56 LIFE HISTORY OF NORTH AMERICAN TICKS. 
Nuttall and Warburton found that two-thirds of the nymphs and 
adults engorged within 30 minutes. In observations of 148 nymphs 
these workers found 120 minutes to be the longest period required 
for engorgement. 
First-stage nymph (Table [X).—The longevity of first-stage nymphs 
was found in one instance to be as great as 269 days. Of 29 
first-stage nymphs, which molted between July 28 and 31, 1907, and 
were kept in pill boxes, 14 were found to be alive on October 12, 
5 having escaped and 12 being dead. Of the 14 remaining alive 
3 escaped, the others succumbing as follows: Two on November 14, 
1 on November 21, 1 on January 1, 1 on February 18, 3 between 
March 27 and April 16, and the last one on April 25, 1908. A large 
number of first-stage nymphs which molted from larvz October 3-8, 
1909, were all dead by April 22, 1910, thus living slightly over 6 
months. The greatest longevity recorded in a lot of 88 first-stage 
nymphs which molted from larvee November 7-12, 1909, was slightly 
over 9 months. 
TaBLeE No. IX.—Molting of nymphal stages of Argas miniatus. 
[#=Male. 9=Female. @=Nymph.] 
MOLTING OF FIRST STAGE (SECOND ECDYSIS). 
Temperature 
First-stage nymphs molted—days following dropping (engorge- | from dropping 
ment). to date first tick 
ee. s molted. 
first-stage Se 
aeipsed Num lea ae 
7/8 | 9 }10| 11/12] 13] 14| 15] 16] 17| 20] 23} 24] 25/26]08} ber |Maxi-| Mini-| age 
molt- |mum.}/mum.| daily 
ed. mean, 
ad La lanes! On| ey 
Aug. 28, 29, LTO QE Aon LOM Oe On TOL -On On F On) On Onl "On ro DaL | ot Ss ea] Se | oe 
TOOT Sou ose 
Sept. +1, 2, | ES 
LOOK ee ec LOO eZee Sa Sel OnV On On On On Onc O2 Ons iKe AK O))} (eens) [Bee ey (eo 
Apr. 23, 24, 
AGUS Fee Fg ee 0:} 0) 0} 0 | 0 )10)) 0) O 0) 0) ) 0.2.) 2) De a) 4 11 | 86.0 | 47.0 69.3 
May 20, 21, 
DOOR fe ois tic . oe OL) },0! |) Onl 2A seh Ee eS ON) On KON OuNO EGO 18 | 86.0 | 68.0 17.5 
July 20, 21, 
OB ae toe 37 118 18 |}0)4);0/1);0/0)}0;0}1;/0}0/0|0;0]0 37 | 95.0 | 76.5 | 84.6 
MOLTING OF SECOND STAGE (THIRD ECDYSIS) 
Second-stage nymphs molted—days following dropping (engorgement). 
Date second-stage |Num- 
nymphs engorged. ber. 
11 | 12] 13 | 14] 15 | 16 | 17 | 18 | 19 | 20 | 24 | 26 | 30] 33 | 36 | 37 | 43 
Oct. 3,4, 1907.......--- 910 |o lo jo Jo lo Jo Jo |o Jo Jo Jo Jo Jo Jo Jo Jo 
Aprs24; 25) 1908:...0--5 (4255.2 onho: boc} ollie ho haalie athe lado re 1S |}18 1g/1 lag 
July 31, Aug. 1, 1908....]......| 3¢ {i$ ea do }o 19/0 |o |o |o J19!0 Jo Jo Jo Jo Jo 
Aug. 4,5,1908.......--. is|o | 0 3@ {58 12 io ig to 2 gif o lo Jo Jo Jo Jo Jo 
Aug. 6,7, 1908.........- 7/0 |o |o Jo 1B {1S \ig 0 |o |igio |o |o Jo Jo Jo Jo 
