CHIGGERS — FARRELL 209 



British Columbia 



Kamloops: 2 . . 10 . . 13 . . . . 12 . . 5 . . 4 



Ventral setae: Similar to those of E. setosa. Data from four 

 specimens : Number of first sternals, 2 ; of second sternals, 2 ; of 

 poststernals, 36 to 41. Length of first sternals, 44 to 55 ; of second 

 sternals, 38 to 43 ; of setae near the middle of the first poststernal 

 row, 29 to 36; of setae in the posterior group, 36 to 41. 



Material: Cotypes of E. sckiricola (USNM 892) of E. ameri- 

 cana (USNM 1277) and specimen from Kamloops, British Colum- 

 bia, are in U. S. National Museum. Other specimens from Rocky 

 Mountain Laboratory. Specimens from hosts: 



Sciurus [=^ Tatniasciurus] hudsonicus 

 richardsoni 

 Montana 



Florence: 19 (cotypes E. sciuri- 

 cola). 

 Chipmunk 

 Idaho 



Boise County: Sept. 20, 1930, 1 

 (cotype E. arnericana) . 



Sciurus [= Tamiasciurus} h. streatori 

 British Columbia 



Kamloops: July 5, 1936, 1. 

 Pine squirrel 

 Montana 

 Ravalli County: Dec. 1944, 1. 

 Tamiasciuriis sp. 

 Montana 



Ravalli County: Aug. 17, 1945, 1; 

 Nov. 1945, 1. 



Seasonal distribution: E. scmricola has been collected in 

 July, August, September, and December. 



Geographic distribution: E. sciuricola has been collected in 

 Idaho, Montana, and British Columbia (fig. 8,a). 



Diagnosis: E. scmricola can be distinguished from the other 

 members of the "blarinae" group by the following combination 

 of characters : Posterior body setae not leaf life, scutum and free 

 leg segments without punctae, head of sensilla cordiform. It is 

 much like the eastern E. setosa, from which it can be distin- 

 guished by the cordiform head of its sensilla, by the lack of punc- 

 tae on its cheliceral base, and by the more distinct dorsal tooth on 

 its cheliceral blade. 



Remarks : The specimens in the U. S. National Museum com- 

 prising the cotypes of E. sciuricola are badly distorted. The speci- 

 mens comprising the cotypes of E. arnericana are reasonably dis- 

 tinct. So far as can be determined at this tim.e, there is no es- 

 sential difference between the two. From the original descriptions 

 the palpal cla^y might be used as a distinguishing character. The 

 palpal claw of E. sciuricola was given as 3-pronged; that of 

 E, arnericana as 5- or 7-pronged. The palpal claw of E. anieri- 

 cana conforms with the original description. The palpal claw 

 cannot be seen clearly on the cotypes of E. sciuricola, but there 

 are indications of five prongs. The type specimens of E. sciuricola 



