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ILLUSTRATIONS. 
PLATES. 
The North American fever tick. Fig. 1.—Eggs of the tick, Marga- 
ropus annulatus, deposited under stable litter. Fig. 2.—Seed 
ticks of Margaropus bunched on grass and stake.......--------.- 
The North American fever tick. Fig. 1.—Steer used in experimental 
work. Fig. 2.—Arrangement for obtaining data on incubation. .- 
The North American fever tick and other species. Fig. 1.—Marga- 
ropus annulatus, male. Fig. 2.—Hxemaphysalis leporis-palustris, 
female. Fig. 3.—Stigmal plate of Margaropus annulatus, male. 
Fig. 4.—Mouth parts of Ixodes cookei. Fig. 5.—Stigmal plate 
of Rhipicephalus sp., male. Fig. 6.—Stigmal plate of Amblyomma 
LOCLULCL LOD RENIN Al Coates Nip yep! We eee) tie So mae WE Tt sep a cle 
Stigmal plates of ticks. Fig. 1.—Stigmal plates and anus of Derma- 
centor nitens, male. Fig. 2.—Stigmal plate ofsame. Fig. 3.—Stig- 
mal plate of Amblyomma cajennense, male. Fig. 4.—Same, female. 
Fig. 5.—Stigmal plate of Dermacentor variabilis, female. Fig. 
6.—Stigmal plate of Dermacentor occidentalis. .......-.------------ 
TEXT FIGURES. 
Margaropus microplus: Genital apparatus..........-.----------------- 
. Graphic table for the separation of the families and genera of ticks -- - - 
REnemeephatus spe Capitulum ob fenmile}: 227-2)... 5252-2 - s22s- 
. Rhipicephalus sp.: Coxe of male and female ..........-.-.----------- 
. Dermacentor mitens: Capitulum. of female.....-.+.--.....--------+--- : 
Dermacentor ‘nitens: Coxe of male and female..................------ 
. Hxemaphysalis leporis-palustris: Capitulum and scutum of female. ...-- 
. Hxmaphysalis leporis-palustris: Coxe of male and female .....-.------ 
. Amblyomma cajennense: Mouth parts of male......--..--------------- 
. Amblyomma cajennense: Coxee of male and female..........----------- 
. Amblyomma maculatum: Mouth parts of female.....-.-.--.----------- 
. Amblyomma maculatum: Coxe of male and female.....----------.----- 
. Amblyomma maculatum: Scutum of female......---------------------- 
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