152 LIFE HISTORY OF NORTH AMERICAN TICKS. 
Egg.—Ellipsoidal, deep yellowish brown, shining, smooth. The 
average size of 10 eggs measured was 0.487 by 0.431 mm. 
HOST RELATIONSHIP. 
The type host of this tick is not known. It attaches readily to a 
large number of mammals, having been taken in Texas by agents of 
the bureau from the horse, mule, ox, goat, coyote, peccary, and man. 
Other hosts recorded are dog, hog, capybara, anteater, and toad. 
Mr. A. H. Jennings has collected this tick in Panama on the dog, 
horse, ox, and deer (Qdocoileus toltecus). Mr. D. K. McMillan 
obtained one partially engorged female from a Mexican lion ( Felis 
hippolestes aztectus) at Raymondville, Tex. On November 20, 1907, 
a flock of 75 goats in the vicinity of Brownsville, Tex., was examined 
for ticks. Larve of this species were found in large numbers on the 
ears and over the eyes of all examined, while partially engorged 
nymphs were occasionally found. Adults were collected in this same 
locality, associated with Dermacentor nitens in the ears of horses. 
However, they appear to prefer the abdomen or between the legs as 
places of attachment. On April 22, 1908, Mr. H. P. Wood found 
horses and mules at Brownsville to be badly infested by this tick. 
Messrs. E. A. Schwarz and F. C. Bishopp found this species to be 
very annoying to man in the vicinity of Tampico, Mexico. Horses 
appeared to be the host most commonly attacked by the adults. 
Newstead observed this tick in Jamaica to occur more particularly 
on equines and less abundantly on cattle. This has been the same 
in our observations. Newstead states that there are authentic 
records of the occurrence of this tick on the tongues of young calves. 
As illustrating what a great pest this tick is to man, he states that 27 
adults of both sexes and swarms of larve were taken from his body 
after passing through a small native settlement in Jamaica. Stoll 
(1886-1893) has described a similar habit in the tick in Mexico and 
Central America. 
GEOGRAPHICAL DISTRIBUTION. 
(Fig. 12.) 
The type locality of this species is Guiana. It has been collected 
at several points in southern Texas by agents of the Bureau of Ento- 
mology, being particularly abundant at Brownsville. The Marx 
collection contains an unengorged female labeled as collected at Bis- 
cayne Bay, Fla. It seems quite probable that records of this species 
from Arizona are based upon a jar of ticks which are incorrectly 
labeled. Banks records having seen specimens from San Diego 
County, Cal. This is, with the possible exception of Margaropus 
annulatus australis, the most common species in Mexico and Central 
America. It has been reported from Mexico, Guatemala, Honduras, 
Nicaragua, Costa Rica, Panama, Bermuda, Cuba, Jamaica, Trinidad, 
Colombia, Venezuela, French Guiana, Brazil, Paraguay, and Argentina. 
