LUSTRATIONS. 
PLATES. 
•age. 
Plate I. 'Flic North American Eever tick. Fig. I. Eggs of the tick, Marga- 
ropus annulatus, deposited under Btable litter. Fig. 2. ^cc>\ 
ticks of Margaropus bunched od grass and stake 10 
1 1 . The North A tnerican Fever tick. Fig. I . Steer used in experimental 
work. Fig. 2. Arrangement for obtaining data on incubation... 1G 
III. The North American fever lick and other species. Fig. 1.- Marga- 
ropus annulatus, nude. Fig. 2. — Hsemaphy sails leporis-palustris, 
female. Fig. 3. — Stigmal plate of Margaropus annuJalu.s, male. 
Fig. -1.- Mouth parts of Ixodes coohei. Fig. 5. — Stigmal plate 
of Ehipicephalus sp., male. Fig. 6. — Stigmal plate of Amblyomma 
maculatum, female 48 
IV. Stigmal plates of ticks. Fig. 1. — Stigmal plates and anus of Derma- 
centornitens, male. Fig. 2. — Stigmal plate of same. 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 I>> rmacentor occidentalis 48 
TEXT FIGURES. 
Fiq. 1. Margaropus microplus: Genital apparatus 14 
L'. Graphic table for the separation of the families and genera of ticks .... 41 
3. Rhipicephalus sp.: Capitulum of female 47 
1. Rhipict phalus sp.: < Joxse of male and female 48 
5. Dermaci ntor nil, ns: < lapitulum of female 52 
(i. Dermaci ntor nitens: Coxae of male and female 52 
7. Hasmaphysalis leporis-palustris: Capitulum and scutum of female 53 
s. Exmaphysalis leporis-palustris: Coxae of male and female 53 
9. Amblyomma cajt nm us, .- Mouth parts of male GO 
lo. Amblyomma cajennense: Coxae of male and female Gl 
1 I . Ainbh/oiiiiiia niacnlaliiiii: Mouth parts of female G2 
L2. Amblyomma maculatum: Coxae of male and female 63 
13. . I mblyomma maculatum: Scut um of female G3 
7 
