F THE LONE STAR TICK. 147 
an equalization of the humidity content of the air. Over the small 
glass tube a cotton cloth was tied to prevent the escape of the ticks. 
The records show that on May 6, 1908, 6 were alive and very active; 
from July 28 to August 29, 5 were found alive; from September 3 to 
September 10, 4; from September 18 to September 23, 3; from Sep- 
tember 28 to October 1, 2. The sole survivor died on October 11, 
1908, a period of 476 days or 15} months after having transformed 
to a nymph. 
TaBLE LXII.—Longevity of nymphs of Amblyomma americanum. 
Date molted or collected. Number. Date last larva died. ees 
Days. 
June 23-26, 1907, molted..............-.-.-- ON Octal LOOB Seka dactdecsee seer ccee 476 
PANTS Mey LOOS MONE so. isc - sess sls bakes sc GilwApE Ss 1909) Walive’c.ccsae a-sosecene 240+ 
Sept.271008, moltedis 5.6... 20 send ee aoe 6) Tumer24 towuly 13, 1909=--ss ees s5. 2.) 295-314 
Beptn28, 1908 ;molteds sii.) 2. ile eias <ister 3) Jane s0tosWeb.23; 1909 sa-— eee oee 131-155 
Sept. 21-23, 1908, molted:...:..-..---.--2--- 4) Jan: 22;tovHeb: 12° 19098 45222-25582 121-144 
Aug. 31 to Sept. 5, 1909, molted............. 0))) ABSley, Hayy IGT) WYGMING ose adec sk beee cee 189-196-++ 
Sept. 2; 1909, collected... .-.-.-2..+..----- 10} Feb. 28 to/May 20, 1910.25.22 22222-5-- 207-260 
The shortest period in which engorgement took place was three 
days, the majority dropping from the third to fifth days. 
TasLeE LXIII.—Engorgement of nymphs of Amblyomma americanum. 
os 
Nymphs dropped engorged—days following 
application. Total 
Date nymphs applied. Host. number 
dropped. 
LS eZ tov eee | Meo mln Orn igen eSis ee Olen GLO, 
Telly O73 Ss coe Be PLO ee Dore ae 01) OB OI Ol Ol OG Go 2 
UV LOOT, Aus Ml. jejse ae sec emes Bovinesss. |) On| On tay Sa One 07) (ON) 20s eeOn TO) 17 
URETOE Da a Ly oa eran Se eee ae aoe do. Oa ON MOR ON ete eel EON eee Onl ar0) 3 
Ate CINE RCL Gyo} 00 eens Be cee) ae ee Goma POU OM 4h 8a On Ouly Ol PnOb|ac0 19 
Ares 1.1908 jai ps Ml: 2 sishe. gees. =58 Rap itso. eaOh) ON On vale 0.) ON OulmONle <0 10 
Minne, LOO seis. ccs che Bape Seto 2.0 .- Bill sees OOM Oo One Onli Ohl eet tOn 10 2 
SPOUNY (AHO Ben ae copeesiatac oe Semmens (sae Gozec |) Onia0 LOR ee 1 Ose 25 ONO 6 
In August, 1907, molting commenced on the thirteenth day. In 
August, 1908, at a mean temperature of 84° F. molting commenced 
as soon as 16 days after dropping, a total effective temperature of 
657° F. being required. The longest period from dropping to molting 
recorded was 46 days. Winter temperatures lengthen the molting 
period considerably. 
