116 LENG AND HAMILTON. 



The pattern of the elytral markings in the present genus and in 

 Lagocheirus are the same, and in both genera the sixth joint of the 

 antennae is prolonged inwards in the male sex. 



I.El»TOSTYL,lTS LeConte. 

 The species which comprise this genus resemble very closely those 

 of the following genus, but may be known by the form of the lateral 

 tul)erc]e of the thorax, which is, in every species, very obtuse. 



Elyti-a witli asperities or tubercles bearing at their summits short, black, scale- 

 like hairs A. 



Elytra without asperities and scale-like hairs B. 



B. Presternum as wide between the coxse as the width of a coxal cavity ; elytra 



slightly truncate at tip uiaciila. 



Prosternum narrower than a coxal cavity ; tips of elytra separately rounded. 

 Thorax spareely punctured, the flanks at middle without punctures. 



perple.'Kus. 

 Thorax moderately densely punctured, the flanks as densely punctured 



as the disc collari!>i. 



\. Thorax densely punctured; elytra with densely placed, coarse, deep punc- 

 tures sesgiittatiiN. 



Thorax not densely punctured ; elytral punctures not closely placed, often 

 inconspicuous or concealed. 



Legs hairy, anteunse slightly pilose beneath albidtis. 



Legs not hairy, antennae not pilose. 



Surface of thorax not tuberculate, even, punctures regularly placed. 

 Elytra very indistinctly punctured, especially at apex, the disc with 

 angulate fascia behind the middle, the apices feebly obliquely 



truncate biustUM. 



Elytra distinctly punctured over the entire sui'face, disc with acutely 

 angulated fascia, apices slightly prolonged not obliquely truncate. 



parvus. 



Elytra more distinctly punctured near the apex than at base, apices 



very obliquely truncate, disc with arcuate fas(;ia at the declivity 



arciiatuiii. 

 Surface of thorax more or less tuberculate, and with the punctures ir- 

 regularly ])laced and rugose. 

 Elytra feebly or not Toughened with acute tubercles, antcnnie in both 

 sexes longer than the body, the joints three and four together 

 not longer than 5-7 taken together. 

 Tips of elytra not prolonged, apices separately rounded ; thorax 



with rather strong discal tubercle iit'bulosiis. 



Tips of elytra obliquely prolonged, apices obliquely truncate, thorax 

 with very flat tubercles. 

 Elytra without rows of tubercles, a few only near the base, post- 

 humeral oblique impression very feeble; hind trochanters of 



% slightly pi-olonged plaiiidoi'sus. 



Elytra with four distinct discal series of ol)tuse tul)orck's, i)ost. 

 humeral oblique impression well marked ; hind trochanters 

 of % not prolonged. 



