1897.] REV. O. PIOKAED CAMBRIDGE ON A NEW ACAUIDEAN. 939 



58. ^prcEROS iiELAMPUs, Licht. 

 rt. 2 . Zomba, 2/3/97. 



Shot by Mr. J. Charles Casson. 



59. HiPPOTRAGUs NIGER, Harr. 



a. Ad. d . Zomba Plains, 10/10/96. 



A very fine example, though the horns are unfortunately unsym- 



me 



trical. 



60. Tragelaphus angasi, Ang. 

 a. Imm. cJ . " Lower river." 

 Shot by Mr. Alfred Sharpe. 



61. Ortctbropus afer, Pall. 



a. 1mm. d • Shirwa Plains, 15/10/96. 



"This is the first ' Earth-pig' we have met with, though we 

 have done our best to get it before. It is found on the plains, 

 where it makes enormous burrows, and also inhabits caves under 

 rocks. It seems lighter in colour than Cape specimens, and the 

 hairs are but little bristly. Native name Mhaive." — A. W. 



3. On a new Genus and Species of Acaridea. 

 By Eev. O. Pickard Cambridge, M.A., F.R.S., &c. 



[Eeceived October 26, 1897.] 



(Plate LV.) 



The singular Acarid of the family Trombidiidse now described 

 was kindly sent to me by the Eev. A. E. Eaton, who found it, 

 along with another, running on sandy ground amongst tamarisk 

 bordering the river-bed near Biskra in Algeria. Mr. Eaton writes 

 that " in running it elevates the hindermost legs, which being 

 quickly agitated, the tufts of hairs on the metatarsi look like a 

 pair of minute Diptera dancing attendance on the mite." 



Gen. nov. Eatostia (nom. propr.). 



Eorm obtuse-oval, tolerably and uniformly convex above. 

 Caput and thorax coalescing \\ ith scarcely a trace of junction. A 

 pointed nasiform process issues from near the middle of the anterior 

 margin, and from this process to the hinder extremity of the caput 

 is a deepish longitudinal furrow or indentation bisecting the caput. 



Eijes 4, in two groups of two eyes each, seated on either side of 

 the ( aput on geminated tubercles. 



Legs slender, 1, 2, 3 short, 4 long. Two on each side issue 



62* 



