. 1843, p. 240;) of which the 

 fourth tarsal joint is said to be lobed. The difficulty of determining whether the lobe pro- 

 ceeds from the third or fourth joint is sometimes very great. At all events the species 

 alluded to cannot be retained in Cryptohypnus, and a new examination is necessary to fix 

 their true affinity. 



Brachycrepis Lee. 



Frons convexa, antice vix producta, rotundatim marginata, non impressa: labrum antice rotunda- 

 tum: antenna; valde serratae, articulo l m0 medioori, 2''° parvo, 3'° sequenti requali, 11"'° prrecedenti 

 non longiore, simplici: prosternum antice lobatum, mucrone postico subinflexo, sutura laterali paulo 

 concava, antice excavata: mesosternum non protuberans, coxre posticre laminis intus subito quadran- 

 gulariter valde dilatatis, margine postico subsinuato, dente interno modiocri, acuto: tarsi pubescentcs 

 articulo l mo sequentibus coniunctis icquali: 2 ml ° plus duplo breviore, subtus vix lobato, 3'° brevi, sub- 

 tus breviter lobato, 4'° parvo recepto, 5'° 2 ndo sequali, unguiculis integris. 



The lobe of the third joint of the tarsi does not extend beyond the fourth joint. This 

 genus differs from Dicrepidius by the more sudden dilatation of the coxal plates, as well 

 as by the structure of the tarsi; from Anchastus, it is readily known by the distinctness 

 of the outer angle of the coxal plate (the posterior margin of which is not oblique inwards, 

 but slightly emarginate,) and by the structure of the antenna? and tarsi. The posterior 

 angles of the thorax have two acute carina?, one parallel with the margin as in Dicrepidius, 

 the other diverging as in Anchastus. 



