PSEUDOCYPHUS.—COMPSUS. 287 
(Z/6ge), Santa Lucrecia (nab, in U.S. Nat. Mus.) ; Guatemana, Livingston and Trece 
Aguas (Schwarz and Barber, in U.S. Nat. Mus.), Yzabal (Sallé), Chiacam, San Juan, 
Sabo, Teleman, Panzos (Champion, Conradt), Coban (Conradt). 
This insect has long been known in collections under one or the other of the above- 
quoted MSS. names. It is extremely variable, as regards the colour of the scales and 
the development of the markings, which are very rarely altogether obsolete. ‘The 
typical form is from the Mexican State of Vera Cruz, the var. « from Livingston and 
Yzabal, the var. 8 from various places in Alta Vera Paz (especially from the warmer 
part of the Polochic valley), all the localities being on the Atlantic slope. P. chrysopus 
is represented in Yucatan by P. zebra, which has still more widely separated seriate 
punctures on the elytra and the dark post-median fascia curved or oblique. 
COMPSUS. 
Compsus, Schénherr, Cure. Disp. Meth. p. 109 (1826); Gen. Cure. i. p. 640; Lacordaire, Gen. 
Col. vi. p. 116; Horn, Proc. Am. Phil. Soc. xv. p. 88. 
? Oxyderces, Schénherr, Gen. Curc. i. p. 646. 
This genus, like Cyphus, extends northward to the United States. It includes a 
large number of South American forms, most of which are so densely clothed with 
chalky-white or green scales that the sculpture cannot be properly seen. ‘The essential 
characters of the species here referred to Compsus (the type of which is Cyphus 
acrolithus, Germ.) are :— 
Rostrum broad, widened anteriorly, emarginate at the sides and apex, the upper portion obliquely bifurcate 
anteriorly, the nasal plate wide, triangular, bare, the scrobes visible from above, subangulate, not 
reaching to beneath the eyes ; eyes not strictly lateral, more or less rounded (obliquely truncate in front 
in C. argyreus, L.); antennal scape flattened, narrow, feebly clavate ; scutellum well developed ; elytra 
regularly 10-striate, the outer stria coalescent from the basal third, the humeri prominent; anterior 
tibia unguiculate, not denticulate within; posterior tibia narrowly laminate at the apex, the space 
between the marginal cilia bare, the articular surface large, feebly ascending or subterminal, squamose ; 
body winged, densely squamose. 
The scales in some of the species vary in colour from green to white (C. auri- 
cephalus, &c.), and several of the southern forms are ornamented with small blue 
evanescent spots, this colour sometimes extending to the legs also. ‘Ihe elytra in the 
females are often more distinctly divergent or mucronate at the tip than in the males. 
C. carinirostris, Boh., has two additional abbreviated striz on the elytra, the articular 
surface of the hind tibie glabrous, &c., and it is here placed under Lvophthalmus 
(antea, p. 254). 
a. Rostrum carinate anteriorly ; elytra each with a bare black spot on the 
middle of the disc, the seriate punctures scattered, the alternate inter- 
stices scarcely more raised than the others, and the striz normal ; legs 
partly blue: general vestiture white . . . . . . . . + « . ceruleipes, sp. n. 
