184 PROCEEDINGS OP THE NATIONAL MUSEUM yOL. 106 



Setae numerous, tend to occur in bands rather than in rows 

 anteriorly. Length of humerals, 50 to 67 ; of setae near the middle 

 of the first posthumeral row, 41 to 56; of setae in the posterior 

 group, 88 to 49. 



Dorsal formulae for five specimens: 



Tamiasciurus 

 Montana 



Ravalli County: Mar. 27, 1946, 2. 



Ventral setae: Sternals with finer setules, other ventral setae 

 similar in form to dorsals. Data from five specimens : Number of 

 first sternals, 2; of second sternals, 2; of poststernals, 40 to 50. 

 Length of anterior sternals, 41 to 51 ; of second sternals, 82 to ' 

 41 ; of setae in the middle of the first poststernal row, 28 to 88 ; 

 of setae from the posterior group, 38 to 49. 



Anomaly: Two specimens with three first sternals. 



Material: All paratypes. The two specimens from Tamias-- 

 ciurus in the Rocky Mountain Laboratory; all other specimens! 

 in the U. S. National Museum. Specimens from hosts: 



Marmota 

 Montana 

 Ravalli County: May 17, 1945, 

 4; July 30, 1945, 4. 

 Idaho 



Camas County: June 30, 1945, 2. 



Seasonal DISTRIBUTION : Brennan (1948) reported collections 

 during the months of March, April, May, June, and July. 



Geographic distribution: Brennan (1948) listed collections 

 from Ravalli County, Mont., and Camas and Elmore Counties, i 

 Idaho (fig. 7,(1). I 



Diagnosis: E. luteodema is the only North American species 

 which lacks specialized setae on the genu II, the genu III, and 

 the tibia III. 



17. Enschdngastia marmotae, new species 



Figure 7,a; Plates 7, 16 



Description: Size: Engorged length, 430 to 660; width, 840( 

 to 615. 



Shape: Broad ovoid to broad oval. 



Color: Orange. 



Gnathosoma: Seta on palpal femur strong with relatively few 

 setules on its convex curvature. Seta on palpal genu with few 



