128 LIFE HISTORY OF NORTH AMERICAN TICKS. 
host dropping on the eleventh day. Upon a cold-blooded host the 
period of engorgement will undoubtedly be found to be much longer, 
as was found to be the case with Ambylomma dissimile. Attempts to 
get nymphs to attach to a horned toad were unsuccessful. 
TABLE XLVI.—E£ngorgement of nymphs of Amblyomma tuberculatum. 
Nymphs dropped engorged—days following 
application. Re 
Date nymphs applied. Host. ae ag 
1/2/314/5]/6]7{18]9]10/1| Ped 
SADT Ae OOS ie. Seam a. cents ntain (emi Bovine....} 0 0 0 OF} Ok Ont cOn OF Gul: 75 2 7 
aot USS LOS cla tera sis ernie eral aisle Poin seeedOwnens 0 07 OF OF On) “One 1 2 Ej eee 8 
SEES SAT) Re AM A CE Wiadast + 00:58 ow oteeh ol i el Bile 10 
Lie Lk 0 eh. BRSSER AME SPARSE ABR SA ee neler eayches OOP GE Onan SOR a Oras oO} O] 06 1 
FOR Rte Re a a RE et igs o| o| of of of of of of of 1] 2 3 
At a mean temperature of 81° F. nymphs which dropped the last 
of May commenced. to molt in 29 days, a total effective temperature 
of 1,104° F. having been required. The molting period of nymphs 
which become males and females is about the same. It was found 
that when the engorged nymphs were placed in tubes on moist sand 
they at once burrowed. into it out of sight. When examined they 
were found an inch or more beneath the surface, in which position 
molting took place. This habit was not observed in engorged larve, 
but is probably the same. Although observations on this habit have 
not been made in other species of ticks, owing largely to the fact that 
it was necessary to keep them on an impenetrable surface in order 
that the exact dates of molting could be observed, it seems quite 
probable that some of them may do so also. Such a habit is of great 
advantage to the tick in protecting it from enemies during the 
quiescent period, as well as in preventing drying out. 
TasLeE XLVII.—Molting of engorged Ai of Amblyomma tuberculatum engorged 
on bovine. 
Temperature from 
Engorged nymphs molted—days following drop- | Number dropping to date 
Die. molted. | first tick molted. 
Date engorged 
nymphs Peele 
dropped. F 3 nesctolaaee Aver- 
. ||| Maxi-} Mini-| age 
29] 32] 36] 37| 38) 39] 44) 46] 48] 49] 51] 53) 66)203/207 3 E a mum. | mum. | daily 
siecle mean. 
i sa 0! 5a 4 
Apr. 23, 1908 1] 0} OF OF OF OF OF OF OF OF OF OF OS} OF OF 1) OF} YY 91.5 47| 76.29 
Apr. 24, 1908 Go} of of of 0} of o| of oiiad is|lua} of of of 21 4! 6} 30 47| 74.72 
Apr. 25, 1908 5} 0} O} O] OF OF OF} OFI29 BLS Oo; oO} Oo; OF} 1] 3) 4) ~~ «89 47| 74.73 
Apr. 26, 1908 21D) 0}. O}...0) .0)..0)* 10). 0}, OL 91 0) Seo Op Ote Ole iO) Did 91. 5) 47| 75.11 
ay 28, 1908 LO) OF OO “0! OF OF Ol Ol OF Oo) Olu Gr Lh 0; of 91.5 69] 80.50 
May 29, 1908 4} 0} of19] ol1g|t9l19] of of of of} of of} oO} of i] 3] 4} 91.5 69] 80.61 
May 30, 1908 311d} Cl Oj; O| 0] OF OF OF OF OF OF OF OF OF OF 1] OF 1 91.5 69] 81-05 
May 31, 1908 2 Ole O11 SILO ]..0}. O}- O} 0} OG} .0},..0), 70) (ORO). 0) AIF Bl, 2) 9 Sie 69} 81 
Nov.24, 1908 1] 0} OF OF OF OF OF OF} OF} OF OF OF} 6} OF} OG} OF 1) 1) 100 17) 67.15 
Dec. 2, 1908 1} 0} O} OF OF OF OF OF OF OF C] OF OF ODIs) OF 1) OF 1) 100 17| 67.89 
May 21, 1909 1119] O; O} OF OF OF OQ OF OF OF OF OF OF] OF C] OF 1] 1) 100 47| 86.17 
May 22, 1909 20), SL}, 10) 10), 20) GO Ole Ol. Clad GO}. Gl Ol OLS 2}. 1’ 100 47| 86.56 
Total..|  28)...|...|...|. al Pa 9| 14] 24 
