STATES OF INSECTS. 329 



teral horns is towards the anus, and the base of the in- 

 termediate one covers the scutellum a . Others have four 

 of these singular arms : this is the case with one of our 

 rarest beetles, Bolbocerus mobilicornis K., which has four 

 dentiform horns, the intermediate pair being the short- 

 est, arranged in a transverse line on the anterior part of 

 the thorax b . In B. quadridens these are merely teeth. 

 In Phanceus Faunus c 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 d ; and Copris Anterior Fabricius and 

 Olivier describe as having a many-toothed thorax ; and 

 from the figure of the latter e , 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 Spicidator Humb.), the breast 

 of 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 Rynchccnus Strix F. f 

 In the individual which I take to be C. Spiculator, the 

 pectoral horns are very long, curving upwards at the 



a Oliv. no. 3. t. xxiv./. 208, b Ibid. t. x ./. 88. 



e Ibid./ 87- d Ibid. t. xx.f. 185. 



e Ibid. t. vi.f. 42. a. ' Ibid. n. 83. Curciilio t.xx'ii.f. 295. 



