244 _ RHYNCHOPHORA. 
1, Rhianinus niveiscutum, sp. n. (Rhianus niveiscutum, Tab. XIII. figg. 32, 
32 a.) 
Oblong-subrhomboidal, shining, black, the antennz and the tip of the rostrum ferruginous in one specimen ; 
the scutellum densely albo-squamose, the rest of the upper surface bare, the entire under surface thickly 
set with small, narrow, hair-like, white scales. Head closely punctate; eyes separated by about one- 
half the width of the rostrum ; rostrum strongly arcuate, not longer than the head and prothorax, very 
stout and gibbous at the base, flattened at the apex, the basal half tricarinate and closely punctate, the 
apical portion flattened and very sparsely punctured; antenns with joints 2-7 of the funiculus short, 
the club ovate, small. Prothorax gradually narrowing to the short, tubulate anterior lobe; very . 
sparsely, finely punctate. Scutellum large, transversely subquadrate. Elytra triangular, long, slightly 
depressed along the suture, the humeri swollen; sharply striate throughout, the strie feebly punctate, 
the interstices flat and almost smooth. Beneath closely punctate. Prosternal sulcus narrow, continued 
between the narrowly-separated anterior coxe. 
Length 53-54, breadth 34-34 millim. (9?) 
Hab. Guatemata, Senahu in Vera Paz (Champion). 
Two specimens. Narrower than Rhianus mexicanus, the scutellum densely squamose, 
the elytra sharply striate throughout, the under surface closely punctate and finely 
squamose, the antennal club small, the eyes separated by about one-half the width of 
the rostrum, the rostrum itself more flattened at the tip and tricarinate in its basal 
half, 
2. Rhianinus carinirostris, sp. n. 
Subrhomboidal, rather narrow, shining, black ; the scutellum albo-squamose, the under surface and legs clothed 
with small, narrow, white scales. Head closely punctate, feebly sulcate between the large, narrowly 
separated eyes; rostrum stout, flattened at the apex, about as long as the head and prothorax, closely 
punctate, a smooth space along the middle of the apical half excepted, sharply carinate on each side to 
the tip. Prothorax transverse, subconical, strongly constricted in front; very sparsely, minutely 
punctate. Scutellum small, transversely subquadrate. Elytra subtriangular, narrowing from the base, 
strongly depressed along the whole length of the suture, the humeri not prominent ; sharply and deeply 
striate, the strie faintly punctate, the interstices smooth and flat. Beneath closely punctate. 
Length 3, breadth 12 millim. 
Hab. Panama, Volcan de Chiriqui 3000 feet (Champion). 
One specimen. Very much smaller than the Guatemalan RB. niveiscutum, the eyes 
subcontiguous, the rostrum carinate on each side to the tip, the elytra shorter, with 
the suture more depressed and the humeri less prominent. 
PSEUDORHIANUS, gen. nov. 
Rostrum arcuate, stout; mandibles feebly notched on their inner edge, short, slightly decussate when closed : 
antennal club ovate ; eyes separated above by the width of the rostrum ; prothorax tubulate in front : 
scutellum small, transverse, free; elytra triangular, much wider than the prothorax, deeply stxignd 
pygidium not visible; prosternum unarmed, broadly and shallowly sulcate, the sulcus limited on each 
side anteriorly by a distinct ridge; ventral segments 1 and 2 connate at the middle; femora subclavate 
unarmed, the anterior and intermediate pairs dilated at the outer apical angle; tarsal claws long free’ 
body rhomboidal, polished, almost glabrous above. , ’ 
Type, Ps. impressus. 
