THE FOWL TICK. | 57 
Taste No. IX.—Molting of nymphal stages of Argas miniatus—Continued. 
MOLTING OF SECOND STAGE (THIRD ECDYSIS)—Continued. 
Temperature from drop- 
ping to date first tick 
molted. 
Second-stage nymphs molted—days 
following dropping (engorgement). 
Date second-stage nymphs |Num- 
engorged. ber. yi 
ee ey a Number | Maxi- | Mini- | “Vet@se 
177 | 183 | 184} 185 | 195 | 199 daily 
molted. mum. | mum. | moan. 
| Se ae, oh. 
OCHS L Tees See ee 9 | 13] 29] 18) 16) 1g) 0 25) 29) 2@).--..---|_--- seas fase daees 
PLT Ose ote GOB a ae San) - aateaes celts waters 0 0 0 0 Ones 3 oe See 87.0 47.0 70.91 
Mlyrols Apel O08. cl csec ne. aa|b cee a 0/0 10/0 |0 | 0} 8H\109) 0) 99.0) 73.0 86. 06 
PU LOS) ees to. the 2 18 | 0 0 0 0 0 0 | 55} 8Q| 4) ~=—:99..0 73.0 86. 61 
PATTEM G SL GUS Secon ue ea ane TAO) Ow) HO FO) | Ooi LO) tap) o9t0) |) 0 73h0 86. 64 
MOLTING OF THIRD STAGE (FOURTH ECDYSIS). 
Temperature from drop- 
ping to date first tick 
molted. 
Third-stage nymphs molted—days fol- 
lowing dropping (engorgement). 
Date third-stage nymphs Nam; 
er. 
engorged. ‘ Nie 
ber | Maxi- | Mini- | Average 
: ay a “ molt- | mum. | mum aily 
S ae - ‘| mean. 
8, 1a SE 
June) 20, 21,1908... -.. 22. - 2 2 0 0 0 29 2 89.5 71.0 80.73 
Ae.28; 29; 1908 - a2. --5-2-- 5 192 1g 29 19 5 97.5 75.0 83.98 
Observations are recorded by Nuttall and Warburton, who found 
all of 14 first-stage nymphs of this species to engorge and drop within 
35 minutes. 
Second-stage nymph (Table IX).—In our experiments second- 
stage nymphs lived longer than those in the first stage. Of two 
which molted July 31, 1907, and were kept in a pill box, one died 
duly 30, 1908. One nymph which molted from the first stage on 
June 15, 1908, was still alive February 23, 1909, when it was lost, 
thus having a longevity of at least 253 days. The last individual 
of a large number of first-stage nymphs which molted to this 
stage October 24-31, 1909, died January 12, 1911, thus showing a 
longevity of 445 days. The last tick of a lot of 12 which molted from 
the first stage November 1, 1909, died March 25, 1911, having lived 
509 days, or about 1 year and 5 months. At a mean temperature 
of 86° F. in August, nymphs of the second stage molted as soon as 
the eleventh day following engorgement, 473° F. of effective tem- 
perature being required. 
Third-stage nymph (Table IX).—We have found that about one- 
seventh of the individuals reared under similar conditions pass a third 
nymphal molt—i. e., of 49 individuals reared from seed ticks to adults 
7 passed a third nymphal molt. Six of these after molting proved to 
be females and one a male. 
