Cooley & Kohls: Argasidae of N. America, etc. 103 



The type specimens came from "Nova Granada. 1 ' Brumpt's specimens of 

 venezuelensis were collected in Colombia and Venezuela; those of migonei 

 were from Paraguay. 



We have seen living specimens of O. migonei which came originally from 

 Paraguay, and the Rocky Mountain Laboratory also has preserved specimens 

 from Paraguay sent by Dr. Brumpt. These materials have supplied an abun- 

 dance of specimens of all stages which have been compared with living and 

 preserved specimens of O. rudis Karsch. The comparison shows no specific 

 differences in adults, nymphs, or larvae and we find it necessary to make 

 migonei a synonym of rudis, which has priority. 



Dunn (1927) considers "this tick (O. venezuelensis) to be the one com- 

 monly found in houses in various parts of Panama, Colombia, and Venezuela, 

 and possibly in some of the neighboring republics, and that this species accepts 

 man as its preferred host." In 1921 he received specimens from the native vil- 

 lages of Chorrera and San Juan in the Republic of Panama. In 1924, a total 

 of 4,880 specimens was collected in Colombia from 68 houses in 20 villages, 

 towns, and cities in various parts of the republic. 



We have seen specimens from Panama, Canal Zone, Department of 

 Boyaca in Colombia, and Venezuela, as well as from Paraguay. 



Ornithodoros dunni Matheson, 1935 

 Plate 11, Fig. 47 



1935. Ornithodorus dunni Matheson, original description, pp. 347-349, with figures. 

 Sexes similar; adults and nymphs similar. 



ADULT 



Body. — Oval, a little pointed in front, wider and rounded behind; much 

 flattened. Hood and mouth parts not visible from above. Matheson (1935) 

 gives as the length 3.4; extreme width, 2.0. A single male before us measures 

 2.79 x 1.71. 



Mammillae. — Relatively few in number, those in the margins smaller. It 

 is difficult to distinguish 'between the mammillae and discs in the posterior 

 areas near the margin on both dorsal and ventral surfaces. The individual 

 mammillae are smooth and shining, only a little elevated and convex on top, 

 usually with one or more small pits. Inconspicuous short hairs visible on the 

 hood and around the entire margin on both dorsal and ventral surfaces. 



Discs. — Large and conspicuous as elevated, shining areas which occupy 

 much of the dorsal surface; a few are present also on the ventral surface, where 

 they are in lineal arrangement in the grooves. 



Legs. — Short and heavy with numerous short hairs. Length of male tarsus 



