ENEMA.— STKATEG-US. 



329 



All gradations in the size of the tubercle on the hinder side of the horn of the male 

 are found when a large series is examined. Its absence is simply a sign of lower 

 sexual development. I do not remember to have seen the var. lupercus in the Amazons 

 region, where E. pan is rather common, and where it is twice the size of the largest 

 Mexican and Paraguayan examples that I have seen. Females of both forms do not 

 differ, except in their very much smaller size, from the same sex of E. infundibulum, 

 with which E. pan in the equatorial zone of America is always associated. These 

 curious facts of distribution and development of male horns according to latitude make 

 it extremely probable that E. infundibulum as well as E. pan and E. lupercus are only 

 varying forms of development of one and the same species, the development being of 

 size in both sexes, and of length and form of cephalic and thoracic horns in the male. 



A male example from Cordova of the var. lupercus is shown on our Plate. 



3. Enema endymion. (Tab. XIX. figg. 13, 13 a, 6 .) 



Enema Endymion, Chevr. in Guer. Mag. Zool. 1843, Col. Mex. p. 29 l . 

 Enema Lupercus, Burm. Handb. der Ent. v. p. 236 (nee Chevrolat) 2 . 



Hob. Mexico 12 , Tuxtepec (Salle), Jalapa (Edge), Oaxaca (Fenochio); British 

 Honduras (Blancaneaux) ; Guatemala, Panzos (Champion); Nicaragua, Chontales 

 (Belt, Janson) ; Costa Rica, Cache (Rogers) ; Panama, Volcan de Chiriqui (Champion). 



A very distinct species, widely distributed, but apparently not common. It was 

 well described by Chevrolat in both sexes, but subsequently mistaken for E. lupercus 

 by Burmeister. The elytra are always rufo-castaneous, and the thorax unarmed in 

 both sexes, the latter being gibbous on the posterior disc, and minutely shagreened 

 (with some larger punctures) in the male, moderately convex, and more coarsely sculp- 

 tured in the female. E. endymion is smaller and of a narrower oblong shape than 

 E. pan, and the thorax is more regularly arcuated on the sides, the curve continuing to 

 the anterior angles, which are acute, but not produced as in E. pan. The Venezuelan 

 E. paniscus, Burm., is a closely allied species, or local form, in which the thorax in the 

 male is smooth and highly polished in the middle. 



We figure a male example from Tuxtepec. 



STRATEGUS. 



Strategus, Hope, Col. Man. i. p. 87, t. 1. fig. 5 (1837); Burmeister, Handb. der Ent. v. p. 128; 

 Lacordaire, Gen. Col. iii. p. 440. 



This genus is exclusively American, and found in the temperate zones north and 

 south, as well as in the tropics and the West Indies. Seventeen species have been 

 described, three of which inhabit Central America *. 



* The Munich Catalogue includes Mexico in the localities of S. antcsus, but I have not seen a Mexican 

 specimen. Dr. Horn, in his paper on the North- American Strategi, gives Texas as the southern limit of the 

 range of S. antasus. 



biol. centr.-amer., Coleopt., Vol. II. Pt. 2, December 1888. 2 UU 



