120 DESCRIPTIONS OP NEW SPECIES. 



necting the labrum with the epistpma ; in the female the epistoma 

 is truncate, and the connecting membrane is invisible.* 



394. Rll. gracilis. Elongatus ater subnitidus, capite elongate, punc- 

 tulato, thorace laevi, latitudine vix breviore, antice fere truncate, lateribus 

 rotundatis tenuiter marginatis, basi bisinuata, medio margiiiata, angulis 

 anticis deflexis baud prominulis, posticis rectis retrorsum pvominulis ; 

 elytris elongato-ovalibus, convexis, thorace duplo latioribus, basi sub- 

 einarginati-s, hunieris subrotundatis, dorso striis utrinque 8 marginalique 

 punctulatis, parum iinpressis ; stria scutellari brevi fere obsoleta. Long. 

 72 -75. 



Cape San Lucas, Lower California ; Mr. Xantus. The thorax 

 is dull, impunctured, nearly truncate in front, with the apical 

 angles not prominent, the sides are rounded, and widened to a 

 little distance behind the middle, then narrowed to the base, 

 which is slightly sinuate near the hind angles: these are rectangu- 

 lar and somewhat prominent : the base is finely margined by a 

 slightly curved line extending to within a short distance of the 

 hind angles, and in front of this line a slight transverse elevation 

 is seen, anterior to which is a very vague transverse impression. 



In the male the antennce are longer than the head and thorax ; . 

 but in the female they are a little shorter and more thickened 

 externally. 



XYLOPINUS LEC. 



395. X. aenescens. Piceo-seneus nitidus, capite thoraceque sat dense 

 minus fortiter punctatis, hoc latitudine breviore parum eonvexo, apice 

 late emarginato, lateribus late rotundatis, tenuiter marginatis, basi truu- 

 cata marginata utrinque foveata, angulis anticis rotundatis, posticis 

 rectis, ante basin transversirn impresso ; elytris thorace latioribus, paral- 

 lelis, convexis, striis impressis punctulatis, interstitiis plauis, parce sub- 

 tiliter punctulatis ; antennis pedibusque concoloribus. Long. -50 -57. 



Mas, tibiis anticis ad medium latere interno obtuse dentatis, dein usque 

 ad apicem late emarginatis ; tarsis auticis et intermediis articulis 1-3 

 paulo dilatatis, subtus spongiosis. 



Femiua, tibiis anticis, tarsisque anterioribus simplicibus. 



Middle and Western States. Quite distinct from X. saper- 

 doides by the brassy lustre, the broader thorax, and by the trans- 



* Lacordaire (Gen. Col. V, 377) mentions sexual differences in the form 

 of the epistoma in certain species of Zophobas, which seem to be of a 

 similar nature ; but I do not know whether the basal membrane becomes 

 visible when the emargination is deep. 



