26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



ately constricted at middle, then broadly arciiatelj' expanded at apical 

 third, and finally obliquely attenuate to the tips, which are conjointly 

 broadly subtruncate, with the lateral margins entire; humeri mod- 

 erately developed; each elytron with a rather broad, deep basal 

 depression, with a distinct feebly arcuate lateral carina extending 

 from the humerus to middle of elytron, and with the suture strongly 

 elevated from basal fourth to apex ; surface coarsely, densely granu- 

 lose, with a few obsolete punctures, which have a tendency of form- 

 ing rows on the disk, and clothed with a few veiy short inconspicuous 

 hairs. Abdomen beneath finely, densely granulose, with a few obso- 

 lete punctures intermixed, and sparsely clothed with very short, in- 

 conspicuous hairs. 



Length, 4.5 mm. ; width, 1.1 mm. 



Type locality. — Rio Mapiri (near mouth), Bolivia. 



OtJier localities. — Huachi (Beni River), Bolivia. 



Type arid paraty pes. —Cat. No. 26976, U.S.N.M. 



Described from six specimens, the type and two paratypes collected 

 during September, 1921, near the mouth of the Rio Mapiri, and 

 three paratypes collected during the same month at Huachi, on the 

 Beni River. 



PARAGRILUS OPACIPENNIS, new species 



Male. — Narrowly elongated ; head and pronotum dark aeneous, the 

 latter with the median part more aureo-aeneus, and moderately shin- 

 ing; scutellum and elytra black, strongly opaque, with the reliefs 

 more shining; beneath black, and more shining than above. 



Head feebly convex, not flattened behind the epistoma, but with 

 a rather broad, moderately deep longitudinal groove extending from 

 occiput to middle of front; surface glabrous, densely, obsoletely 

 granulose, and rather densely, coarsely punctate, the punctures 

 shallow, irregularly placed, and becoming somewhat confluent and 

 transversely rugose behind the epistoma; antennal cavities nearly 

 contiguous; epistoma broadly, but feebly arcuately emarginate in 

 front. Pronotum feebly, regularly convex, one and one-third times 

 as wide as long, apex and base about equal in width, and widest at 

 apical third; sides when viewed from above arcuately expanded 

 from anterior angles to apical third, where they are obtusely 

 rounded, then strongly obliquely attenuate to the posterior angles, 

 which are obtusely rounded; anterior margin bisinuate, with the 

 median lobe broadly rounded; base deeply arcuately emarginate on 

 each side, with the median lobe moderately produced and broadly 

 subtruncate in front of scutellum; surface with two broad, rather 

 deep depressions on each side, one near the lateral margin at apical 

 third, the other in front of the basal emargination, densely, coarsely 

 granulose, especially near the posterior angles, and very strongly, ir: 



