X86 PROCEEDINGS OF THE NATIONAL MUSEUM yOL. IM 



Summary of standard data from five specimens, including the 

 type, from Jefferson County, Pa. : 



AW 67-76, mean 71.2; PW 98-114, mean 106.2; AP 24-27, mean 

 25.6; SB 32-38, mean 35.4; ASB 28-31, mean 29.8; PSB 9-12, mean 

 10.6; AL 56-63, mean 58.8; AM 44-56, mean 47.8; PL 76-82, mean 

 80.8; S 40-47, mean 43.6. Width of head of sensilla, 13 to 15, mean 

 13.4. 



Eyes: Two pairs; anterior pair lateral to posterolateral setae. 

 Diameter of anterior pair in five specimens, 12 to 14, mean 13; of 

 posterior pair, 10 to 14, mean 12.6. 



Dorsal setae: Rather heavy with relatively few heavy setules. 

 Length of humerals, 72 to 90; of setae near the middle of the 

 first posthumeral row, 57 to 63; of setae in the posterior group, 

 50 to 54. Tendency for setae to occur out of line in anterior rows 

 not so pronounced as in E. luteodema. 



Dorsal formulae of five specimens from Jefferson County, Pa. : 



. 10 . . 8 . . 6 . . 2 (type) 

 . 13 .. 8 .. 7 .. 1 

 . 11 .. 8 .. 6 .. 2 

 . 12 .. 9 .. 6 .. 3 

 . 13 .. 8 .. 7 .. 3 



Ventral setae: Setules on sternals and anterior poststernals . 

 fine, becoming heavier posteriorly. Data from five specimens: 

 Number of first sternals, 2 ; of second sternals, 2 ; of poststernals, 

 40 to 50. Length of first sternals, 50 to 58; of second sternals, 

 42 to 50; of setae near the middle of the first poststernal row, 36 

 to 40; of setae in the posterior group, 47 to 56. 



Anomaly: One nude second sternal on the type. 



Material : Type, USNM 1995. Specimens from hosts : 



Marmota 



Pennsylvania 



Warren County: July 12, 1948, 



Du-1. i 



Marmota m. monax 

 Pennsylvania 

 Jefferson County: Apr. 19, 1948, 

 USNM-type+4, DU-7, RMI^2, 

 CEF-4, CM-2, KU-1, Afr-1, 

 Aus-1; June 8, 1948, DU-4, 

 CEF-1. 



Seasonal distribution : E. marmotae has been collected dur-: 

 ing the spring and summer months of April, June, and July. 



Geographic distribution: E. marmotae has been collected ir 

 northwestern Pennsylvania (fig. 7,a). 



Diagnosis : E. marmotae has the characters of the "luteodema* 

 group. It is easily distinguished from E. luteodema by havinj 

 a genuala II and a genuala III. 



