Gr . H. P\ Nuttall 
89 
Longevity of larvae and males. 
Larvae, the progeny of the females referred to in the protocol on p. 82, were kept in the 
corked tubes in which they hatched in August (Lot a) and July 1911 (Lot h) respect¬ 
ively. Maintained in cork tubes with dampened filter paper at an average temperature 
of 12°C. 
Progeny of 
? No. 
Larvae survived 
unfed for 
1 
321 days 
o 
346 
3 
348 
4 
319 
1 
168 
2 
321 
5 
287 
6 
294 
8 
293 
15 
291 
16 
312 
18 
311 
19 
291 
21 
145 
25 
316 
Males captured at the same time as the females were placed with them in separate tubes. 
Of the 4 males in Lot a, 2 survived for 22 and 33 days respectively. Lot b included 
24 males of which 16 survived a sojourn of 5 days with the females with which they 
copulated. These males were separated from the females and placed in corked tubes 
at laboratory room temperature. They survived as follows : 
2 lived for 6 days 
1 „ 9 „ 
1 ,, ■ 16 „ 
2 „ 13 „ 
1 „ 15 „ 
1 „ 17 „ 
2 lived for 29 days 
1 j) 33 ,, 
1 38 „ 
1 „ 47 „ 
2 ,, .56 ,, 
1 „ 123 „ 
Summary. 
Owing to repeated failures at raising Ixodes canisuga upon laboratory 
animals (birds and mammals) the life history of this species was not 
completely followed. In common with other species of Ixodes whose 
life histories we know, it requires three hosts upon which to feed in the 
larval, nymphal, and adult stages. There is no evidence that the males 
feed upon the host for they have never been found upon the latter. 
Copulation occurs in the nests of the sandmartins, the process being 
similar to that observed in other Ixodes. Oviposition takes place 
