1863.] MR. W. W. READE ON THE DERBYAN ELAND. 169 



This makes six species of Calliste now known to inhabit Central 

 America and the Isthmus of Panama, viz. C. larvata from the hot 

 forest-region of the Atlantic side of Guatemala, C. francescce * from 

 Costa Rica and Veragua, C. dowii from Costa Rica, C.frantzii from 

 the same country, C. gtjroloides, a species ranging from Costa Rica 

 to Bolivia, and C. inornata from Panama to the Isthmus of Darien. 



The single specimen of this Calliste now described was procured 

 by Capt. J. M. Dow, Corr. Mem. Z.S., at San Jose, the capital of 

 Costa Rica, during a short visit he paid to that city in the early 

 part of the present year, and by him most kindly presented to me. 

 He was unable to inform me exactly whence it came ; but it was most 

 probably obtained from the low forest-region of the Atlantic slope. 



I dedicate the species to Capt. Dow, whose researches in the ma- 

 rine fauna of Central America are too well known for me to need to 

 dilate upon the justice of the appellation. 



5. Notes on the Derbyan Eland, the African Elephant, 

 AND THE Gorilla. By W. Winwood Reade, F.S.A.L. 



(Plate XXII.) 



1. The Derbyan Eland (Oreas derbianus. Gray). 



When I was on the Casamanza, a river of Senegambia, in December 

 1862, I was informed of the existence of an enormous Antelope, 

 double the size of the Senegal Bullock, with horns lying backwards, 

 a black mane, and white stripes on its sides. My French host in- 

 formed me that it was unknown in France, which is quite true, as, 

 in fact, its very existence has been denied by French naturalists. I 

 asked where this animal was most abundant, and was told in the 

 bamboo-forest of Bambunda, about fifty miles north-east of Sedhu, 

 where I was staying. I immediately rode over to a village called 

 Missera, situated on the borders of the forest, taking a rifle with me. 

 The hunters of that village told me that at that time it would be im- 

 possible to kill the Djik-i-junka, the bush being dark, as they expressed 

 it ; but that in a few weeks they would burn the tangled under- 

 growth of the forest and the high grass of the plains, according to 

 their annual custom. They would then have a battue; hundreds of 

 people would collect, and animated nature, towards the close of the 

 day, would be driven into a large plain. There Antelopes, Gazelles, 

 Wild Boars, Porcupines, &c., would be found so exhausted that many 

 of them could be killed with sticks ; and indeed only a limited number 



* I had considerable doubts whether this species was really separable from 

 C. larvata, but, having examined a number of skins of both species, have come 

 to the conclusion that the distinction, small as it is, is constant. Dr. Sclater 

 has pointed out in his ' Monograph ' what the differences are, to which I may 

 add that C. francescce seems a lighter rather than a brighter bird than C. larvata ; 

 the blue on the forehead is a trifle broader in the former ; and the outer bluish- 

 green margin to the middle wing-coverts of the latter is almost obsolete in the 

 former. In fact, there is just a difference, and that is all. 



