PARASITOLOGY. 69 
THE TICKS. 
ARGASIDAE. 
The family Argasidae includes the ticks. They are 
provided with flat, oval bodies. The piercing man- 
dibles and hypostome are located beneath an over- 
reaching cephalo-thorax, or anterior part of the dorsal 
Fig. 25—ArGAs MINIATUS, LaRva. 
a, Mandibles and Palpi. b, Legs. 
c, Body. 
surface. The dorsal shield is absent. The life his- 
tory is similar to that of the common ticks. 
ARGAS MINIATUS. 
Synonyms.—Argas Americanus; Chicken tick. 
fTistory.—Found in Mexico and the Southern part 
of the United States. 
Description.—The parasite is flat like a bedbug, 
and ovoid in shape. It is provided with an over- 
reaching dorsal surface, the top of which is pitted. 
The head parts consist of two mandibles provided 
with teeth at the terminal end. Beneath these is a 
