T. angusttis 



197 



Nymph 1 (Fig. 189): differs remarkably from the % in several 

 respects. Scutum as broad or broader than long, with lateral angles, and 

 with lateral grooves not attaining the posterior border. Capitulum : 

 base with pointed cornua, and large, laterally projecting auriculae ; 

 palpal article 1 projecting forward and inward in a long pointed process. 

 Legs : coxae resembling those of adults ; tarsi short, slightly humped 

 distally, where they taper abruptly. 



Larva 1 (Fig. 190): resembles the o to some extent. Scutum broad, 

 without lateral grooves, the cervical grooves attaining the posterior 

 border ; emargination very slight. Capitulum : base devoid of cornua 

 and auriculae ; palpal article 1 projecting forward as in the O, but also 

 outward and backward ventrally. 



Fig. 189. Fig. 190. 



Fig. 189. I. angustws o : capitulum and scutum ; capitulum in ventral aspect with 



coxae, tarsus 4, anal groove and spiracle. Drawn from specimens (N. 1134) found on 



squirrels, Mt Lehman, British Columbia, Canada, 1910 ; S. Hadwen coll. (Original, 



G. H. F. N. del.) 

 Fig. 190. I. anijustus larva : dorsum and venter, tarsus 3. Same origin as the nymph 



in Fig. 189. (N. 1134. Original, G. H. F. N. del.) 



Described from 1 J 1 (N. 1065) from Sciurus hudsonius douglasi, 

 Mt. Lehman, British Columbia, Canada (S. Hadwen coll., III. 1910), and 

 several ? s found on the same host and in the same locality (T. Bowhill, 

 xii. 1908, and S. Hadwen, xn. 1909 and ix. 1910, N. 506, 991, etc.). 

 Mr S. Hadwen has sent us (N. 1195) a </ and ? which copulated in 

 confinement, the £ having been taken on Lepus dalli and the % on the 



1 Were it not for the kindness of S. Hadwen, D.V.Sci., who has raised this tick 

 through the various stages and sent us the specimens he has raised, we should not have 

 been in a position to associate the nymphal and larval form with the adults. It is true 

 that Dr Hadwen had found the immature forms on the same hosts with the adults, but 

 they differ so much from the latter that we could not refer them to angttstus on the 

 strength of their structure. 



