520 Genus Haemaphy salts 



cited. Stockman's records were somewhat confused and it was not 

 always easy to extract the desired information from them. 



Seasonal occurrence on hosts. The specimens which have reached 

 us have been adults collected in April. According to Stockman, in 

 Kent and Devon, engorged females are found on sheep in April-June, 

 in October and occasionally at other times of the year; engorged 

 nymphs were found in ]VJay and August. Judging from observations at 

 the Alperton laboratory on material collected at various times in the 

 field, the ticks not being incubated during metamorphosis. Stockman 

 concludes that larvae which feed and moult up to May, nymphs which 

 feed and moult up to July, and adult females which feed and oviposit 

 up to August, are all derived fi-ora eggs hatched the previous year. 

 The lar\ae which hatch out, feed, and moult from July onwards, the 

 nymphs which feed and moult from August onwards, and the adults 

 which feed from October onw^ards are presumably all derived from eggs 

 of the same year. All eggs laid in February, May and June hatched in 

 July and August. Stockman believes that in nature the different 

 stages emerge and feed as follows: the larvae do so chiefly in July and 

 August, the nymphs in August-October, the females in October- 

 November, but all stages may hibernate (fed or unfed) and appear on 

 hosts in the spring. The females oviposit mainly in the spring. 

 Starting with eggs laid in the spring, the ticks, according to Stockman, 

 probably pass the next winter as gorged nymphs, and feed as adults in 

 April-^Iay of the following year, the cycle presumably lasting about 

 290 days. 



Further observations made in the field appear to me required before 

 definite conclusions can be arrived at; until such observations are made 

 Stockman's hypothesis, based almost purely on laboratory experience, 

 can scarcely be accepted. J 



The time H. cinnabarina var. punctata remains upon 



the host. (Nuttall.) 



