DYNASTIN.E 121 



but rather coarsely punctato-rugulose, the angles rounding very 

 broadly almost to the base, the sinus subobsolete; suture fine but 

 distinct, nearly rectilinear; prothorax wholly devoid of maculation, 

 excepting the sublateral dark dot, not quite twice as wide as long, 

 formed nearly as in lucida but with much more broadly rounded 

 basal angles and shallower apical sinus, the bottom of the sinus 

 arcuate and not transverse as it is in lucida, the acute apical angles 

 very much shorter than in that species; sparse punctures much larger 

 and deeply impressed throughout, each bearing a rather long stiff 

 erect hair; scutellum more acutely ogival, with rather large scattered 

 punctures basally; elytra similar in form and not obviously wider 

 than the prothorax but a little shorter, only a fifth or sixth longer 

 than wide, the punctures rather less fine and not quite so sparse, 

 with the short erect hair arising from each much more evident; 

 maculation differing in having the subscutellar spot obliquely 

 divided, forming two spots; pygidium (cf ) much less convex, more 

 transverse, more shining and with much less abundant, as well as 

 shorter and stiffer, hairs than in the male of triangnlifer, but prob- 

 ably more closely resembling the male of lucida in those features; 

 abdomen loosely punctured throughout as usual in this section. 

 Length (cf ) 20.0 mm.; width 10.3 mm. Chiriqui. 



*costaricana n. sp. 



10 Body narrow and elongate-oval, convex, shining, pale brownish- 

 flavate in color above and beneath, the legs pale as usual in this 

 section; two pronotal spots moderate to small, sometimes altogether 

 obsolete; head deep black, sparsely and irregularly punctate, the 

 clypeus red, more coarsely but very shallowly, rather loosely punc- 

 tato-rugulose, similar in the sexes, less than twice as wide as long, the 

 sides rather rapidly converging and broadly arcuate from the base, 

 the angles broadly rounded and the sinus very feeble, all the edges 

 sharply but finely reflexed and blackish; prothorax two-thirds (cf ) 

 to four-fifths ( 9 ) wider than long, the sides strongly, evenly rounded, 

 more converging apically, the angles prominent and very sharp 

 throughout, nearly as in triangnlifer but less transverse, with the 

 middle of the apical sinus much more prominent and rounded, and 

 the erect hairs visible in the male extremely short; scutellum nearly 

 similar, blackish, with a pale streak parallel to the edges; elytra 

 nearly as in triangulifer , except that all the spots are very small, 

 the form also is narrower and the short arcuate shelf under the lateral 

 swelling of the female less broad; pygidium (cf) more elongate, 

 more convex, less punctate and with fewer erect hairs, or ( 9 ) much 

 smaller, less transverse and very much nore acutely rounded at tip, 

 though nearly similar in sculpture and in the rather sparse erect 

 hairs; legs, tarsi and under surface nearly similar. Length (c? 9 ) 

 18.5-20.5 mm.; width 8.0-10.0 mm. Mexico (Guerrero), Baron. 

 Five examples *circulifer n. sp. 



II Body oblong-oval, rather less convex, strongly shining, dark brown- 

 ish-rufous above, piceo-rufous beneath, the legs black throughout; 

 head black throughout, slightly more than half as wide as the pro- 

 thorax, sparsely and rather feebly punctate, with a median impunc- 



