ACRATUS. ; 77 
Mas. Rostro perelongato, subtus hirsuto; prothorace lateribus undulatis, undique transversim rugosis ; elytris 
apice longius bidentatis. 
Long. 43 millim. 
Fem. Rostro polito, cylindrico ; prothorace fere simplici ; elytris apice brevissime bidentato. 
Long. 30 millim. 
Hab. Nicaracua, Chontales (Janson). 
The male of this species is a very remarkable insect, having an irregular outline of 
the sides of the thorax, and the flanks covered with transverse wrinkles. ‘The head is 
very slender, its sculpture recalls that of the genus Rhyticephalus; besides the trans- 
verse wrinkles, it bears small granular tubercles. The rostrum of the male is very 
elongate, dull, quadrangular, flat above and at the sides, and without sculpture; the 
lower face is densely punctate and set with short seta, strongly carinate along the 
middle. The under surface of the head is wrinkled in the male, and obsoletely so in 
the female ; it is finely canaliculate from the base to near the back of the eyes, where 
there is a very narrow fovea; in the female the metarostrum is biseriately punctate 
and setigerous. The line of suture between the two elongate abdominal segments is 
distinct in both sexes; the abdomen is not sulcate. The elytra are of a dull brown or 
red-brown colour, with, in certain lights, a green or metallic tinge, the suture is blackish ; 
the series of punctures are very regular and not small, though only obsoletely impressed ; 
the two strie along each side of the suture are deep and narrow, and extend quite to 
the base; the narrow interval between them, at the apex, becomes an ordinary inter- 
stice. The legs are between black and red in colour, the outer surface corresponding 
more than the other surface with the colour of the under part of the body. 
Two specimens. 
2. Acratus apicalis, sp. n. 
Gracillimus, niger, supra opacus, levigatus; elytris versus suturam bistriatis, stria externa anterius abbre- 
viata; apicibus muticis. 
Long. 19-39 millim. 
Hab. Nicaraaua (Sallé), Chontales (Belt, Janson). 
This elegant insect is distinguished by the impunctate surface and unspined apices 
of the elytra. The male is excessively variable in size; the head and rostrum are 
nearly as elongate as the rest of the body, impunctate, the rostrum quadrangular, 
without hair beneath, the median fovea rather small; the upper surface of the head 
with some indistinct transverse wrinkles. The thorax is slender and very long, quite 
-impunctate, with one or two obsolete transverse wrinkles in front. Elytra very slender, 
the apices unarmed, but the apical part prolonged, and forming a strong contrast in 
sculpture to the anterior portion, being coarsely transversely rugose between the carinex. 
The lower surface is more shining than the upper, but is not sulcate. ‘The tarsi are 
only of moderate length. 
The wrinkles on the head and thorax become obsolete i in the small males, which also 
