io6 MEMOIRS ON THE COLEOPTERA 



not in the least blunt, the apical but little produced beyond the median 

 part of the broadly arcuate apex, which becomes sinuate laterally; base 

 without marginal bead, the apex with a bead only near the sides; surface 

 evenly convex, with rather small but strong, sparse punctures, equally 

 distributed throughout; scutellum broadly ogival and very obtuse, 

 punctured except peripherally and at the middle; elytra a third longer 

 than wide, rounded in posterior two-fifths, equal in width to the prothorax 

 and less than three times as long, parallel at the sides; surface with strong 

 and rather confused loose sculpture, the punctures in large part linearly 

 arranged, especially toward the suture; pygidium with coarse transverse 

 strigose sculpture, having short white pubescence laterally; tarsi albido- 

 pilose beneath. Length (cf ) 9.8 mm.; width 4.8 mm. Costa Rica. 



The only species known to me from near the habitat of this 

 species is femoratus Burm., and this, as figured in the Biologia, 

 is very much stouter. The hind femora in the above type are not 

 modified, although it seems to be a male. 



*Leucothyreus bakeri n. sp. Body stout, oval, very convex, glabrous, 

 very shining, black, with evident metallic lustre, varying from obscure 

 to brighter subcupreous, the under surface rufo-piceous, with very small 

 sparse decumbent hairs laterally and throughout on the posterior coxae, 

 the legs darker, with bright greenish-metallic lustre; head large, evenly 

 and moderately convex, finely, sparsely punctate, more densely at the 

 extreme base; clypeus more than twice as wide as long, subtrapezoidal, 

 broadly arcuato-truncate at apex, with broadly rounded angles and with 

 rather stronger punctures than on the head, sparse medially, dense later- 

 ally, the edges all finely and abruptly reflexed, the suture fine, transverse, 

 distinct throughout; eyes well developed, convex and prominent; pro- 

 thorax transverse, rather more than twice as wide as long, the sides 

 broadly arcuate, converging apically, subparallel basally, the basal angles 

 obtuse and rounded, the apical projecting well beyond the median trans- 

 verse part of the apical sinus; surface evenly convex, with small but strong, 

 sparse punctures equally distributed throughout; base not beaded but 

 with a rather strong median lobe; scutellum nearly as in the preceding; 

 elytra about a fourth longer than wide, slightly inflated behind, at base 

 fully as wide as the prothorax, posteriorly much wider, fully three time? 

 as long as the prothorax, having even coarse impressed striae, which are 

 finely, confusedly and closely punctate; pygidium with coarse deep strigose 

 sculpture, becoming upwardly oblique in direction laterally, coarsely 

 punctate medio-basally and with minute white hairs apically toward the 

 sides: anterior and middle tarsi densely albido-pilose beneath, the pos- 

 terior compressed and with few longer hairs; larger claw of all the tarsi 

 cleft; anterior tibiae only bidentate externally, the posterior feebly surate. 

 Length (9) 12.3-13.0 mm.; width 7.2-8.0 mm. Brazil (Para), C. F. 

 Baker. 



The pronotum along the base laterally is feebly impressed, some- 

 what as in cephalotes and others of this genus, but the oval form of 



