PSEUDORHIANUS. 245 
« 
This genus is based upon a Mexican insect with a peculiar sexual distinction in ‘the 
male. The Costa Rican 2. compressirostris has the rostrum strongly compressed and 
abruptly separated from the head, and the anterior coxe much more approximate, but 
it can be included here for the present. Centrinus conformis and C. ruficornis, Boh., 
and other S.-American forms may have to be included under Pseudorhianus. 
1. Pseudorhianus impressus, sp. n. (Rhianus impressus, Tab. XIII. figg. 33, 
33a, 3.) 
Centrinus (Baris) impressus, Sturm, in coll. Sallé (nec Kirsch). 
$. Oblong-rhomboidal, shining black, glabrous above, the punctures of the under surface each bearing a 
whitish hair. Head closely, finely punctate; rostrum strongly arcuate, long, stout, flattened towards 
the tip, thickly, rather coarsely punctate, subcarinate at the base, the antenne inserted far behind the 
middle, joint 2 of the funiculus nearly as long as 1, the club ovate. Prothorax arcuately narrowing 
from the base, strongly constricted in front; finely, somewhat closely punctate, a narrow smooth space 
down the middle excepted. Scutellum small, transverse. Elytra rather long, subtriangular, with the 
humeri swollen and somewhat projecting ; deeply striate throughout, the strie feebly punctate, the 
interstices very sparsely, minutely punctate, almost flat, subcostate at the apex, the disc transversely 
depressed below the base, near the middle, and at about one-third from the apex. Beneath sparsely, 
finely punctate; prosternum with a broad, shallow, sharply margined sulcus, the smooth, flat intercoxal 
portion furnished with a dense pencil of long erect ochreous hairs in the centre ; anterior coxe separated 
by more than their own width. Femora subclavate, unarmed. Tibi all more or less hollowed and 
ciliate in their apical half within. Tarsi rather slender. 
Q. Rostrum longer, cylindrical, almost smooth, except at the base; prothorax subconical, more closely 
punctate ; anterior coxe more approximate ; tibie slightly sinuate on their inner edge. 
Length 5-6, breadth 23-3} millim. (¢ 2.) 
Hab. Mexico (Sailé, ex coll. Sturm, and Trugqui in coll. Fry: 3), Panistlahuaca in 
Oaxaca (Sallé: 2). 
Two males and one female. The pencil of long hairs on the prosternum between 
the anterior coxe is a remarkable male-character in this species. 
9. Pseudorhianus compressirostris, sp.n. (Tab. XIV. figg. 1, 1a.) 
Oblong-subrhomboidal, robust, shining, fusco-castaneous, the head, rostrum, prothorax, femora, and tibie 
nigro-piceous ; the prothoracic punctures and those along the elytral interstices each bearing a semierect, 
pallid seta, the under surface and legs sparsely clothed with long pallid bristly hairs. Head finely 
punctate, with a deep transverse sulcus between the eyes; rostrum strongly arcuate, a little longer than 
the head and prothorax, the basal half gibbous, compressed, and broadly sulcate on each side, the sides 
angulate at the base beneath, sparsely, finely punctate, the antenns inserted at a little behind the middle, 
joint 1 of the funiculus elongate, 2 much longer than 3, the club ovate. Prothorax broader than long, 
subconical, strongly constricted in front; with coarse scattered punctures, a space along the middle 
impunctate. Scutellum transverse, trapezoidal. Elytra much wider than the prothorax, narrowing 
from the base, the disc transversely depressed at the base and beyond the middle ; punctato-sulcate, the 
interstices convex and each with a widely-scattered series of coarse scattered setigerous punctures. 
Beneath sparsely punctate. Prosternum broadly and shallowly sulcate anteriorly and with a smooth 
transverse cavity in the apical constriction. Mesosternum depressed. Anterior coxe narrowly 
separated. 
Length 53, breadth 24 millim. (2?) 
/ P DR CHO 
