140 
Parthenogenesis in Ticks 
Nevertheless, from some of the eggs larvae duly emerged. Partheno¬ 
genesis, therefore, occurs in R. bursa, a small proportion of the eggs laid 
by a female giving rise to larvae. 
In a paper by Oudemans (1908), to which my colleague, Mr 
Warburton, has drawn my attention, the author discusses the subject 
of parthenogenesis in Acari. According to Oudemans, Richard Beck 
(1866) is the only writer who appears to prove that parthenogenesis 
occurs in this group. If Beck’s statements are true then he observed 
parthenogenesis in Cheletes erudites (sic). Berlese (1881) states his 
belief in the occurrence of parthenogenesis in Acari, but offers no proof 
as he did not carry out breeding experiments. Trouessart (1894) states 
that parthenogenesis occurs in Syringobia, but Oudemans says that 
Trouessart did not recognize the males. 
REFERENCES. 
Aragao, H. de B. (1912). Beitrage zur Systematik und Biologie der Ixodidae. Mem. 
do Inst. Oswaldo Cruz, iv. 96-119, 2 pis., 6 text-figs. 
Oudemans, A. C. (1908). Notes on Acari. Tijdschr. voor Entomol. li. 71. 
