Cooley & Kohls: Argasidae of N. America, etc. 



those of the adult. The entire surface, shining and with fine reticulations or 

 striae which are continuous over depressed areas which are the counterpart of 

 discs. These disc areas lack spines. 



Spines. — Spines conspicuous, of two kinds (see figures 7 and 8, B) ; those 

 with heavier bases confined to an anterior dorsal crescentic area which extends 

 over the sides and backward to a short distance in front of the spiracle and is 

 continuous with the anterior ventral area which reaches posteriorly about to 

 the anus; the more slender spines occupy the posterior dorsal, lateral and ven- 

 tral areas not detailed above. The line of demarcation between the two kinds 

 of spines is definite. Spines absent in the area surrounding the capitulum. 



Legs. — Short and heavy. Tarsi II, III, and IV with the subapical dorsal 

 protuberance absent or very small; absent on I. Length of tarsus I, 0.48; meta- 

 tarsus, 0.42. Length of tarsus IV, 0.6; metatarsus, 0.6. Hairs on the legs a 

 little longer than those on the legs of the adults. 



Coxae. — Indefinite; trochanters of the legs arise from a circular opening in 

 the body wall which is modified only by a short, V-shaped sclerite in the usual 

 position of the coxa. 



Spiracle. — Conical. 



Folds and Grooves. — Coxal and supracoxal folds are faint or absent in the 

 nymphs. True grooves are absent. 



Capitulum. — Subrectangular, about as broad as long, ventrally tumescent; 

 surface smooth and shining; a few hairs at the sides in front, and with a group 

 of short, heavy spines on each side behind. 



Hood and Camerostome. — Absent. 



Hypostome. — Large, tapering, and with long, sharp denticles arranged 4 4, 

 with about 8 in each file. Denticles about as large and prominent in basal as 

 in apical portion, with no fine denticles in the corona. Posthypostomal hairs 

 absent. Length about 0.36. 



FIRST NYMPH 



The first nymphal stage is very much like the newly emerged second stage, 

 but is smaller, has more slender legs and the hypostome measures only 0.195. 

 Posthypostomal hairs absent. (See also Brumpt [1936] p. 648). 



LARVA 



Unfed larva measures 0.66 from tip of hypostome to posterior extremity. 

 Body oval; two pairs of hemispherical, ocellus-like eyes present. Integument 

 thin, striated, and with a few bristle-like hairs arranged symmetrically. Capitu- 

 lum visible in both dorsal and ventral views; hypostome and palpi very long. 

 Hypostome with the denticles arranged -/■_>. Palpi with articles 2 and 3 about 

 equal and with 1 and 4 short. Legs long; stalk of pulvillus long; pulvillus 



