118 MISC. PUBLICATION 6 9 8, U. S. DEPT. OF AGRICULTURE 



side at base of labrum; labrum short, transverse, densely ciliate in 

 front with long, yellow hairs; mandibles simple in both sexes, at- 

 tenuate toward apices; eyes large, oval, globose, strongly projecting. 

 Antenna short, 10-segmented, densely clothed with long hairs; first 

 and second segments robust, elongate, the first arcuate and much 

 longer than second ; third to seventh segments small, transverse, com- 

 pact, united shorter than first; last three segments forming a large, 

 loose club, with numerous small, round, sensory depressions on each 

 surface, the eighth and ninth segments irregularly oblong, and tenth 

 narrowly elongate, longer than ninth. Pronotum strongly convex, 

 emarginate or truncate in front, truncate or sinuate at base, dentate 

 anteriorly, not transversely depressed behind anterior margin; sides 

 not margined. Scutellum small, subtriangular, truncate at apex. 

 Elytra strongly convex; lateral submargins on apical declivity very 

 strongly elevated at apices ; each elytron trituberculate along anterior 

 margin of apical declivity. Legs short, subequal in length; tibiae 

 expanded toward apices, dentate on exterior margins, each with a 

 large, arcuate spine at apex; posterior tarsi as long as tibiae, apical 

 segment of each shorter than preceding four segments united. Ante- 

 rior coxae contiguous. Middle coxae narrowly separated. Intercoxal 

 process of abdomen lamellate. Body short, cylindrical. 



Genotype. — Xylopertha hexacantha Fairmaire. (Present des- 

 ignation. ) 



Lesne (1901) erected Xyloprista for Xyloprista arcelJata new spe- 

 cies, Xylopertha praemorsa Erichson, and Xylopertha hexacantha 

 Fairmaire without designating a genotype. All of these species are 

 found in the warmer parts of South America. 



Xyloprista hexacantha (Fairmaire) 



Xylopertha hexacantha Fairmaire, 1S92, Soc. Ent. de Belg. Ann. 36: 245. 

 Xyloprista hexacantha Lesne, 1901, Soc. Ent. de France Ann. (1900) 69 : 499, 501- 

 502, figs. 285, 291 ; 193S, in Junk (pub.), Coleopt. Cat, pt. 161, p. 55. 



Male. — Uniformly reddish brown or brownish black, the antennae, 

 palpi, and posterior margins of abdominal sternites brownish yellow, 

 legs reddish. 



Head moderately convex, with two to four distinct tubercles on 

 front, densely, coarsely granulose, and sparsely clothed with long, re- 

 cumbent and erect, whitish hairs on front, with short, longitudinal, 

 parallel costae on occiput ; clypeus finely, transversely rugose or granu- 

 lose ; clypeal suture not distinct. 



Pronotum slightly wider than long, widest at middle ; sides broadly, 

 arcuately rounded, more strongly converging anteriorly, with a small, 

 broad tooth at apical angles; posterior angles broadly rounded; sur- 

 face sparsely clothed with short, recumbent, inconspicuous hairs, very 

 finely, sparsely punctate at sides on basal half, finely, densely imbricate- 

 punctate at middle on basal half, rather densely, irregularly dentate 

 on apical half, the teeth broad, semierect, variable in size, and rasplike, 

 with a few larger teeth toward apical angles. 



Elytra at base slightly narrower, or subequal in width to pronotum 

 at middle ; sides parallel, or vaguely expanded posteriorly, angularly 

 separated at apices; surface nearly glabrous on basal half, sparsely 

 pubescent toward apical declivity, densely clothed with short, recum- 

 bent, brownish hairs on apical declivity, densely, coarsely punctate on 

 basal two-thircls, more shallowly punctate on apical declivity ; humeral 



