DASTDACTYLUS. 17 



4. Dasydactylus lsevicollis. 



Nigro-subaeneus, corpore subtus cum pedibus rufo-piceis, genibus, tarsis et antennis nigro-caeruleis ; capite fere 

 laevi, prothorace oblongo, minute crebre punctato, his cseruleo-micantibus ; elytris punctato-striatis, 

 interstitiis crebre et confuse punetulatis, apicibus sublsevibus, rotundatis, et minute denticulatis ; prosterno 

 truncato, apice parum depresso. Long. 10-12 millim. S $ • 



Mas pedibus praesertim anterioribus longis ; femoribus tibiisque anticis et intermediis intus asperatis ; tarsis 

 anticis birtulis, crinibus aureis. 



Sab. Mexico, Toxpam, Cordova {Salle). 



The head and thorax are very minutely and obsoletely punctured (so as to appear 

 almost glabrous under an ordinary lens of an inch or longer focus), and bluish in tint. 

 The thorax is oblong, narrow in front ; the sides in the male are slightly rounded, in the 

 female nearly straight ; the base is wider than the front in both sexes, and has in the 

 middle a faint transverse depression along which are a few larger punctures, the margin 

 very finely reflexed, the striolae indicated by punctiform impressions. The elytra are 

 decidedly wider at the shoulders than the thorax, blackish-bronze in colour, and thickly 

 and confusedly punctured, the punctured striae being distinct towards the base, but 

 confused with the interstitial punctuation towards the apex. 



The form of the prosternum, or rather of its intercoxal process, is very important in 

 distinguishing the species of this genus : in this insect it is slightly arcuate, and the 

 apex (this part being less depressed than in some allied species) is truncate, or at all 

 events very slightly emarginate ; it is also smooth. The antenna? are moderately long ; 

 the third, fourth, and fifth joints elongate, the sixth shorter than those preceding, but 

 still longer than the seventh, the latter triangular in shape ; these joints are all more 

 or less shining, bluish-black, while the club is black and opaque, the latter being rather 

 laxly articulated but still wide. The tarsi are clothed beneath with soft golden hair, 

 which is longer in the male in the front pair. 



5. Dasydactylus puncticeps. 



Nigro-aeneus, nitidus, corpore subtus pedibusque rufo-piceis, antennis tarsisque nigris ; capite fortiter parcius, 

 prothorace minus fortiter sed crebrius, punctatis; elytris crebre disperse punctatis, vix striatis, apicibus 

 acuminatis et subtiliter denticulatis. Long. 11-15 millim. $ $ . 



Mas prothorace convexiore, postice latiore ; femoribus et tibiis anticis et intermediis asperatis. 



Eab. Mexico, Toxpam (Salle). 



Head thickly and strongly punctulate, the crown less thickly so ; orbital striolee well 

 pronounced, scarcely diverging from the eye behind. Thorax trapezoidal, but con- 

 siderably narrower in front than at the base; densely but finely punctured (not 

 alutaceous as in J). bwprestoides) ; base rather widely and flatly depressed as far as the 

 punctiform impression. Elytra in large specimens narrowed behind (as in D. bupres- 

 toides), in smaller ones less distinctly so ; densely punctate ; the punctures in one small 

 male, at least at the base, indicate striae, but in larger specimens they are very evenly 

 dispersed, in the single female example they form striae ; the apices are not truncate, 



biol. cente.-amee., Coleopt., Vol. VII., September 1887. D* 



