THE GULF COAST TICK. 139 
TaBLeE LIV.—Engorgement of larvxe of Amblyomma maculatum. 
Larvee dropped engorged—days following application. , 
P % = Total 
Date sg ele Host. | number 
ie sree) Se) 6 te |e |g: hao: repped. 
1906. 
OG Seeds ae Dor. 5. 0 0 0 0 1 0 0 0 0 0 1 
1907 
BEDUseoeae cise cices = Bovine 0 0 1 65 23 9 1 0 0 0 99 
IA OE a eeeeeeeasel ae Gousces 0 0 0} Q) 29 if 3 0 0 0 39 
1908. 
INU Dil lctote’sie'siavsx:=/<| (= =:0 dove ea. 0 0 1 115 51 0 0 0 0 0 167 
ay Seseersees sscsal eer Gores. 0 0 0 3 14 2 0 0 0 0 19 
Mtiliye242 versace cece(se dokeaee 0 0 0 1 13 1 1 0 0 0 16 
PAI IAL Bo Sate aie dates | ETS dosege: 0 0 0 0 2 0 0 0 0 0 2 
1 Larvae which molted on this day were included with those which molted on the following day. 
At a mean temperature of 85.7° F. molting began as soon as 7 days. 
One of 7 larve which dropped November 4, 1908, molted 121 days 
later. The mean temperature during this period was about 60.8° F. 
An effective temperature of at least 299° F. is required for molting. 
The nymph (Table LV).—There are no records at hand on the 
longevity of the free nymph. 
Engorgement took place as soon as 5 days, 75 per cent dropping on’ 
the sixth and seventh days after attachment. The longest engorge-' 
ment period observed was 11 days. The tick upon which this record 
was made was collected on a meadowlark and placed upon a rabbit 
about a month later, when it readily attached. 
TaBLeE LV.—L£ngorgement of nymphs of Amblyomma maculatum. 
Nymphs dropped engorged—days following application. 
Total 
number 
1 Panltoah ie ele elena Ney ele ile @, Wit adlloeoboee 
Date nymphs 
applied. Host. 
Oct. 27, 1907..| Dog...... 0 0 0 0 0 0 2 0 0 Ol 2 
Oct. 29, 1907..| Bovine... 0 0 0 0 Selb ee 5 1 0 0 0 17 
Nov. 1, 1907. .| Dog...... 0 0 0 0 1 0 0 0 0 o|/20 1 
Aug. 11,1908..| Bovine... 0 0 0 0 0 3 0 0 0 On e0 3 
Mar. 27, 1909..| Rabbit... 0 0 0 0 0 0 0 0 @) | al 1 
The shortest molting period recorded for nymphs is 17 days. This 
record is based upon specimens which dropped August 17, 1908. The 
mean temperature was 84° F. and the total effective temperature 
694° F. during the period. There was considerable variation in the 
molting periods of ticks dropped in November which were kept under 
nearly the same conditions, the shortest period being 51 days and the 
longest 71 days. 
The adult (Tables LVI, LVI1).—Two-thirds of the 24 adults, the 
molting of which was observed by us, were females. The greatest 
