308 RHYNCHOPHORA. 
having the general facies of a Centrinid, with the fully-exposed pygidium of the 
‘¢ Baridiides vrais.” 
1. Pseudorthoris devexus, sp.n. (Tab. XVIIL. figg. 12, 12 a, 6, 2.) 
Narrow, somewhat flattened above, black or piceous, the antenne obscure ferruginous ; clothed with very 
small, narrow, white and brownish scales, the white scales condensed into a faint median line and a small 
spot at each hind angle of the prothorax and a spot on the scutellum, the elytra also with larger white 
scales intermixed with the others, which are arranged in one or two lines along each interstice ; the entire 
under surface closely albo-squamose. Head very finely punctate, faintly foveate between the eyes; 
rostrum arcuate, thickened towards the base, closely punctate, not longer than the head and prothorax in 
the 3, the apical portion longer and smoother in the 9, the antenne inserted considerably behind the 
middle in the ¢ and at the basal third in the 9. Prothorax transverse, densely, finely punctate. 
Elytra gradually narrowing from the base, narrowly striate, the interstices much wider than the striz 
and closely, rugulosely punctate. Beneath densely punctate. Prosternal groove almost hidden by the 
vestiture. Legs rather slender. 
Length 23-23, breadth 1-11 millim. (¢ 2.) 
Hab, Mexico, Toxpam in Vera Cruz (Sallé), Teapa (H. H. Smith). 
Four males and three females. 
ORTHOMERINUS, gen. nov. 
Rostrum curved, as long as the elytra, abruptly separated from the head, the scrobes becoming confluent at 
some distance from the base beneath; mandibles short, decussate, notched within; head small; antennal 
club ovate, the scape not nearly reaching the eyes; prothorax conical, deeply sinuate at the base, 
tubulate in front; scutellum small, transverse, free; elytra triangular, with the obliquely truncated 
humeri almost in a line with the sides of the prothorax; pygidium not visible; prosternum unarmed, 
the anterior portion long, flattened, and declivous, the posterior portion developed into a large, transverse, 
flattened protuberance, which is abruptly declivous in front, and sharply bifurcate and completely 
covering the mesosternum behind; anterior coxe separated by fully their own width; femora linear, 
unarmed ; tarsal claws subconnate at the base; body rhomboidal, flattened above, coarsely sculptured, 
clothed with fine scattered vestiture. 
Type, O. pittiert. 
This genus may be known by the extraordinary development of the posterior portion 
of the prosternum, the small head, linear, unarmed femora, &c. Orthomerinus affords 
a sort of connecting-link with the ‘‘ Madarides,” the prosternal process being greatly 
developed and covering the mesosternum behind; the pygidium, however, is not 
visible. 
1. Orthomerinus* pittieri, sp.n. (ab. XVIII. figg. 13, 13a, 3 .) 
Shining, black, with a faint brassy lustre ; sparsely clothed with minute hair-like scales, those on the under 
surface and legs whitish, the others darker and inconspicuous. Head closely punctate, trausversely 
grooved between the eyes; rostrum rather stout and compressed, abruptly excavate on each side at the 
base beneath, tapering towards the tip, coarsely punctate, the antenne inserted behind the middle. 
Prothorax slightly broader than long, conical, constricted in front, the sides a little rounded towards the 
base ; coarsely, closely punctate, the interspaces at the sides obliquely rugose. Elytra narrowly, deeply 
striate, the interspaces broad, transversely rugose, the outer ones feebly convex. Beneath coarsely, closely 
* Since Plate XVIII. was printed, the name Orthomerus has been found to be preoccupied in Reptilia, 
hence the change. 
