G-. H. F. Nutt all 
311 
underside of each, article 1 there arises a single long hair; hypostome 
club-shaped, 2|2, about 7 distinct teeth per outer file; basis capituli 
narrowing and constricted posteriorly, with rounded ventral ridge 
terminating laterally in rounded protrusions. Venter : Anal grooves 
distinct, as in the $; spiracle small, oval. Legs closely resembling 
those of the $. 
Larva (Fig. 13): Body broad when unfed. Resembles the nymph 
in certain respects. ( Dorsal aspect) Scutum: Broader than long, 
0-37 x 0-43 mm., with distinct cervical grooves diverging slightly and 
fading to the posterior border. Capitulum with short base, undulating 
dorsal ridge, slight cornua and distinct lateral spines. Palps with 
articles 2-3 short, club-shaped, of about equal length, article 1 as in the 
Fig. 13. Ixodes nuttalli Lahille 1913, larva (N. 2517). Scutum, capitulum in dorsal 
and ventral aspects, anus with anal grooves, coxae with trochanters, tarsus 3 
(G.H.F.N. del.). 
nymph when viewed dorsally but (in Ventral aspect) merely rounded 
posteriorly; hypostome and basis capituli as in the nymph. Venter: 
Anal grooves slightly divergent, attaining the posterior border. Legs: 
Coxa I with short postero-internal spur and one slight external spur, 
coxa II with slight postero-internal protuberance, coxa III unarmed; 
tarsi tapering gradually. 
My description is based on (N. 2513-2515, 2517) 1 S, 2 $, 3 o and 
many larvae both fed and unfed, found on Lagidium peruanum Meyer 
at Ninahuanchi, Peru, elevation 800 feet, by Dr C. H. T. Townsend, 
Director de Estaciones Entomologicas, Direction de Aguas y Agricultura, 
Lima, Peru. The adults and a nymph were taken on 1. n., two nymphs 
and many larvae on 11. in. and 1 larva on 14, v. 1913. Lahille’s 
20—2 
