454 



BUREAU OF ANIMAL INDUSTRY. 



D. reticulata. Hypostome similar to that of />. reticulatuf^, with three rows of den- 

 ticles on each half. Palpi slightly longer than hypostome, at least twice as long as 



broad, not extending laterally 

 of base of capitulum; second 

 article longer than broad, dor- 

 sal retrograde projection small; 

 third article slightly broader 

 than long, its apex rounded; 

 second and third articles pro- 

 vided with hairs, especially 

 ventrally. Legs relatively long, 

 all articles with hairs. Coxse 

 approximated (in young speci- 

 mens); coxae I bidentate, the 

 lateral division forming a spine; 

 coxse II to IV with small acute 

 spine near postero-lateral angle, 

 and a flat tubercle at postero- 

 median angle; trochanters I 

 with broad dorsal retrograde 

 spine; tarsi with tubercles on 

 ventral border; all legs with 

 terminal spur; pulvillum 

 reaches nearly to recurved por- 

 tion of claws. 



Fig. 189. — Scutum of female of Dennaccntor electus. 



enlarged. Original. 



Greatly 



This species is abundant 

 on the wapiti {Cariacus 

 canadensis)\ it has been collected in Washington (State), Nebraska, 

 Nevada, and New York (Adirondacks). Complaints have been made 

 to this Bureau that it is exceedingly common on wapiti in the reserve 

 of the Blue Mountain Forest Association, and according to reports 

 from the gamekeepers it kills numbers of 

 the deer. Whether the wapiti really die 

 from the direct effects of the bite of these 

 ticks (as seems improbable), from its indi- 

 rect effects by the transmission of some 

 disease, from liver fluke disease caused by 

 FaHciola magna^ or from some other cause 

 has not, in our opinion, been established. 



D. variegatus is not yet recorded for 

 steers, but there can be little doubt re- 

 garding the likelihood of its attacking 

 cattle. 



There is a question in our minds whether 

 I), variegatus is really specifically distinct from D. reticulatus. Neu- 

 mann admits that good anatomical differences are lacking, and that 

 it may perhaps be simply a variety of D. reticulatus. 



Fig. 190.— Stigmen of same. Greatly- 

 enlarged, Original. 



