418 
Bioloffii of Txoflidae 
Sxinimary. 
Amblyoimna hebraeum requires three hosts upon which to feed in its 
larval, nymphal and adult stages. We have had no difficidty in rearing 
the tick under experimental conditions. The larvae attach them¬ 
selves readily to sheep and hedgehogs; nymphs were fed on sheep, goats 
and calves; adults were fed on calves and sheep. The larvae remained 
12-17 days (mostly 13-14 days) upon a hedgehog maintained at ca. 18° C. 
in September; in January, they remained 27-42 days (mostly 35 days) 
upon a hedgehog at 12° C.; when placed on rams, maintained in a stall 
at 3-4° C., in January-February, they remained upon the host 5-19 
days, mostly dropping off gorged on the 8th day. Over twice as many 
gorged larvae abandoned a ram by day (1700 larvae) than they did by 
night (711 larvae); counts made during four successive nights and days 
all showed that more ticks dropped from the host during the daytime; 
as the ticks fell into a sack containing the ram’s scrotum, and as they 
were not exposed to light, the larger number abandoning the ram by 
day appears clearly attributable to the ticks being shaken off by the 
ram whilst moving about more actively during the day. The nymphs 
remained on rams for 5-18 days, mostly 6-7 days; they remained 6-22 
days on goats; they remained 4-12 days on a calf, mostly 5-6 days; 
the temperature at which the host is maintained slightly influences the 
nymphal feeding period, since the nymphs remain somewhat longer 
upon the host in cold weather than they do when it is warm. The 
females remain 6-12 days upon the ears of calves which had been 
previously infested with ds; of 50 c?s which were timed, 21 remained 
upon the calf for 8 days, 10 for 7 days, 8 for 9 days, 5 for 10 days, 
3, 2, and 1 dropping off on the 6th, 11th and 12th days respectively. 
The time the 9 remains attached is influenced as in the other stages, 
by the blood supply obtained at the point where it attaches itself to 
the host; the character of the host appears also to exert an influence 
upon the duration of parasitism. [Lounsbury found that 9s remained 
on the belly and udder of cows usually for 8 days, and on sheep and 
goats for 9-10 days; they may remain attached as long as 25 days 
to the legs and feet of goats.] Males remained 41-267 days [Lounsbury 
records 105-355 days] upon the host, i.e. they persist upon the host 
long after the latter has been abandoned by the 9s. The ds may 
remain in situ and die upon the detached hide of a host. Copulation 
takes place upon the host; a (J may copulate with several 9s, and, as 
Lounsbury first showed, it is only ds which have been attached for 
