^Miscellaneous 



Symbiotes of the kennel tick have been noted by Cowdry (1923) 

 and Jaschke U933). See also l-tudrow (1932). 



Artificial feeding of this and other ticks by a capillary tube 

 arrangement in order to accomplish physiological and pathogen- 

 transmission studies was described by Chabaud (1950A). 



Whether host iimnunity is provoked by the feeding of this and 

 other ticks has been investigated by Briimpt and Chabaud (19A-7) 

 and Chabaud (1950B), who concluded that this phenomenon does not 

 occur when the kennel tick feeds on dogs. Guineapigs, however, 

 react with an almost complete immunity and rabbits with a partial 

 immunity (1950B). Infestation of guineapigs by R. s. sanguineus 

 does not protect the host against Dermacentor pictus . The kind 

 of host and kind of tick, as well as experimental methods, in- 

 fluence experiments of this natvire, and the earlier, classical 

 results of Trager (1939A,B,19A0) should not be generalized. 



IDEOTIFICATION 



Males , though extremely variable in many morphological char- 

 acters, retain a set of certain features that are constant and 

 differentiate them easily, (l) Posteromedian and paramedian 

 grooves are always present and distinct; and (2) no matter how 

 variable the general scutal punctations may be, four more or 

 less regular rows of widely spaced punctations, always larger 

 and most commonly somewhat deeper than all others on the scutum, 

 can be distinguished (when the specimen is turned obliquely to 

 the source of the light) extending from the level of the para- 

 median grooves to the level of the eyes. 



Males vary considerably in overall size, measuring from 

 1.7 mm. to Lr.K nim. long, or even more. Variation among most 

 characters, except interstitial punctation, usually can be asso- 

 ciated with size and robustness, though, imcomnonly, a large or 

 even enormous specimen is seen with weakly chitinized features 

 normally associated with otherwise poorly developed, runty spec- 

 imens. 



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