Brazilian Baring 3 21 



than in the preceding and more coarsely punctate, the intervals narrower, 

 with the fine median carina less developed; abdomen alutaceous, subim- 

 punctate, strongly and closely punctate and squamulose at apex, which is not 

 impressed in the male, which sex has a large medio-basal impression. Length 

 2.65-2.8 mm.; width 1.0-1.15 mm. Brazil (Chapada). March, October 



and November. Four specimens densa n. sp. 



Form and sculpture nearly similar but smaller and narrower, paler red-brown, 

 the vestiture similar; beak ( 9 ) longer, about as long as the prothorax, the 

 antenna; rather less ultra-median and with somewhat longer scape; prothorax 

 similar throughout, but almost as long as wide and with the parallel sides 

 extending a little farther beyond the middle; elytra similar, but with the 

 stria; slightly less coarse and more finely punctured, the interstitial cannules 

 more obvious; abdomen alutaceous, punctured at tip. Length 2.45 mm.; 

 width 0.85 mm. Brazil (Chapada— forest). August. One specimen. 



opaca n. sp. 



There is no other genus with which Psiona can be compared at 

 all closely; the, division made above defines two almost subgeneric 

 groups. 



Tribe Sonnetiini 



This tribe is founded upon a single genus, combining in a remark- 

 able way the anatomical characters of the Centrinini and Madarini, 

 and yet so different from either that it seems impossible to avoid 

 the tribal isolation here proposed for it. The sterna, being discon- 

 nected and with rather narrowly separated coxae, betray an affinity 

 with the former tribe and the long, greatly exposed and gently 

 sloping pygidium, very similar to that of Conoproctus, when con- 

 sidered with the sternal structure, presents a singularly incongruous 

 combination. The only genus is the following: 



Sonnetius n. gen. 



The body in this genus is very elongate-suboval and feebly 

 convex, with nearly glabrous shining integuments. The beak is 

 very long, slender and feebly arcuate in the female, but much 

 shorter in the male, not separated from the head by an impression 

 and with porrect, internally straight, basally inflated and obliquely 

 acuminate mandibles, coming together along the inner edge as in 

 Centrinaspis. The antennae are medial {&), or far behind the 

 middle (9), rather short, the scrobes feebly oblique, the scape 

 moderate, elongate-clavate at tip and far from attaining the base, 

 the first funicular joint as long as the next three, the second as long 

 as the succeeding two, the rest short but increasing only slightly in 

 thickness, the club stout, with rather short glabrous basal segment, 

 the remainder forming a regular and almost straight-sided, sharply 

 pointed and densely pubescent cone, the sutures distinct. The 

 prosternum is unmodified or feebly concave, separating the coxae by 

 T. L. Casey, Mem. Col. X, Oct. 1922. 



