THE GULF COAST TICK. 185 
beneath the carapace midway between the head and the left fore leg. 
Newstead reports 3 females to have engorged on a toad in 14, 17, and 
23 days, respectively. 
LIFE CYCLE. 
Larvee may live 95 days in summer and fall; they engorge as soon 
as 4 days and in summer may molt as soon as 7 days, at least 305° F. 
of effective temperature being required. Nymphs may live as long 
as 130 days during summer and fall; they engorge as soon as 5 days 
after attaching to a host, and may molt in 12 days after dropping, 
479° F. of effective temperature being required. Among the indi- 
viduals which we have observed to molt from nymphs, there was a 
predominance of females. Adults may live 129 days; they may 
engorge in 14 days, commence ovipositing 6 days later, and deposit 
as many as 1,784 eggs. In summer eggs may hatch in 27 days, 
1,133° F. of effective temperature being required. The longevity of 
all stages of this tick appears to be shorter than any of the Amblyom- 
mas studied by us with the possible exception of A. tuberculatum. 
ECONOMIC IMPORTANCE. 
So far as is now known this tick is of no economic importance. 
However, a better knowledge of the host relations of the species may 
show it to be of some importance. 
NATURAL CONTROL. 
No natural enemies of this tick have been found by us. 
THE GULF COAST TICK. 
Amblyomma maculatum Koch. 
DESCRIPTIVE. 
The common name of this species is given because of the prevalence 
of the tick along the Gulf coast. 
Adult (Pl. X, figs. 8-10).—Males from 4 by 2.25 mm. to 6 by 
3mm. Females, unengorged, 4 by 2.25 mm. to 5 by 2.33 mm.; 
engorged, from 14 by 10 by 7 mm. to 18 by 13 by 8 mm. Males 
dark brown, scutum brown, lineate with silvery white, lines more or 
less connected. Unengorged females dark brown, scutum silvery 
white behind, brown in front, with one median and two lateral inter- 
rupted stripes. Engorged females leaden gray. 
Nymph (Pl. X, fig. 7).—Unengorged, about 1.33 by 0.75 mm.; 
engorged, about 4.5 by 3 by 2mm. Dark bluish gray, shining; some 
of the engorged nymphs are dull white, due to the ingestion of lymph. 
Capitulum 0.392 mm. long (from tip of palpi to base of emargination 
of scutum); scutum 0.617 mm. long by 0.598 mm. wide. 
Larva (Pl. X, fig. 6).—Unengorged, 0.617 by 0.402 mm. to 0.631 
by 0.416 mm.; engorged, 1.5 to 1.66 mm. long by 1 mm. wide. 
