584 SEEEICOENIA. 



PTOKTHOCERA. 



Antenna? ( <$ ) elongate, with the basal joint stout and rather short, 2 very small, transverse, joints 3-10 each 

 with a moderately long, oblique ramus arising from the base, the rami gradually increasing in length, 11 

 about as long as the ramus on the preceding joint; eyes large, moderately prominent ; gular appendages 

 well developed ; prothorax transverse, trapezoidal, the apex deeply sinuate on either side opposite the 

 eyes, the anterior angles produced in front, the hind angles also prominent ; elytra with ten rows of 

 punctures, separated by convex, rather broad interspaces ; legs moderately elongate, rather slender ; tarsi 

 simple, with a short onychium, the basal joint about as long as the following three joints united, the 

 latter gradually decreasing in length ; body glabrous in the d ; the other characters as in Callirrhipis. 



The single species from which the above characters are taken differs from Callir- 

 rhipis in having the ramus on the third and following antennal joints arising from the 

 base (instead of from the apex) in the male, the basal joint also being shorter ; the 

 thorax is less compressed at the sides anteriorly, with prominent, less declivous anterior 

 angles ; the elytra have the interspaces between the rows of punctures rather broadly 

 raised ; and the body is glabrous in the male. The antennal rami are of about the 

 same length as those of the same sex of Callirrhipis venosa. From Zenoa, Say, a genus 

 containing a single species from North America, in which the antennae are described as 

 subpectinate in the male and serrate in the female, it may be separated by the form 

 of the antennae, the sculpture of the elytra, the short onychium, &c. Males only have 

 been found. 



1. Ptorthocera calva. (Tab. XXIV. figg. 27, <j; 27 a, antenna; 27 b, geni- 

 talia.) 



c? . Elongate, narrow, somewhat cylindrical, shining, black or castaneous, the antennae brownish, with the 

 basal joint darker, the legs nigro-piceous or rufo-castaneous and slightly pubescent. Head longitudinally 

 grooved and excavate in the middle in front, canaliculate on the vertex, sparsely, somewhat finely punctate. 

 Prothorax sparsely, rather finely punctate, canaliculate, and depressed in the middle and on either side at 

 the base ; in one specimen strongly, transversely plicate on either side before the base, and with the margins 

 deeply excised. Scutellum almost smooth. Elytra elongate, considerably wider than the prothorax, sub- 

 parallel to the middle, and conjointly rounded at the apes ; coarsely seriate-punctate, the interspaces smooth 

 and convex throughout, becoming partly confluent towards the apex. Beneath sparsely punctured. 



Length 9jg-10£, breadth 3-3f miUim. 



Hab. Guatemala, Cerro Zunil {Champion) ; Nicakagua, Chon tales (Belt). 



One male from each locality. The Guatemalan specimen differs from the other in 

 having the thorax strongly transversely plicate on either side before the base, and the 

 antennal rami less elongate. There can be little doubt, however, that the two insects 

 belong to the same species. The Nicaraguan specimen is figured. 



SAND ALUS. 



Sandalus, Knoch, Neue Beytr. p. 131 (1801) ; Lacordaire, Gen. Col. iv. p. 253 ; Horn, Trans. Am. 

 Ent. Soc. ix. p. 86. 



A genus containing fifteen described species — four from the United States of North 



