HAEMATOPJNUS TUBERCULATUS 549 



differences are mainly in the dimensions of the parts. In adventicus 

 the body as a whole is more stumpy ; the pre-antennal part of the head is 

 longer than in the type species, and the breadth of the thorax is greater 

 than the length of the head, while in suis the head is much longer 

 than the thorax is broad ; the abdomen is scarcely longer than broad 

 in the female, and as broad as long in the male. The chitinization 

 of the integument is more marked throughout in adventicus than 

 in suis. 



The subspecies adventicus is found not only on the domestic pig 

 in Asia and Africa, but also on the English race, a fact which, as 

 Neumann points out in an interesting note on the two forms, is related 

 to the predominence of Chinese blood in the present domestic pig of 

 England. 



Several species of Haematopinus are found on bovines in various 

 parts of the world. Neumann gives the following key for their identifica- 

 tion. 



1. Abdomen with pigmented and projecting pleurae. Anterior 



legs as strong as the others .......... 2 



Abdomen without pleurae. Anterior legs weaker than the 



others .............. 4 



2, A bunch of hairs on each side of the abdominal segments . H. tuberculatus, 



No bunch on each side of the abdominal segments ..... 3 



3, Abdomen twice as long as broad ...... H. bufali. 



Abdomen scarcely as long as broad . . . . . H. eury stern us. 



4. Two or three rows of bristles on each tergite and sternite of 



the abdomen. Head twice as long as broad . . . H. (L) vituli. 

 One row of bristles on each tergite and sternite of the abdo- 

 men. Head short H. (5) capillatus. 



//. tuberculatus, Giebel, (Plate LXVIII, fig. 2) is found on the buffalo in 

 India, Tonkin, Sumatra and Roumania. It probably also occurs on the 

 bison, and possibly on the camel. H. eurysternus is found on domestic 

 cattle, and may at times be a serious pest. The two species resemble 

 one another very closely, but may be distinguished by the following 

 points. In tuberculatus the head is relatively broad ; the thorax is 

 broader, the posterior angles more projecting, the sternal plate broader 

 than long and the anterior angles a little projecting ; long bristles on the 

 dorsal surface of the abdomen, a bunch of hairs behind each stigmal 

 plate ; in the female there is a ventral plate between the gonopodes, 

 in the form of a fleur de Us, broadest in the middle, narrowed in front 

 and behind, and preceded by a broad sub-tegmental plate. In eurysternus 

 the sternal plate is distinctly longer 'than broad, has three anterior 

 processes, and is a little constricted in the middle ; the plate between the 



