Cooley & Kohls: Argasidae of N. America, etc. 37 



Genus Ornithodoros C. L. Koch, 1844 



18-44. Ornithodoros Koch, original description, p. 219. 



1845. Ornithodorus Koch: Erickson, in Agassiz Nom. Zool. (spelling emended). 



1877. Argas (Ornilhodoros) Murray, p. 183. 



1895. Rhynchoprium Marx, p. 199. Misprint for Rhynchoprion Hermann, 1804, a 

 synonym of Argas Latreille. 



1896. Ornilhodoros Koch: Neumann, redescribed, p. 25-26. 



1907. Alectorobins Pocock, original description, p. 189 (new genus proposed for O. 

 lalaje) . 



1908. Ornithodoros Koch: Nuttall ei a/., redescribed p. 39-40. 

 1911. Ornithodoros Koch: Neumann, redescribed, p. 122. 

 1932. Argas Latreille: Bedford, p. 280; in part. 



1934. Argas Latreille: Bedford, p. 60; in part. 



1936. Ornithodorus Koch: Brumpt, p. 1180 and p. 1192. 



Body more or less flattened but never marginated (except dyeri) and with 

 the pattern of integumental structures continuous over the sides from dorsal 

 to ventral surfaces. Sutural line separating dorsal and ventral surfaces absent. 

 Usually very convex on dorsal surface when distended. Dorsal humps and 

 subapical dorsal protuberances on legs progressively more prominent in the 

 successive nymphal stages. Capitulum either subterminal or distant from the 

 anterior margin. Hypostome well developed and usually essentially alike in 

 the sexes and in nymphs and adults. Integument with discs and mammillae com- 

 mingling in a variety of patterns. Hood, camerostome, and cheeks present or 

 absent. Eyes present or absent. 



Genotype: Argas savignyi Audouin, 1826, designated by Nuttall et al. 

 (1908) not O. coriaceus Koch designated by Oudemans (1936). 



Key to Species of Ornithodoros 



1 . Cheeks present, 4 dorsal humps on legs absent 2 



Cheeks absent, dorsal humps on legs present or absent 13 



2. Known only from bats and bat retreats 3 



Known only from animals other than bats or from animal nests and burrows, or 



from the open surface of the earth 11 



3. Hypostome more or less notched apically 6 



Hypostome not notched 4 



4. Hypostome with denticles very faint 5 



Hypostome with denticles distinct brodyi (p. 80) 



5. Hypostome long, attenuated azteci (p. 109) 



Hynostcme short, b-oad, ?nd pointed viguerasi (p. 106) 



6. Body unusually long in proportion to width and with two parallel ridges follow- 



ing the periphery Jljeri (p. 95) 



Body not unusually long and lacking two parallel ridges on the periphery 7 



7. Legs notably lone - - yumatensis (p. 74) 



Legs not notably long 8 



8. A small species with short legs (known from Panama) dunni (p. 103) 



Species of moderate size or larger and with legs of about the usual length 9 



9. Body oval, wider behind than in front - stageri (p. 91) 



Body with sides about parallel 10 



10. Larger species, and proportionately wider £e//e\>i (p. 113) 



4 One species, stageri, lacks the cheeks in nymphs and males. 



