G. H. F. Nutt all 
319 
trochanter with dorsal spur. Capitulum : Base short, broad, with 
slight rounded cornua continuous with the trenchant dorsal ridge; 
porose areas deep, somewhat angular or rounded, with interval slightly 
less than their length. Palps of medium length, with article 2 twice as 
long as 3, article 1 large and massive, projecting forward internally and 
with protruding angles both dorsally and ventrally; (Ventral aspect) 
hypostome with moderately pointed teeth, 2|2, except distally where 
they are 3[3, there being 12-14 teeth per outer file with a short median 
unarmed ridge; basis capituli constricted near palps, posteriorly 
almost quadrangular, somewhat hollowed in the middle. Venter: 
Vulva facing second intercoxal spaces; anal grooves not joining in 
front but forming two crescentic lines converging in front and behind 
the anus; spiracles long ovoid, with long axis transverse, the tapering 
Fig. 19. Ixodes anatis Chilton 1904, nymph (co-type). Scutum with part of leg I, 
capitulum in dorsal and ventral aspects, anus with anal grooves, coxae with tro¬ 
chanters, spiracle, tarsus 4 (G.H.F.N. del.). 
» 
end directed dorsally. Legs with all coxae trenchant, coxa I only 
bearing a stout postero-external spur with rounded tip; trochanters 
armed with similar spurs; tarsus 4 short, humped distally where it 
tapers abruptly; pad short. A fully gorged specimen measured 
10 x 7 mm. 
Nymph (Fig. 19): The nymph bears a general resemblance to 
the ?. Scutum shaped as in the $, cervical grooves practically 
obsolete, the posterior half bears fine hairs. Capitulum base very 
short with antero-lateral borders forming an acute angle with the dorsal 
ridge which is almost straight; palps relatively more slender and with 
article 1 smaller than in the $; hypostome 2j2, with 10 distinct teeth 
per outer file. Venter as in the $ but the spiracle less elongate. Legs 
as in the $ but tarsi not humped distally where they taper. 
