F. C. Bisiiopp and II. P. Wood 
167 
TABLE II. Incubation of Dermacentor albipictus in the 
laboratory at Dallas, Texas. 
Temperature during incubation 
Oviposition 
began 
Hatching 
began 
Period of 
incubation 
maximum 
Js _ 
minimum 
daily mean 
1910 
1910 
days 
°F. 
° F. 
°F. 
April 15 
May 20 
42 
91-0 
43-0 
71-22 
„ 20 
June 4 
45 
100-0 
43-0 
74-34 
„ 11 
„ 1 
51 
97-0 
43-0 
72-56 
„ 26 
„ 7 
42 
100-0 
58-5 
76-20 
„ 30 
„ io 
41 
100-0 
59-0 
76-88 
May 23 
„ 25 
33 
100-0 
60-0 
82-37 
1911 
1911 
Mar. 7 
May 11 
Go 
98-5 
49-0 
70-77 
Feb. 16 
April 20 
63 
98-5 
32-0 
66-12 
Mar. 28 
May 20 
53 
93-0 
52-0 
73-15 
April 23 
June 4 
42 
102-5 
56-0 
77-55 
Mar. 31 
May 25 
55 
94-0 
56-0 
72-70 
„ 20 
„ 17 
58 
93-0 
52-0 
69-57 
April 29 
June 9 
41 
102-5 
56'0 
79-91 
1912 
1912 
Feb. 27 
May 8 
71 
88-5 
35-0 
67-34 
Mar. 20 
„ 13 
54 
88-5 
39-0 
74-69 
„ 28 
„ 17 
50 
88-5 
48-5 
71-35 
April 4 
„ 18 
44 
88-5 
51-0 
72-87 
„ 12 
„ 26 
44 
95-0 
53-0 
75-69 
„ 16 
„ 27 
41 
95-0 
530 
76-12 
„ 25 
June 4 
40 
96-0 
60-0 
78-94 
„ 27 
„ 1 
35 
96-0 
60-0 
78-60 
May 3 
„ 9 
37 
96-0 
60-6 
79-99 
part of the range of this species, and in the higher altitudes the 
incubation period probably equals the longest period observed by us, 
and in many cases no doubt exceeds three months. 
The Larva (PI. XI, figs. 7, 9, 11) : When first hatched the larvae 
are pale brownish-yellow; the bodies are plump and the actions very 
sluggish. Hatching proceeds in about the order in which the eggs are 
deposited and the larvae remain on or near the egg mass after they 
emerge. They soon become dark reddish-brown and often move a 
short distance from the egg mass where they settle down in a dense 
bunch and remain quiet for some time. At Dallas the majority of the 
larvae remain in such bunches on or near the soil surface throughout 
the summer months. They are not easily disturbed and when left 
untouched for a short time they soon form a bunch again. As the 
cooler autumn weather approaches.they begin to scatter and crawl about.. 
