280 SEEKICORNIA. 



attenuate behind. Upwards of eighty specimens of C. exquisitus are before me, only 

 three of which are males ; it varies in length from 25-40 millim., and in breadth from 

 9-16 millim. In one specimen from Bugaba the elytra have a line of elongate white 

 scales near the margin in front. C. exquisitus is an abundant insect in the forest-region 

 of Chiriqui. 



A male from the Volcan de Chiriqui is figured. 



10. Chalcolepidius virens. 



Chalcolepidius porcatus (Linn.), Cand. Monogr. Elat. i. p. 270 1 • Revis. Elat. p. 163 (part.) 2 . 

 Elater virens, Fabr. Mant. Ins. i. p. 172 3 ; Oliv. Ent. ii. no. 31, p. 15, t. 2. fig. 19, t. 5. fig. 55 4 . 

 Chalcolepidius virens, Cand. Elat. Nouv. iii. p. 22 5 ; Bull. Soc. Ent. Belg. 1886, p. lxxiii 6 . 



Hal. Mexico 2 {coll. Janson) ; Panama, Chiriqui {Bible). — South America l 2 3 6 to 

 Brazil. 



Candeze in his " Monograph " treats this insect as a variety of the variable G. porcatus, 

 Linn. ; but he subsequently separated it as distinct, chiefly on account of the unicolorous 

 minute scales of the elytra. In C. porcatus and the closely allied C. aurulentus, Cand., 

 the elytral striae have each a line of whitish elongate scales, the interstices with minute 

 metallic scales. I have seen three (?) specimens only of C. virens from within our 

 limits. 



11. Chalcolepidius silbermanni. (Tab. XL fig. 25, $ .) 



\J Chalcolepidius silbermanni, Chevr. Col. Mex. Cent. ii. fasc. 8, no. 197 (Sept. 1835) * ; Cand. 

 Monogr. Elat. i. p. 275 2 j Revis. Elat. p. 165 3 ; Bull. Soc. Ent. Belg. 1886, p. lxxii \ 

 Chalcolepidius sericeus, Er. Zeitschr. fur Ent. iii. p. 83 (1841) 5 . 

 Chalcolepidius sulciger, Dej. Cat. 3rd edit. p. 100 e . 



Hal. Mexico 2 3 4 6 , Ciudad in Durango {Forrer), Ventanas in Durango, Jalapa, 

 Oaxaca {Edge), Amula, Omilteme, and Xautipa in Guerrero {H. H. Smith), Sante- 

 comapan, Vera Cruz l , Juquila, Tehuantepec, Chiapas {Salle), Cordova {Salle, Hoge), 

 Temax in North Yucatan {Hoge), Tuspan * ; Bkitish Honduras {Blancaneaux) ; 

 Guatemala, Panzos, Chacoj, San Juan, Panima, and San Geronimo in Vera Paz, El 

 Reposo, Pantaleon, Torola {Champion) ; Nicaragua, Chontales {Belt, E. M. Janson, 

 Bichardson); Costa Rica {Salle); Panama, Volcan de Chiriqui, David {Champion), 

 Panama city {J. J. Walker), Taboga I. {Champion, J. J. Walker), Obispo {Salvin). — 

 Colombia 3 4 ; Venezuela 4 , La Guayra 5 . 



This is the commonest species of the genus in Central America, extending north- 

 wards to Durango ; it reaches an altitude of 8000 feet in some parts of Mexico. In 

 Guatemala the insect inhabits both the Atlantic and Pacific slopes, from the low hot 

 country to an elevation of 3000 feet. C. silbermanni varies greatly in size — from 



