Cooley & Kohls: Argasidae of N. America, etc. 107 



protrusile in the adult as in the nymph. Palpal article 1 long, about as long 

 as articles 2 and 3 combined. Article 4, conical. 



Hypostome. — Small, flattened, in the shape of an inverted V; denticles 

 not evident when examined in situ. Posthypostomal hairs placed far behind 

 the insertion of the hypostome and very long. Length from hairs to apex, about 

 0.18. (Described in situ.) 



Folds. — Coxal and supracoxal folds present. Coxal fold with a shining, 

 sclerotized plate bordering coxae II, III and IV. Suprocoxal fold similarly 

 sclerotized from opposite coxa III to the anterior end. There is also a similar 

 plate anterior to the sexual opening between coxae I. 



Grooves. — Preanal groove distinct at the sides but interrupted in the 

 middle. Transverse postanal groove deep and continous from the lateral mar- 

 gins. Median postanal groove deep and terminating at the transverse postanal 

 groove. Dorso-ventral groove absent. 



Sexual opening. — At the level of the intervals between coxae I and II. 



Eyes. — Absent. 



Anus. — In an elliptical pattern. 



NYMPH 



Body with shape much as in the adult. The late stage nymphs measure 

 3.0 x 1.95 and differ from the adult in possessing a definite sclerotized plate 

 posterior to the position of sexual opening and in lacking a transverse plate 

 between coxae I anterior to the sex opening. The late nymphs differ from the 

 adult also in having the mammillae in the margins of the transverse ventral 

 band only about as elevated as the other mammillae of this species and in 

 the first nymphal stage the band of modified mammillae is lacking. The 

 nymph lacks the definite modification of mammillae in the median posterior 

 margin of the dorsum as described in the adult. 



In the nymphs the capitulum is very long, protrusile, and attached by a 

 soft "neck." When so extended the capitulum reaches beyond the anterior 

 point of the body. 



Hypostome. — Pointed apically; the two posthypostomal hairs arising from 

 the tumescent base. The faint denticles scarcely visible even in mounted speci- 

 mens; those on the margins larger. Length about 0.15. 



Nymphs are misleading in appearing to have the sex opening present. This 

 is due to the presence of a sclerotized semi-circular flap and just posterior to 

 it a large, smooth sclerotized plate. Coxal folds have oval sclerotized plates 

 bordering on coxae II, III and IV, but the supracoxal folds are mammillated 

 and lack the long, definite sclerotized plates found in adults. 



LARVA 



Engorged larva (not necessarily fully fed) oval, widest in front of the 

 middle, bluntly pointed in front, rounded behind. Length (not including the 

 mouth parts) 2.64; width, 1.95. Larval integument striated as in other species 



