PARASITOLOGY. ie 
the head parts more prominent. The dorsal shield 
is large, somewhat elongated through the antero- 
posterior diameter, and is white in color. The hy- 
poscome is provided with six rows of denticles. The 
dorsa} surface of the male presents a large, white 
dorsal shield and silvery markings. 
DERMACENTOR RETICULATUS. 
Aistory—Found particularly in the Rocky Mour- 
tain region, 
Animal Infested —The ox. = 
Description.—The tick is about the size of the der- 
macentor electus. Its dorsal shield is large and a 
rusty white in color. The stigmal plate differs in shape 
from the D. electus as shown in the illustration. 
AMBLYOMMA AMERICANUM (Anerican). 
Synonym.—Lone Star tick; Amblyomma una- 
puncta. 
Distribution.—Southern United States and South 
America. 
Animal Infested.—The ox. 
Description.— About the same size 4s the preceding 
Jescribel tick. ‘he dorsal shield «s triangular in 
shape and reddish brown ; it is marked with a white 
spot in the posterior border. The head parts are 
more prominent than in the Bodphilus Annulatus. 
The hypostome is furnished with six rows of denti- 
cles. 
LINGUATULIDA. 
This order includes a group of degraded Acari, 
‘he most common of which is the 
LINGUATULS RHINARIA (Lingua—tongue). 
Synonyms.—Pentastoma Taenoides; Linguatula 
