2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 80 



margin of pronotum, nearly twice as long as the third joint, which 

 is slightly longer than the fourth; apical joints longitudinally ru- 

 gose, the eleventh joint distinctly longer than the tenth. 



Pronotum nearly twice as wide as long, distinctly narrower at 

 apex than at base, and widest at base; sides nearly parallel poster- 

 iorly, arcuately narrowed anteriorly, and strongly, regularly spi- 

 nose; disk moderately convex and uneven; surface finely, conflu- 

 ently punctate, sparsely clothed with short, inconspicuous pubes- 

 cence, and ornamented on each side of middle with an irregularly 

 shaped, smooth area, which is acutely produced anteriorly, and with 

 two very narrow, more or less distinct, smooth spots on each side 

 toward lateral margin. Scutellum strongly transverse, broadly 

 subtruncate at apex, surface densely punctate, sparsely clothed with 

 short, recumbent, yellowish- white pubescence, and with a narrow, 

 longitudinal, median, smooth vitta. 



Elytra five times as long as pronotum, and at base subequal in 

 width to the pronotum at base; sides parallel or vaguely expanded 

 at middle, tips separately, broadly rounded, each with a small tooth 

 at sutural margin; surface vaguely rugose, feebly, finely, densely 

 punctate, with a few coarse punctures intermixed, densely clothed 

 with very short, recumbent, whitish pubescence, which nearly con- 

 ceals the surface, and each elytron with two vague, longitudinal 

 costae, extending from base to apical fourth. 



Abdomen beneath feebly, finely, sparsely punctate, sparsely clothed 

 with short, recumbent, whitish hairs, posterior margin of each seg- 

 ment smooth, and glabrous at middle ; last segment broadly, feebly, 

 arcuately emarginate at middle. Prosternum finely, confluently 

 punctate, and nearly glabrous; prosternal process rather narrow, 

 arcuately expanded behind the coxal cavities, and rounded at apex. 

 Legs long, scabrous, especially the anterior pair; femora more or less 

 serrate on inner margins ; anterior tibiae slightly arcuate, and armed 

 with numerous asperities on undersides. 



Length, 78-85 mm. ; width, 28-30 mm. 



Type locality. — Santiago, Dominican Kepublic. 



Other locality. — San Pedro de Macoris, Dominican Eepublic. 



r^/pe.— U.S.N.M. No. 43705. Collected in 1926 by Giuseppe 

 Russo. 



Paratype. — In American Museum of Natural History. Collected 

 on the Conseulo Plantation, San Pedro de Macoris, Dominican 

 Republic, in 1919, by an officer in the American Army. 



Remarks. — Described from two males (one the type). 



This species resembles Xixuthrus costatus Montrouzier, described 

 from Woodlark Island, but it differs from that species in having 

 the antennal tubercules more narrowly separated, pronotum finely, 



