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. 
TaBLeE LXII.—Longevity of nymphs of Amblyomma americanum. 
z i Pye Nymphal 
Date molted or collected. | Number. Date last larva died. longevity. 
b. 
| Days. 
anne 23-26) 1907, molied. * ... 2-22-22 -2--5- SO) set ab totes 20 oo tS fae 176 
ee tt tm nolted........).. 4... --.----- | mi Soe: 1s, 1008s ‘alive 2 2. 2S 240+ 
Sept. 2, 1908, molted................-------- | 6 | June 24 to July 13, 1909...............- | 295-314 
Sept. 21, 1908, aMgmtCg eee ene LAL = | aa. 30 te Pep 225 1908 Ss ese oS | 131-155 
Sept. 91.23, 1908, PLN et 2 Sap eed aes ee ee 4) dan 2? te. Feb 112 1909... 8 5. 2 3 121-144 
Aug. 31 to Sept. 1009 -HONieR et: 3353222: as} Mebs ls, 1918 Salive..- . <2. 22 189-196+ 
Sept. 2, 1909, 8 SE ie OES 10)| Feb.28 to May: 20, 1910... ...:.....-..1 207-260 . 
The shortest period in which engorgement took place was three 
days, the majority dropping from the third to fifth days. 
TaBLeE LXIII.—Engorgement of nymphs of Amblyomma americanum. 
Nymphs dropped engorged—days followi ing | 
application. | Total 
Date nymphs applied. Host. number 
dropped 
1/2)3/4/5|]6)/7)]8]9 | | 
j | 
/ | | 
Lae ee ae Dor... 0] Oo] 2} 0] 0O| O| oO] Oo} Of} Oo 2 
OO ET a Se eee Bovine.....| 0} 0|14| 3} 0/ O| 0} 0} O| 0} 17 
June 15, 1908, 5 p.m Soe Seed & eee Gecear @) St Or ei sr 2) at ba ol eI 3 
oe a eee ae do....| 0) O| 4) 8] 7] 0} O| 0; 0} OF 19 
aires 1908: So. TN 2. oe Se Rabbit Pe Ore ges he Oe hve se 10 
NETS ER a Bull... 0} o| o| o| o 1} 0} 1] O| Oo 2 
RTS Ree, aan 2 oie do. 0 Oo 2 0 | iil 6] 3 0 | 0 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. 
