70 LONGICORNIA. 
1. Stenygra histrio. 
Stenygra histrio, Serville, loc. cit. p. 97°. 
Hab. Mexico 1, Plan del Rio (Hége) ; Guaremata, San Gerénimo (Champion); Nica- 
raaua, Chontales (Belt). 
PLATYARTHRON. 
Platyarthron, Guérin, Icon. R. A. ii. p. 280 (1843). 
Celomarthron, Thomson, Class. Long. p. 199 (1860). 
Celarthron, Lacordaire, Gen. Col. ix. p. 142 (1869). 
Allied to Stenygra, and equally remarkable in form and coloration. Its range is 
similarly restricted to Tropical America, the species described by M. Thomson as 
Celomarthron chilense being with great probability a Central-American and not a 
Chilian insect. Four species are known. 
1. Platyarthron bilineatum. 
Platyarthron bilineatum, Guérin, Icon. R. A. iii. p. 280°. 
Hab. Mexico 1. 
2. Platyarthron rectilineum. 
Angustum, lineare, nigrum, politum, elytris utrinque linea fere ad apicem extensa subrecta lineolaque laterali 
sub humeros eburneis ; capite inter oculos unisulcato, occipite punctato-ruguloso ; thoracis lateribus opacis 
alutaceis, dorso polito transverse plicato, linea utrinque argenteo-sericea; elytris planis fere impunctatis ; 
antennis articulis 3°-6™ oblongo-ovatis, incrassatis, late sulcatis. 
Long. 9 lin. 
Hab. Guatemata, Zapote (Champion). 
Differs from P. bilineatum and the rest of its congeners by the single eburneous 
line of the elytra, which is nearly straight, curving only very slightly outwards, and 
extending from the base to within a short distance of the apex. The apical margin is 
obtusely rounded. The thorax is similar in form to that of P. bilineatum, but very 
different in sculpture, the flanks being opaque with excessively minute sculpture, and 
the dorsal surface for a considerable breadth polished and scored transversely, but not 
densely, with fine ruge. 
8. Platyarthron quadrinotatum. (Celarthron quadrinotum, Tab. VI. fig. 1.) 
Celarthron quadrinotatum, Bates, Trans. Ent. Soc. 1869, p. 385. 
Celomarthron chilense, Thomson, Class. Long. p. 200 (1860) ? 
Hab. Nicaragua, Chontales (Belt, Janson). 
The description above cited of Thomson’s Celomarthron chilense agrees so well with 
_ the Nicaragua insect that there can be little doubt it refers to the same species. The 
locality given is very probably erroneous. 
