Some Ectoparasites in the South African Museum. 275 



POLYPLAX OTOMYDIS, Cummings (1912). 



Polyplax otomydis, Cummings, Bull. Ent. Res. vol. iii. pp. 395, 397, 



fig. 2 (1912). 

 32 $ $ , 60 5 5 , 32 imm. Otomys brantsi luteolus. 



We believed these to represent a new species, and were about 

 to draw up a description when our friend's excellent and beauti- 

 fully illustrated paper came to hand. Mr. Cummings notes that 

 P. otomydis stands close to P. sutimtlis, Osborn (Bull. 5. N.S., U.S. 

 Dept. Agric. p. 185, 1896). It is distinguished, however, by its larger 

 size, the shape of the abdomen, etc. Cummings' types in Brit. Mus. 

 Coll. (? $ only) were taken on Otomys irroratus tropicalis, Thos., in 

 British East Africa, northern slopes of Mt. Kenya, 7,200 ft. (S.A. 

 Neave). The insect, however, does not appear to vary. 



One of the above $ 3 has been added to the national collection, 

 from which a duplicate ? has been presented by the trustees to the 

 S.A. Museum. 



GEN. LINOGNATHUS, Enderlein. 

 Linognathus, Enderlein, Zool. Anz. xxix. p. 194 (1905). 



LINOGNATHUS TIBIALIS, Piaget (1880). 



Haematopinus tibialis, Piaget, Les Pediculines, p. 646, pi. Hi. f. 8 



(1880). 



L. TIBIALIS EUCHOEE, var. nov. 



44 3 $ , 156 ? ? . Antilope eucliore. 



Although evidently belonging to the tibialis type of Linognathus 

 these specimens seem worth separating as a variety of Piaget's 

 unfortunately not too clearly defined species. We have thought it 

 best to describe this form with some detail, indicating where it seems 

 to differ from Piaget's description of his types which were taken 

 from Antilope maori (Jardin Zool. de Rotterdam). In the same 

 "Zoo" Piaget also found two forms which he considered to be 

 varieties of his tibialis, viz. : 



1. var. antennata on Antilope, sp. 



2. var. appendiculata on Antilope subgutturosa. 



Mr. Cummings writes that he has not yet seen what he considers 

 to be typical tibialis. 



We have evidently on Antilope, spp., a series of slightly differing 

 forms whose precise status is probably to be determined only by 

 a critical examination of the chaetotaxy and $ genitalia. 



$ . Head. Before antennae, moderately produced, triangular, 



