ONCORRHINUS. 67 
rostrum. The eyes in the typical genera (Anchonus, &c.) are depressed and finely 
facetted, and placed low down on the globular portion of the head, whereas in 
INoptrophorus, Ithaura, and Theognete they are more or less coarsely facetted and 
placed at the sides of the rostrum behind. ‘The funiculus of the antenne is 8-jointed 
in Anchonus, Rhyparonotus, Cestophorus, and Leprosomus (the two last-mentioned genera 
have not yet been detected in Central America), 7-jointed in Oncorrhinus, Dioptro- 
phorus, &c., and 6-jointed in Geobyrsa (Anephilus). All are apterous, except 
Oncorrhinus, which has a scutellum and fully-developed wings. The apterous species, 
as might be expected, are extremely local, and each confined to a limited district, the 
winged forms, on the other hand, being somewhat widely distributed. 
These insects are chiefly found under the bark of decaying trees, or by beating dead 
branches, and some of them are often thicklycoated with an earthy incrustation, which 
hides most of the surface-sculpture. I have found it impossible in many cases to identify 
specimens till they were cleaned by immersion in caustic potash, which removes the dirt 
without loosening the scales. In Anchonus and its allies the scales on the upper surface 
of the body are more or less setiform, and sometimes clubbed at the tip ; they vary in 
length according to the species, and are often arranged in fascicles on the prothorax 
and on the more elevated portions of the elytra. Zyphloglymma, Dury, including a 
blind form from Ohio, belongs to this group, near Jthaura. | 
Sect. I. Eyes placed low down on the globular portion of the head. 
ONCORRHINUS. 
Oncorrhinus, Schonherr, Gen. Cure. iii. p. 598 (1836); Lacordaire, Gen. Col. vi. p. 361; Faust, 
Deutsche ent. Zeit. 1892, p. 21. | 
A genus including a few Tropical-American forms, two occurring within our limits 
Tt differs from the other genera of the group in having a scutellum and fully-developed 
wings. ‘The eyes are large, but not prominent, and nearly contiguous beneath, and 
they are more coarsely facetted than in Anchonus and its allies. 
1. Oncorrhinus scabricollis. (Tab. V. fig. 4, 3.) 
Oncorhinus scabricollis, Gyll. in Schénh. Gen. Cure. iii. p. 594". 
Onchorhinus scabricollis, Fahr. op. cit. vii. 2, p. 338°. 
Onchorhinus quadricollis, Chevr. in litt.* 
Hab. Mexico, Sierra de Durango (Flohr), Toxpam, Tehuantepec (Sallé), Jalapa 
(Hoge); British Honpuras, R. Sarstoon, Belize (Blancaneaux) ; Guatemaia, Chacoj in 
Vera Paz, El Reposo, Zapote (Champion); Nicaragua, Chontales (Janson); Panama, 
Bugaba, Volcan de Chiriqui (Champion).—CoLomB1a? ; Ecuabor ; Gurana, Cayenne !2°, 
A common insect in Central America, and generally known in collections under the 
name of O. scabricollis, but I am not quite sure that this identification is correct. In 
KK 2 
