88 American Midland Naturalist Monograph No. 1 



The rodents concerned were Dipodomys sp., Citellns sp., and Neotoma sp., 

 including N. albigida and N. floridana baileyi. While reported from houses 

 in Minnesota (Riley, 1935), Wisconsin (Herrick, 1935), and New York 

 (Matheson, 1931) the species actually concerned was O. kelleyi Cooley and 

 Kohls 1941. 



In Mexico, Hoffman (1930) stated that the natural hosts are small, wild 

 rodents and probably other mammals which inhabit holes and subterranean 

 nests, and doubtless with the intervention of rats it is found in the houses 

 of man, whom it attacks with preference when once established in the habita- 

 tion. As a true domestic parasite it has been observed only in the south of the 

 Republic and never north of the region of San Andres Tuxtla. In the northern 

 part of the State of Vera Cruz and in Tamaulipas it is quite rare and is found 

 almost exclusively on wild animals (rodents). He stated that the bites were 

 painful but not to the extent of those by O. turicata. 



Among the hosts in Panama listed by Dunn (1933) were Mus alexan- 

 drmus, M. norvegicus, M. rattus, several species of monkeys, dogs, cats, 

 chickens, and a snake, Epicrates cenchris. The ticks found were principally 

 larvae. Dunn stated that adults were seldom observed in dwellings and he 

 believed that they rarely attacked man. 



Ornithodoros concanensis Cooley and Kohls, 1941 

 Plate 8, Fig. 40 



1941 (c). Ornithodoros concanensis Cooley and Kohls, original description, pp. 910-911, 

 with figures. 



Sexes similar; nymphs and adults similar. 



ADULTS 



Body. — Sub-oval, sides nearly parallel, anterior margin bluntly pointed, 

 posterior margin rounded. Marginal projection opposite coxa II moderate. 

 Size of female, 5.5 x 3.0; male, 4.20 x 2.40. 



Mammillae. — Large, close but not crowded; sides and tops with a mixed 

 pattern of ridges with but little appearance of radiation; the majority have one 

 or two circular or crescentic pits on top, with a short, indistinct hair present 

 in some of the pits especially in the peripheral areas. Sizes about equal in 

 lateral and median areas of dorsum, slightly larger on posterior margin; on the 

 venter somewhat smaller than those on the dorsum, but larger on the posterior 

 margin; absent on supracoxal folds. 



Discs. — Those on the dorsum depressed and with edges elevated. Venter 

 with the discs in lineal arrangement in the preanal and median postanal 

 grooves; present also in three depressions caudad of the transverse postanal 

 groove. 



