ARRHENOPLITA. 175 
ARRHENOPLITA. 
Oplocephala, Laporte & Brullé, Ann. Sciences Nat. xxiii. p. 338 ; Mulsant, Col. de France, Latigénes, 
p- 215; Lacord. Gen. Col. v. p. 302 (nomen preoc.). 
Hoplocephala, Horn, Rev. Ten. of Am. north of Mexico, p. 879; Gemm. & Harold, Cat. vii. p. 1949. 
Arrhenoplita, Kirby, Faun. Am. Boreal. p. 235. 
Evoplus, Leconte, New Sp. Col. p. 128. 
Numerous species of this genus have been described from the temperate and tropical 
regions of both hemispheres, the Antilles, Tahiti, &c.; two inhabit Europe, and several 
are found in the United States; none have hitherto been recorded from our country. 
Evoplus, Leconte, is connected by numerous intermediate forms, and cannot be main- 
tained as distinct from Arrhenoplita. One only of our species (A. dicornis) has the 
upper surface of a metallic greenish colour; the head in the male is usually armed 
with two erect tubercles or horns, in one or two species, however, these are almost 
obsolete; a few small forms have the elytra confusedly punctured, and without the 
usual rows of coarser impressions. 
The genus is well represented in Central America by thirteen species; the name 
Hoplocephala being preoccupied in Reptilia, I adopt Arrhenoplita of Kirby. The 
different species are found in fungi and beneath bark, often in great profusion. 
* Elytra with regular rows of punctures. 
1. Arrhenoplita bicornis. 
Hispa bicornis, Fabr. Gen. Ins. Mant. p. 215 (1777) *; Mant. Ins. i. p. 47. 
Diaperis bicornis, Oliv. Ent. iii. 55, p. 6. t. 1. figg. 4a, 5°. 
? Blaps metallica, Palisot de Beauv. Ins. Afr. et Am. p. 139, t. 306. f. 2°. 
Arrhenoplita bicornis, Kirby, Faun. Bor. Am. iv. p. 235 *. 
Oplocephala virescens, Lap. & Brullé, Ann. Sciences Nat. xxiii. p. 341°. 
Hoplocephala bicornis, Horn, Rev. Ten. of Am. north of Mexico, p. 380°. 
Oplocephala gracilis, Motsch. Bull. Moscou, xlvi. part 1, p. 467’. , 
Hab. Norra America!?, United States?45¢7,—Mexico, Tuxtla, Cordova (Salié), 
Jalapa, Esperanza (Hoge); Britisa Honpuras, Belize (coll. F. Bates, Blancaneaux), R. 
Hondo (Blancaneaux); GuatemaLa, Zapote (Champion) 
Central-American examples are greenish-neous in colour, rarely tinged with blue in 
some few individuals from Mexico; they are much larger (4-5 millim.) than those from 
the United States (34-4 millim.), and the males have stouter horns; other differences 
of importance I fail to find. This species is abundant in the United States, and 
equally so in the northern part of our country ; it does not extend south of Guatemala. 
Poorly-developed males have the usual cephalic horns represented by two stout conical 
tubercles only. 
