76 RHYNCHOPHORA. 
punctures, the two series being separated at the base by a broad, median, smooth space 
which soon narrows into a carina. The abdomen is feebly impressed for all the length 
of the two very polished and long basal segments. There is no trace of a femoral 
lamina, but on the underside of the femora near the base there is a remarkably definite 
channel; in WV. guatemalensis this is only indefinite. On the upper surface the quite 
evident, though fine, series of punctures on the elytra are sufficient to distinguish 
JN. deplanatus from its congener. 
5. Nemocephalus puncticeps, sp. n. 
Piceus, minus nitidus ; capite dense punctato; elytris late profundeque unisulcatis, seriatim fortiter punctatis, 
interstitiis paululum elevatis. 
Long. ¢ 17-28 millim., 2 16-18 millim. 
Hab. Mexico (Sallé), Cerro de Plumas (Hége), Temax in North Yucatan (Gawmer) ; 
British Honpuras, R. Sarstoon (Blancaneaux); GuaTEMALA, Teleman (Champion) ; 
Nicaraeua, Chontales (Belt, Janson); Panama, Bugaba, Volcan de Chiriqui (Champion). 
Male. Upper surface of the head and rostrum with numerous very evident punctures, 
shining. ‘Thorax dull, distinctly punctate. Elytra with series of large punctures 
closely placed, so that both the longitudinal and transverse interstices are narrow and 
somewhat elevated. The sculpture of the under surface of the head is at the base, 
close to the neck, remarkably rugose and deep, so that the central fovea is rendered 
indistinct ; it, however, exists rather remote from the base, with which it is connected 
by a fine channel; anterior to this the punctuation is dense and coarse but not rugose, 
set with numerous curvate sete, carinate along the middle. Basal abdominal segments 
deeply sulcate for all their length ; terminal segment with fine, rather long hair. 
Femora not impressed, abruptly clavate. 
Female with the upper surface of the head and metarostrum densely punctate; their 
under surface dull, somewhat velvety, and the coarse sculpture thus made somewhat 
indistinct. 
The South-American WV. obtusus, Lund, has a broad groove on the elytra, and 
resembles WV. puncticeps in appearance, but the dense punctuation of the head of 
N. puncticeps is wanting in NV. obtusus. 
ACRATUS. 
Acratus, Lacordaire, Gen. Col. vii. p. 463 (1866). 
This genus, formed at the expense of the older genera, Nemocephalus and Teramo- 
cerus, includes at present ten or twelve species, all from tropical America. 
1. Acratus chontalensis, sp. n. (Tab. III. figg. 138, 2; 14, ¢; 14a, hind 
tarsus, d .) 
Nigricans, supra rufo-brunneus vel brunneus, opacus ; capite et prothorace antice et postice transversim rugosis; 
elytris seriatim regulariter punetatis, versus suturam bistriatis. 
