HEMIPTERA 339 



their having been in their passage wetted with the spray of the sea, which, 

 when it was dry, left the salt behind it in a fine white powder. 



During the period of the war a considerable increase in the preva- 

 lence of this pest has been noted. It is no doubt due in part to the 

 use of the public lavatories in trains and railway stations by infected 



men. 



Hcematopinus ventricosus, Denny. Rabbit Louse 



This louse has probably been here since rabbits were first intro- 

 duced. In 1889 Mr Coleman Phillips attributed the decrease of the 

 rabbits in South Wairarapa in 1885-86 largely to the prevalence of 

 this insect-pest, in association with Sarcoptes cuniculi. 



Hcematopinus eurysternus, Nitzsch. Ox Louse 

 This parasite has been reported by the Agricultural Department 

 for many years past, as being common both on cattle, and pigs. The 

 latter occurrence is not given by Colonel Reid, and I think, therefore, 

 that it is doubtful. 



Hcematopinus macrocephalus, Burm. (H. asini). Horse Louse 

 This species is commonly found on horses all over the Dominion. 



Hcematopinus vituli, Linn. (H. tenuirostris). 



Long-nosed Ox Louse 



Colonel Reid informs me that this species occurs on cattle in 

 New Zealand ; and Mr Miller states that it was met with at Weraroa 



in 1917. 



Hcematopinus ovillus, Neumann 



In 1906 this louse was found among sheep in the South Island, 

 but was not identified with any described species. Specimens were 

 sent to Dr Neumann who described it (Agricultural Report for 1908, 

 p. 194) under the above name. This species is found among sheep 

 in Scotland, from whence, no doubt, the parasite was introduced, 

 but where it was not previously identified. 



Hcematopinus pedalis, Osborn 



Colonel Reid states that this species occurs among sheep in New 

 Zealand. 



Hcematopinus urius, Nitzsch (H. suis, Linn.). Pig Louse 

 All the authorities are agreed that this louse is very common among 

 pigs in New Zealand. 



Hcematopinus pilferus, Burm. Dog Louse 



Dr Reakes and Colonel Reid inform me that this species is com- 

 mon on dogs. 



