42 



Arachnida and Myriopoda 



on the integument of the nymph of this species, those on the front 

 part of the upper surface being spine-like. The adult is almost 

 smooth, however. Mexico and the south-western part of the 

 United States are the habitat of this species. Specimens have 

 been found in the ears of children on several occasions. Two 

 nymphs of this tick were extracted by Dr. J. Christian Simpson 

 from the ears of an American visitor to Cambridge, England. It is 



Fig. 18. 



The Spinose Ear Tick (Omithodoros megnini, Duges). 

 Nymph, enlarged. (After Marx.) 



supposed that they made their way into his ears when camping 

 out in Arizona. 



Omithodoros coriaceus, Koch. 



A species furnished with eyes and with the anterior margin of 

 the body rather cone-shaped in the middle. According to Banks it 

 occurs on cattle in California, and attacks the cattlemen, causing 

 large swellings which are very painful and remain for a week or 

 more. It is also found in Mexico and Paraguay. 



