18 PROCEEDINGS OF THE NATIONAL MUSEUM vol.65 



nearly square, flat, and broadly rounded behind. Elytra feebly con- 

 vex, about as wide as'the pronotum at base ; humeral angles broadly 

 rounded; base strongly angulated; sides slightly arcuately expanded 

 behind the humeral angles, rather strongly sinuate at the posterior 

 coxae, nearly parallel to the apical third, then arcuately attenuate to 

 the tips, which are rather acutely rounded, lateral margins coarsely 

 dentate posteriorly, the teeth irregularly placed and very variable in 

 size; humeri feebly developed; each elytron with 10 longitudinal 

 rows of deep round punctures, which are about equal distance from 

 each other and separated by narrow longitudinal costae, of which 

 the second and fourth are more distinct and strongly elevated than 

 the others, there is also an additional row of punctures extending 

 from the base to near the middle, and separated from the sutural 

 row by a short scutellar costa, which is as strongly elevated as the 

 second and fourth costae, the costae Avith numerous large, round, 

 shallow punctures, which are irregularly placed toAvard the side of 

 the costae, becoming more numerous toward the sides and at the 

 apical region, and in the center of which is a minute round elevation 

 bearing an obsolete hair. Abdomen beneath sparsely and rather 

 coarsely punctate, becoming feebly scabrous at the sides of basal 

 segments, and clothed with moderately long, recumbent cinereous 

 pubescence, the hairs sparsely placed on median parts but becoming 

 much denser at the sides, the intervals nearly smooth, and moder- 

 ately shining; first segment moderately convex and without a 

 densely punctured and pubescent median spot; last segment rather 

 narrowly rounded at apex. Prosternum moderately convex, the 

 surface sparsely, coarsely punctate, and sparsely clothed with long 

 fine erect hairs; anterior margin broadly rounded, w^ith a feeble, ar- 

 cuate emargination at the middle, on each side of which the margin is 

 rather strongly elevated; prosternal process short, very broad, 

 feebly convex, with distinct marginal grooves and with the lateral 

 margins narroAvly flattened and granulose, the sides parallel to the 

 posterior part of the anterior coxal cavities, where they are trans- 

 versely narrowed, with the apex broadly rounded. 



Length, 17 mm.; width, 5.75 mm. 



Tyfe locality. — Mangrove Cay, Andros Island, Bahamas. 



Type. — Coll. Amer. Mus. Nat. Hist. 



This species is described from a single female collected at the 

 type locality during May or June, 1917, bj' William M, Mann. 



It is one of the most slender species of the genus and can be readily 

 separated from all other Polycesta found in the West Indies by the 

 coloration, and by the posterior angles of the pronotum being broadly 

 rounded and not fitting closely to the base of the elytra. 



