CLASSIFICATION AND HABITS OF TICKS. 51 
In five lots of eggs deposited in April the incubation period varied 
from 37 to 43 days. Four lots deposited during May prior to the 10th 
hatched in 33 or 34 days. Seed ticks that hatched from eggs deposited 
May 10 lived until November 8 or 10, being alive November 6, but 
all were dead on November 10. The period of survival was thus six 
months from deposition. 
Under summer temperature Prof. H. A. Morgan found engorgement 
of the adult to take place in from 5 to 8 days. He concludes that the 
larve and nymphs attach to mammals other than cattle, as the species 
has only been found on cattle in the adult stage, and attempts to cause 
seed ticks to attach failed. 
NET TICK. 
(Dermacentor occidentalis Neumann.) 
This species (see Pl. IV, fig. 6) was received by Marx from Occi- 
dental, Cal. He determined it as a new species, labeling it D. occi- 
dentalis. Several writers have made use of this name, but it remained 
for Neumann to describe it for the first time in 1904, placing it as a 
variety of D. reticulatus Fab. Curtice in 1892 referred to it briefly as 
D. americanum (variabilis). It is now considered by Banks to be a 
distinct species and is the one referred to by Salmon and Stiles as 
reticulatus. The true D. reticulatus Fab. is not represented in our col- 
lections, although it may possibly be found to occur here when a 
thorough tick survey is made. 
The species seems to be a western one, being found in the region of 
the Rocky Mountains especially. The Bureau of Entomology and 
Marx collections contain specimens from California, Washington, 
British Columbia, Colorado, New Mexico, and Texas.. Salmon and 
Stiles also record specimens from Oklahoma and Tennessee. In a 
specimen taken from a deer skin at Kerrville, Tex., we have what is 
apparently this species, there being some doubt because of the poor 
condition of the individual. The recorded hosts include cattle, 
horse, sheep, deer, and man. 
ELK TICK. 
‘( Dermacentor albipictus Packard.) 
Dermacentor albipictus Packard, Am. Nat., II, p. 559; Guide to the Study of In- 
sects, 9th ed., p. 662. Not Ist Rept. Peabody Acad., p. 66. (See Banks, A Cata- 
logue of the Acarina or Mites, <Proc. U.S. Nat. Mus., Vol. XXXII, 1907, p. 608.) 
This species is found commonly on the wapiti or “elk’’ (Cariacus 
canadensis) in the States of Washington, Montana, Nebraska, Nevada, 
and New York. Salmon and Stiles report that game keepers on the 
reserve of the Blue Mountain Forest Association complain of its being 
very common on the wapiti and that it kills numbers of them. 
