262 Mr. J. E. Gray on some new Genera 



nagerie of the Earl of Derby, and a dead one in the British Museum ; 

 it is very different from the figure of the Indian A. fasciculata figured 

 in Hardwicke's drawing, and copied in my * Illustrations of Indian 

 Zoology/ 



Sphig gurus melanurus. Spines yellow with black tips ; fur black- 

 ish, with scattered yellowish gray stronger hairs covering the spines ; 

 the feet, and the bristles on the lower sides of the base, and of the 

 whole of the middle of the tail black. Length, body and head, 15 

 inches; tail, 10. 



Hab. Brazils, Lord Steuart. Brit. Mus. 



This species differs from the three specimens described by Brandt 

 in the colour of the tail. 



Alactaga Indica, Gray. Back dusky; hairs yellow at the end and 

 black at the tip ; sides bright yellow, some of the hairs black tipped ; 

 tail yellow, some of the hairs of the tuft black tipped ; the pads under 

 the toes of the hind feet are compressed, with 3 to 5 grooves on each 

 side, and crenated on the front edge ; the pad under the sole is large, 

 conical and smooth ; the underside of the end of the tail under the tuft 

 with a quantity of short, rather rigid, spreading hairs. Length, body 

 and head, 3" 6'" ; hind feet, 2" 0'"; ears, 1" 4±'"; tail, 6" 0'". 



Hab. India, Candahar, at Quettah. 



It agrees with A. acontium in size and in the length and propor- 

 tion of the hind feet, but it differs from the specimens both of it and 

 A. vexillaris in the British Museum in being yellowish, and in the 

 hairs of the tuft of the tail (which remain) being yellow with black 

 tips, while in those species the black hairs are one-coloured to the 

 base ; and the specimens of A . vexillaris indicate no appearance, and 

 A. acontium very slight indication, of the very peculiar form of the 

 pads to the hind toes, so strongly developed in the Candahar spe- 

 cimen. 



Fam. Jerboid^. 



Pteromys Derbianus. Blackish brown, gray grisled ; hairs dull 

 black-brown with whitish tips ; shoulders whitish ; tail and feet black, 

 tail round ; chest, belly, inside of the limbs to the edge of the mem- 

 branes grayish white ; membranes nakedish below (like back above), 

 with a straight edge to the one between the back of the thighs and 

 the tail, and a lobe supported by a cartilage in front; head above 

 and below, and the upper part of the neck blackish gray ; cutting 

 teeth yellow. Length, body and head, 14 inches ; tail, ? 



Hab. W. Africa, Sierra Leone, Mr. Whitfield. Museum of the 

 Earl of Derby. 



Sciuropterus caniceps. Blackish brown, varied with red bay ; hairs 

 long, dark blackish, with red bay tips ; outside of the legs redder, 

 beneath reddish yellow ; head iron -gray with longer black inter- 

 spersed hairs ; throat white ; chin black ; small lunate spot on the 

 upper edge of each eye red, and roundish spots near the base of the 

 ears bright-red; tail flattish, black, with some reddish tipped hairs, 

 fewer near the end. Body and head, 9 inches ; tail, &J. 



Hab. India, Dargellan, Mr. Pearson. Mus. Ind. Comp. 



Young or n. s. About one-third smaller in length and breadth ; 



