Bibliographical Notices. 411 



hairs, and with a smoother longitudinal area having a faint 

 impression along the middle. There are two transverse 

 shallow depressions across the surface. On each side there 

 are three small, blunt, horizontal spines, the front two having 

 a common base and the third separate. On the front margin, 

 and situated on each side not very far in front of the anterior 

 two of the lateral spines, are two small, blunt, and horizontal 

 spines contiguous at the base. Scutellum broad, with apex 

 rounded, and the surface very finely granulate. Elytra broader 

 at the base than the prothorax, more shining than the prothorax, 

 punctate-striate, the punctures being deep and rounded. The 

 whole surface is tuberculate, the tubercles being more promi- 

 nent on the apical area. Each lateral margin with about 

 eighteen minute teeth, each apical margin with four or five 

 spines of gradually increasing length. Underside subnitid, 

 mid-tibiae curved. Claws minute, but distinctly separate and 

 brown. 



Length 3^—4 mm. 



Mt.Chirinda, S.E.Mashonaland, Nov., Dec. 1901 (G. A. K. 

 Marshall) (type) ; 1 specimen. Grazaland, Dec. 1901 ; 2 

 specimens. Upper Buzi River, S.E.Mashonaland, 25. ix. 1905 

 (6r. A. K. Marshall) ; 3 specimens. 



Type in the British Museum. 



BIBLIOGRAPHICAL NOTICES. 



Studies on Acari. — No. 1. The Genus Demodex, Oiven. By Stanley 

 Hirst. Published by Order of the Trustees of the British 

 Museum (Natural History) . London, 1919. iii-44 pp., 13 plates, 

 and 4 text-figures. Price 10s. 



This memoir, dealing with skin parasites of microscopic size, 

 represents the first part of the Author's studies on parasitic Acari. 

 Although the detection of these creatures is not easy — living, as 

 they do, embedded in the skin of their hosts, — Mr. Hirst has had 

 considerable success in finding his material, and has thus sub- 

 stantially extended our knowlodge of mammalian hosts affected by 

 this particular form of parasite. 



The matter is well arranged ; the first few pages are devoted to 

 an outline of the frequency of occurrence and effects of the 

 Parasitism on the Host, dealing with Demodex: and Man, and 

 Follicular or Demodectic Mange of the Dog (and its treatment), 

 Cat, Horse, Cattle, Pig, and the Goat. Then follows a brief 



