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



47 



Folds. — Coxal and supracoxal folds present. 



Grooves. — Dorso-ventral groove present but faint. Preanal groove pro- 

 nounced, sinuous; transverse postanal groove pronounced, interrupted at the 

 median postanal groove which is deep and reaches from near the anus to near 

 the posterior border. 



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



Eyes. — Absent. 



Anus. — In a long, oval pattern. 



LARVA 



Oval, broader behind; mouth parts short and capitulum visible from above. 

 Integument thin and striated; hairs in a symmetrical pattern on dorsal and 

 ventral surfaces. 



Hypostome. — Sides nearly parallel, apically truncated or slightly notched; 

 denticles 2 / 2 with about four large ones in each file and occupying about two- 

 fifths of the distal portion. Posthypostomal hairs about three-fifths the length 

 of the hypostome and arising from a prominent swelling. Length, about 0.08. 



HOSTS 



It has been assumed that O. hermsi bites man because of the known cases 

 of relapsing fever originating from mountain cabins in wh ; ch this species has 

 collected. Until recently there have been no published, definite records of the 

 hosts of this tick, but the account of Philip and Davis (1940) gives records 

 of this tick biting man. 



D 



Fig. 17. Orniihodoros hermsi Wheeler. Herms and Meyer. A, Hypostome of adult. 

 B. Leg I of adult. C, Leg IV of adult. D, Capitulum of larva, ventral view. 



