68 



Ghssina palpalis, G. morsitans and G. fusca are met with in the 

 Welle district. From dissections of specimens of G. fusca and hj 

 comparing the position of the trj-panosomes in this species and in 

 G. palpalis, G. morsitans, G. brevipalpis, etc., it may be assumed that 

 G. fusca transmits trypanosomes of the types cazalboui, congolense 

 and pecaudi. 



Various forms of piroplasmosis occur in cattle, sheep, dogs and 

 antelopes. In cattle the two types found were Piroplasma bigeminum 

 and Theilena mutans. All the cattle in Welle have come originally 

 from Lado or Aru, to the east and it is probable that the infection is 

 endemic in these districts. The piroplasma of sheep, T. ovis, approaches 

 T. mutans in its morphological characters. When inoculated into 

 the blood of young animals, slight infections are produced which are 

 followed by immunity. The parasites can persist in the blood of the 

 host for long periods ^\'ithout affecting the general health, but in some 

 cases may produce fatal results in a short time. Further researches 

 with previously uninfected animals are necessary in order to determine 

 the action of Ixodes in the propagation of the disease. Among the 

 antelopes examined, two specimens of Cobus defassa showed parasites 

 similar to T. 7nutans. A dog w^as found to be infected with 

 Piroplasma canis. 



The following blood-sucking Diptera were collected by the author :--- 

 Stonioxys calcitrayis ; Lyperosia minuta and L. punctigera, feeding on 

 Rhinoceros simtis, Bubalis lelwel jacksoni and Cobus defassa ; Ghssina 

 palpalis, G. morsitans, G. fusca ; Chrysops silacea, C. distincHpennis, 

 C.funebns, Tabanus socius, T. secedens, T. ruficrus, T. biguftatus and 

 species of Haetnatopoia {Chrysozona). 



Hirst (S.). On the "Harvest Bug" {Microtrombidium autum- 

 nalis, Shaw). — Jl. Econ. Biol., London, x, no. 4, December 1915. 

 pp. 73-77, 2 figs. [Received 28th February 1916.] 



Specimens of Microtrombidium autumnale, Shaw, (hai^vest bug) 

 were obtained by the author in the Isle of Wight during September 

 1915. This mite is very troublesome in the district and occurs chiefly 

 on the high chalk downs in the neighbourhood. Residents are believed 

 to become immune to attack after long sojourn in affected districts. 

 A description of the larval form is given. In France, in addition to 

 M. autumnale, MetatJirombidium p)o^icep)s, Oud., and Trombidium 

 striaticejjs, Oud., have been recorded as attacking man. 



Hirst (S.). On the Tsutsugamushi {Microtrombidium akamushi, 

 Brumpt), Carrier of Japanese River Fever.— Jl. Econ. Biol.y 

 London, x, no. 4, December 1915, pp. 79-82, 2 figs. [Received 

 28th February 1916.] 



The larval forms of Trombidiidae occurring in Japan are capable 

 of transmitting Kedani or River Fever. In this paper a description 

 is given of the larv-al form of Microtrombidium akamuslii, Brumpt, 

 taken from the ears of field mice. At least four other species of the 

 genus Microtrombidium are known from their larval forms in Japan. 



