328 STATES OF INSECTS. (Jmago.) 
ones short?. In D.? Geryon the point of the lateral 
horns is towards the anus, and the base of the interme- 
diate one covers the scutellum>. Others have four of 
these singular arms: this is the case with one of our 
rarest beetles, Bolbocerus mobilicornis, which has four 
dentiform horns, the intermediate pair being the short- 
est, arranged in a transverse line on the anterior part of 
the thorax*. In B. quadridens these are merely teeth. 
In Phaneus Faunus* it has two lateral, elongated, com- 
pressed, truncate, horizontal horns, and two intermediate 
teeth. Dynastes Milon has a still greater number of 
horns on the thorax of the male, there being two lateral 
anterior ones and three posterior ones—the intermediate 
being the longest®; and Copris Antenor Fabricius and 
Olivier describe as having a many-toothed thorax; and 
from the figure of the latter ‘, the male appears to have 
seven prominences. 
But the males of insects are not only occasionally di- 
stinguished by these dorsal arms—in a few instances they 
are also furnished with pectoral ones. ‘The illustrious 
traveller Humboldt found in South America a species 
of weevil (Cryptorhynchus Spiculator), the breast o. 
which was armed with a pair of long projecting horns ; 
and I possess both sexes of four species, three at least 
from Brazil, that exhibit in one individual the same cha- 
racter. One, concerning the country of which I am un- 
certain, recedes somewhat from the type of form of the 
rest, and comes very near that of Rynchenus Strix®. In 
the individual which I take to be C. Spzculator, the pec- 
* Schon. Synon. i. t. 1. » Oliv. no. 3. t, xxiv. f. 208. 
© Ibid. ¢. x. fi 88. “ Ibid. f. 87. 
© Ibid. ¢. xx. f. 185. Ibid. ¢. vi. f. 42. a. 
® [bid. n. 83. Curculio t. xxii. f. 295. Schonherr (Synon, Ins. &c. 
ty. 308.) makes a genus of these weevils, which he names Cenfrinus. 
