THE IGUANA TICK. 133 
At a mean temperature of 86.5° F. larve which engorged upon a 
tortoise molted as soon as the seventh day after dropping. How- 
ever, the greatest number molted on the eleventh day. At a mean 
temperature of about 83.5° F. larve engorged upon bovines required 
a minimum of 10 days from dropping to molting, the greatest num- 
ber molting on the twelfth day. Thus it appears that larve engorged 
on warm-blooded and cold-blooded animals have approximately the 
same molting period. A total effective temperature of at least 305° 
F. appears to be required for the molting of larve. 
TaBLE LI.— Molting of engorged larve of Amblyomma dissimile. 
| | 
| | Temperature from dr 
| | Engorged larve pore gale follow- | vine le date Sele iw 
Date ideas i a | Total | molted. 
engorged | = Host. | Num- | ; ——\ number 
a ber | [|| [motte bs 
7 | 9} 10} 11 | 12) 183 14 | 15 | 16 Max. | Min. daily 
| | | | | Mean. 
| ice Oy ate a oe ee Se So ee 
1908. | | | Fe ay oe er 
July 6| Bovine... 11] 0| of o| 2| 5| 1] 2] 0| of w| 94) za | 93.29 
tales © 7 he .do.... 24| 0} of 1] 5|13| 2] 1] 0} 0 22 94| 74 83. 45 
oy Ath aoe. | 35] O} 0] O; 8] 9] 7] 2] OF O 26 94) 74 83.7 
Salye, 49.15 db.. | 28] 0} Of. 01.0), 0] 2) 0),0] @ 21 95} 74 84. 09 
Aug. 2] Tortoise --| 6| 0] O| 0; 4] 2] O| 0} 0} O 6 9) 73 86. 37 
Aug. 3] Toad...... 8| 0] 0] 0] O| O| 7] 0} O 0 | 7 99| 73 86. 51 
Do....| Tortoise..| 3] 0| 0| o| 3| of o| of of o| 3 99 7 86. 41 
ees a eee } 12] 0} 2] 5] 3] 1] 0} Oj 0} O 11 9) 7 86. 14 
Aug. 6 |..-do. 4 iit | a a ae) 2) 8) Oy ay 8 17 | 99| 7 86. 59 
Aug. 7 |--.-do. | 2} O| O| Oo; 1] 1] O| O 4 0 2 | 99| 73 86. 94 
oe So 3/ 0] o| 1] 2] 0} O| 0} O| oO 3) | 7 86. 30 
Aug. .15 | Bovine...) 1| o| of of 0| o}| o| 1} 0} -0 i) =696| 75 84.32 
Rae 16 |. do | aT el) ot Oo) Oy. er Oo) ft) fie 21 96| 75.5| 84.17 
Aug. 17 |..-do...... 3) 0| 0} 0} O| 0} oO} 1) 2] 0 3} 96) 75.5] 83.90 
Due 18}. .do..--.. 3 0 | 0] 0] 0} O} oO} 0; 1] 1 2) 93| 75.5] 83.61 
Total. | fae. a2 | ae = Sel ina Al tweaks. we ieee idigagnaens nade 
1 Some specimens in this lot were destroyed before they molied. 
The nymph (Table LILT).—In order to determine the longevity of 
nymphs, five lots, each containing several specimens, were kept in 
tubes on moist sand in the laboratory. The longevity of these lots 
varied from 86 to 130 days. Those which molted J uly 20, 1907, were 
all dead by October 26, 1907, or 95 days after molting. One among 
those which molted August 13-15, 1907, lived between 124 and 130 
days; one of the lot which molted August 15-16, 1907, lived between 
104 and 111 days, and one of those which molted August 29 to Sep- 
tember 3, lived between 108 and 122 days. 
The shortest period in which they engorged on a bovine was 5 
days, the greatest number dropping on the sixth day. In August, 11 
days were required for engorgement upon a tortoise, the greatest 
number requiring 13 days. It appears from these two tests that 
nymphal engorgement is much more rapid on warm-blooded than on 
cold-blooded animals. 
