84 American Midland Naturalist Monograph No. 1 



wrinkles and micromammillae. Palpi moderate in size; article 1 micromam- 

 millated. 



Hypostome. — Short and small, sides nearly parallel, notched apically. 

 Denticles arranged 2 / 2 with about four large ones in each file, and with those 

 in the median and lateral files about equal in size. Length about 0.245. 



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

 tc near the hood. 



Grooves. — Dorso-ventral groove absent. Preanal, transverse postanal, and 

 median postanal grooves present, the latter terminating at the transverse post- 

 anal groove. 



Sexual opening. — Between coxae I. 



Eyes. — Absent. 



Anus. — In an oval frame. 



LARVA 



Unfed larva sub-oval in shape; basis capituli triangular in dorsal view. 



Palpi very long, slender, and in life appressed against the hypostome. Length 



of body, including capitulum, 0.66. Length of capitulum (in ventral view), 

 0.33. 



Hypostome. — Very long and slender; denticles in a 2 / L > arrangement with 

 the marginal denticles much larger than those in the next file which are not 

 easily seen, even when mounted in balsam. Length about 0.21. 



O. talaje is rather closely related to O. k e H?yi and O. concanensis, two 

 bat-infesting species. From kelleyi it may be distinguished in the adult and 

 late nymphal stages by a notch just above the hood when viewed in lateral 

 profile. In these stages, concanensis is smaller, proportionately longer, more 

 rounded on the posterior margin, the marginal projection opposite coxa II less 

 pronounced, the hood shorter, and the depressed areas occupied by the discs 

 less extensive. The larvae of concanensis are unknown. The larvae of talaje 

 have the hypostome broad, with sides rounded, while in kelleyi the 

 hypostome is long and narrow and the sides are nearly straight. Further, in 

 talaje the base of the hypostome (from the insertion of the palpi to the denti- 

 cles) is shorter than in kelleyi. 



DISTRIBUTION 



The range of O. talaje extends from California and Kansas to Argentina. 

 The types were from Guatemala. 



In the United States it is known from California, Arizona, Nevada, 

 Kansas, Texas, and Florida. Hoffman (1930) stated that in Mexico this tick 

 is a native of the hot country and that it is found on the Peninsula of Yuca- 

 tan, Campeche, Tabasco, Chiapas, the Isthmus and State of Vera Cruz, 

 extending along the Gulf Coast toward Texas; on the Pacific Coast the species 



