PLATE 4a. 
1—Boophilus Annulatus. a-Ventral view, 
b-Dorsal view. 
2—Amblyomma Americanum, 
view, b-Ventral view. 
3—Ornithodoros Megnini, a-Ventral view, 
b-Dorsal view. 
a-Dorsal 
PLATE 4b. 
4—Argas Miniatus, a-Dorsal view, b-Ven- 
tral view. 
5—Dermacentor Electus. 
6—Boophilus Annulatus, male. 
7—Ornithodoros Megnini, Section of skin 
showing spines. 
8—Leg, Boophilus Annulatus. 
PLATE 5. 
1—Stigmen, Boophilus Annulatus larvae. 
Drawing from moult. 
2—Leg, Boophilus Australis, Side view. 
3—Leg, Ornithodoros Megnini. 
4—Stigmen, Boophilus Annulatus. 
5—Stigmen, Dermacentor Reticulatus. 
6—Capitulum, Boophilus Annulatus. 
PLATE 6. 
1—Amblyomma Americanum, ovipositing. 
2—Boophilus Annulatus, ovipositing. 
3—Boophilus Annulatus on skin of cow. 
4—Sarcoptic scabies, cat. 
PLATE 7. 
1—Spiroptera Strongylina, a-male, b-fe- 
male. 
2—Spiroptera Strongylina, cephalic ex- 
tremity. 
8—Spiroptera Strongylina, caudal extrem- 
ity of male. 
4—Spiroptera Strongylina, caudai extrem- 
ity of female. 
5—Ascaris Mystax. 
6—Oxyuris mastigodes, female. 
7—Ascaris Suis, front view of cephalic 
extremity. 
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