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 larve 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 larve November 7-12, 1909, was slightly 
over 9 months. 
TasLE No. IX.—Molting of nymphal stages of Argas miniatus. 
[f=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 
ake molted. 
first-stage aes 
nymphs : Num- Aver- 
or 718| 9 |10|11| 12/13} 14/15] 16|17| 20] 23} 24] 25/26] 28] Per )Maxi-| Mini) age 
A mee molt- |mum.|/mum.] daily 
ed. mean. 
ont es ee hs 27 
Aug. 28, 29, 11SEC OY | 28 fae aca EM ALCO COS COA COSTS O MIMO I COON ) pele) ALI tees ee He 
1907s ooo 
septs. 1 22: 
LOD Fees: ss 10) |) .0)). 2:4 L 2a | 34-0) | O10) | (0) })0))) 0) 0) 0) 10) 10))|, 0 OW Bee eS eee 
Apr. 23,° 24, 
OOS eis Sakae POT OO OO OHO NEO ORO Per at I IT eZee a 11 | 86.0 | 47.0] 69.3 
May 20, 21, f 
S082 ee | ee ON} OF ONO} 24. |) 4s) Se sOn0: | OnlKO nO 18 | 86.0 | 68.0] 77.5 
Huly; 205-21; 
O08 5 cs 2 37 (18 [13 |}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- 
Lhagh Teapot IEF 11 | 12} 13 | 14] 15 | 16] 17 | 18 | 19 | 20 | 24 | 26 | 30] 33 | 36 | 37 | 43 
Oct. 3,4, 1907....-.-.-- gio 0°10 | FO. [ole | 0 hor lone Lo 0 lo Jo Jo 
Apr. 24,25, 1908......-- feos? 0 |o Jo Jo }0 0 jo Jo lo Jo Jo 19 {1g Me ig|1 |2¢ 
July 31, Aug. 1,1908....|......] 3¢ ig Bo do hho 1910 |o |o |o J1ieio Jo Jo Jo Jo Jo 
Aug. 4,5,1908.........- ]o Jo |3@is! 73] 73] 1S Lol Ls}o fo jo |o Jo |o Jo Jo 
Aug. 6,7, 1908........-- 7/0 Jo Jo Jo J1i@x{igflra]o Jo |1a}o Jo }o Jo Jo Jo Jo 
