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



115 



Hypostome. — Short and small, sides subparallel, a little wider at the denti- 

 cles than at the middle; apically notched. Denticles 2 / 2 with about 4 in each 

 file. Corona with many very fine denticles. Length of female hypostome, 0.21. 



Folds. — Coxal and supracoxal folds present, the latter extending forward 

 to near the hood. 



Grooves. — Preanal, transverse postanal, and median postanal grooves pres- 

 ent, the last terminating at the transverse postanal groove. Dorso-ventral 

 groove absent. 



Sexual opening. — Between the posterior ends of coxae I. 



Eyes. — Absent. 



Anus. — In an oval frame. 



LARVA 



Unfed larva sub-oval in shape. Length of body including capitulum, 0.96; 

 length of capitulum (in ventral view), 0.42. Palpi very long, slender, and in 

 life closely appressed on the mouth parts. 



Hypostome. — Long and slender and with a basal portion without denticles 

 about one-third as long as the apical portion with denticles; sides converging 

 to the pointed apex. Principal denticles 2 / 2 , extending the full length; apically 

 3 / 3 ; lateral denticles much larger and sharper. Length about 0.195 (measured 

 from beginning of the basal teeth to the apex) . 



O. kelleyi is related to talaje and concanensis. Nymphs and adults of 

 kelleyi may be separated from talaje by the absence of a definite notch just 

 above the hood, visible when viewed in lateral profile. The unfed larvae of 

 talaje are only about two-thirds as long as those of kelleyi. From concanensis 



Fig. 52. Distribution of Ornithodoros fyelleyi Cooley and Kohls. 



