WARBURTON— THE ACARINA OF THE SEYCHELLES 



359 



all new. These he named H. hraueri (37), H. seychellensis (38) and H. niger (39), the 

 last-named being only represented by the male. All three species occurred in the 

 material here dealt with, which also furnished what is apparently the female of H. niger 

 and a new form described below as H. gardineri. 



39. Holothyrus nigei- Thon, $. (Text-figure 4.) 



Of the colour and general appearance of the $, but destitute of its leg armature and 

 slightly smaller (about 5 "8 mm. in length). The genital armature (text-figure 4) is of 

 characteristic design. The median plate (hauptplatte) is unusually small, the anterior and 

 lateral plates encroaching much upon it. It is produced forward antero-laterally into two 

 cornua which entirely separate the anterior plate from the lateral plates, and its sides are 

 deeply excavate for the reception of the unusually broad lateral plates. 



Four specimens in company with several males, from Silhouette. 



40. Holothyrus gardineri, n. sp. (Text-figures 1 — 3). 



Fig. I. 



1 2 4 



Venter of //. gardineri (J. Fig. 2. Legs I and II, and tarsi III and IV of H. gardineri <?. 

 Fig. 3. Genital plate of H. gardineri ? . Fig. 4. Genital plate of H. niger $ . 



Male about 4 mm. in length, black-brown, not highly polished. Genital area in 

 general design like that of H. longipes but with the prominences at its postero-lateral 

 limits much more salient. Peritreme broadest in the middle and tapering to either end. 



Legs moderately long and slender and only sparsely clothed with hairs ; leg 1 with 

 the tarso-metatarsus of the same colour as the rest of the animal and only slightly dilated, 

 and with a fairly strong spur under the distal end of the patella ; tarsi of legs 2, 3, and 4 with 

 three terminal spurs, two being more or less dorsal and the third lateral on the external 

 side, and small conical spur on the under surface towards the distal end — very small on 

 leg. 4. 



Female about 4-5 mm., of the colour and general appearance of the male, but with 

 the legs destitute of the patellar and infra-tarsal spurs. Genital area large, the median 

 plate very broad, with sides almost rectilinear, and its anterior border a sinuous transverse 

 line. Lateral plates very small and narrow ; anterior plate very broad and shallow. 



Two $ and two $, taken in the jungle, Mah6, at an elevation of over 1200 ft. 



The details of structure recall H. longipes Thorell, but the legs are not especially 

 long, the anterior leg of the male measuring about 5 mm. 



I have named this species after Professor J. Stanley Gardiner. 

 SECOND SERIES— ZOOLOGY, VOL. XV. "^6 



