THE GULF COAST TICK. 139 
TaBLE LIV.—Engorgement of larvx of Amblyomma maculatum. 
Larve dropped engorged—days following application. 
= SSeS ee eee 
Date ome ap- Host. | number 
Cie a | eo 6) 6 Le | eb 8 ton eee 
1906. 
CYC Se ee aioe BG ee cae ae 0 0 0 0 1 0 0 9) 0 0 1 
190 
Ube oases heidisians Bovine 0 0 1 65 23 1 0 0 0 99 
(QV? UUs Ge eee Owns sts 0 0 @ | °@) 29 7 3 0 0 0 39 
1908. 
LNs S27 Ge ae eee do 2ass< 0 0 ye ee Ia 51 0 0 0 0 0 167 
MUR Gun Ata nie ec, cie coe 2 Ow ee =e 0 0 0 3 14 2 0 0 0 | 0 19 
‘it 172 a eer ea GO che 0 0 0 J 13 if J 0 0 | 0 16 
BREEN ES. os odid.acoes spre Gow. 0 0 0 0 2 0 0 0 | 0 0 Z 
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 larvee 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. 
TABLE LV.—Engorgement of nymphs of Amblyomma maculatum. 
Nymphs dropped engorged—days following application. 
a CAL a SoS hho ee Total 
aeieat 4 Host. number 
die we ee ow eee ge hg) ge | ag [gy fEOpDEs 
| 
———E4 ee eee 4 = 
Oct. 27, 1907..| Dog...... a fines ol 68) of. a| of of. of -e 2 
ole, 1007-.) Bovine...|/ 0] 0). 6) oF 38) o8|--5 1 ate 5 aoe 17 
Nov. 1, 1907..| Dog...... CP ow at wld pole?  Gt.. Ol) Ae 1 
Aug. 11,1908..)} Bovine... 0 0 0 0 0 3 | 0 0 0 0 0 3 
Mar. 27,1909.) Rabbit...|. 0| of; O|, O| Oo} oO} of}; o| oj. oO | 2 i 
| 
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, LVII).—Two-thirds of the 24 adults, the 
molting of which was observed by us, were females. The greatest 
