PSEUDAMBATES.—PERIDINETUS. 171 
PSEUDAMBATES, nom. n. 
Pseudocholus, Desbrochers, Ann. Soc. Ent. Belg. 1. p. 866 (nota) (Nov. 1906) (nec Lacordaire, 1866). 
The type of this genus, Ps. biplagiatus, Desbr., from Costa Rica, is related to 
Ambates, mainly differing from it in the short-ovate, acuminate, antennal club, the 
wider scutellum, the more produced posterior angles of the second ventral segment, 
and the broad, rhomboidal, robust form of the body. The general coloration is very 
like that of Ambates cretifer, Pasc., and its allies. The mesothoracic epimera are 
greatly developed and ascending (a Barid-character separating Pseudambates from the 
Cholina), and the anterior coxe are almost contiguous. 
The generic name Pseudocholus is preoccupied in Rhynchophora, and must therefore 
be changed. 
1. Pseudambates biplagiatus. (Tab. IX. figg. 10, 10a, 2.) 
Pseudocholus biplagiatus, Desbr. Ann. Soc. Ent. Belg. 1. p. 366°. 
Subrhomboidal, broad, robust, shining, black; the prothorax with the flanks and under surface, the elytra 
each with a broad, oblique, curved fascia extending around the humeral callus from the base and a broad 
transverse fascia near the apex (almost reaching the suture), the metasternum, and the ventral surface 
in part (the outer portions of the second segment only in the ¢), densely clothed with white or pale 
ochreous scales, the legs with fine whitish hair-like scales, the rest of the surface almost bare. Head 
closely punctate, foveate between the eyes; rostrum stout, strongly arcuate, about as long as the 
head and prothorax, closely punctate, a little smoother in the 2; joints 1 and 2 of the funiculus equal 
in length. Prothorax rather convex, broader than long, conical, rapidly narrowed from near the base, 
the sides a little rounded behind; closely, finely punctate, with indications of a narrow smooth median 
line. LElytra broad, subtriangular, flattened on the disc anteriorly, the humeri obliquely truncated in 
front ; finely punctate-striate, the interstices closely, minutely punctate, flat, the alternate ones feebly 
costate at the apex. Ventral segments 1 and 2 broadly depressed down the middle in the ¢. 
Length 83-84, breadth 43 millim. (¢ 9.) 
Hab. Costa Rica, Reventazon (Biolley), San Carlos! (ex. coll. Schild-Burgdorf ). 
We have received two specimens of this species. 
Sect. PERIDINETIDES. 
Péridinétides, Lacordaire. 
Lacordaire included two Tropical-American genera in this section, one of which 
(Peridinetus) is well represented within our limits, the other (Megops, Schénh.) 
inhabiting Brazil. 
PERIDINETUS. 
Peridinetus, Schonherr, Gen. Cure. iv. p. 467 (1837), viii. 2, p. 56 (1844) ; Lacordaire, Gen. Col. 
vii. p. 210; Chevrolat, Ann. Soc. Ent. Belg. xxvi. p. 79 (1883) (part.); Jekel, Ann. Soc. Ent. 
Belg. xxvi. p. 84. . 
This genus, which is well represented within our limits, is closely related to Ambates, 
mainly differing from it in the sulcate prosternum, the non-contiguous anterior coxe, 
and the less rapidly descending scrobes. The antenne in the Central-American forms 
ZZ 2 
