356 + RHYNCHOPHORA. 
The three closely-allied species referred to this genus are nearly related to Limno- 
baris calandriformis and other ‘Tropical-American forms with widely-separated anterior 
coxee and bispinose prosternum in the male, from which they differ in having the 
pygidium completely exposed in both sexes, and apparently bisegmentate in the male. 
Limnobaroides, therefore, is one of those genera with the prosternal structure of the 
typical “ Centrinides” and the exposed pygidium of the “ Baridiices vrais.” L. exposita 
appears to be a common insect in the “ tierra caliente” of Central America. 
1. Limnobaroides exposita, sp.n. (Tab. XVIII. figg. 9, 9a, 6, ¢; 10, 2.) 
Ovate, flattened above, shining, black, the base of the antenna, apical half of the rostrum, and the legs often 
more or less ferruginous ; sparsely clothed with small, setiform, flavo-cinereous or cinerous scales (which 
are usually condensed along the sides of the prothorax and wanting on the disc), the vestiture of the 
elytra sometimes blackish, except at the base and along the suture, that of the under surface entirely 
cinereous. Head closely punctate; rostrum moderately stout, as long as the head and prothorax, 
arcuate, closely punctate, in the 9 with the apical half much smoother and more slender, the 
antenne inserted at (¢) or a little behind (Q) the middle. Prothorax broader than long, rounded 
at the sides anteriorly, narrowed and feebly constricted in front, closely, coarsely punctate, except 
long the smooth median line. Scutellum transverse, Hlytra rounded-triangular, rather short, depressed 
along the suture; deeply striate, the striw feebly punctate, the interstices flat and rather coarsely 
uniseriate-punctate. Pygidium densely punctate. Prosternum in fully-developed examples armed with 
two slender spines, and with a deep fovea in front of them, in the , flattened in the ©. Anterior 
coxe separated by rather more than their own width. Ventral segments 1 and 2% flattencd down the 
middle, and 5 truncate at the apex, in the ¢. 
Length 23-31, breadth 1-13 millim. (¢ @.) 
Hab. Mexico, Motzorongo in Vera Cruz (Osborn, in U.S. Nat. Mus.), Temax in 
N. Yucatan (Gaumer); Britisu Honpturas (Blancaneaux); Gvatemata, Panzos 
(Champion, Conradt); Sauvapor, Sonsonate and Izalco (Knab, in U.S. Nat. Mus.) ; 
Nicaragua, Managua (Solari); Cosra Rica, San Carlos, Puerto Limon (U.S. Nat. 
Mus.); Panama, Tabernilla, Canal Zone (Buseck, in U.S, Nat. Mus.). 
Numerous examples, varying in the colour of the legs and rostrum, and in the 
greater or less predominance of the cinereous setiform scales on the elytra, these 
being sometimes wholly of that colour. ‘The prothorax is more cuarsely punctate 
than in the allied forms. In two of the males (one with the penis extruded) the 
prosternal spines are entirely obsolete. 
2. Limnobaroides plana, sp. n. 
Oblong-elliptic, flattened above, shining, black; sparsely clothed with setiform cinereous scales, which on the 
elytral interstices are intermixed with minute darker scales. Head transversely depressed between 
the eyes, minutely punctate; rostrum strongly arcuate, long and slender, thickened and closely punctate 
at the base, for the rest very finely punctate, the antenne inserted at about the basal third. Prothorax 
broader than long, rounded at the sides anteriorly, narrowed and constricted in front; sparsely punctate 
except along a narrow median space, the punctuation becoming coarser and closer towards the sides, 
Seutellum transverse. Elytra deeply punctate-striate, the interstices flat and uniseriate-punctate 
Pygidium sloping, densely, rugosely punctate. Beneath closely punctate. Prosternum unimpressed, 
foveolate between the anterior coxe, which are separated by a little more than their own width. : 
Length 33, breadth 13 millim. (Q.) 
Hab, Panama, Volcan de Chiriqui 3000 feet (Champion). 
