^QQ PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 106 



Standard data for the two specimens from Union County, Pa. : 



AW PW AP SB ASB PSB AL AM PL S 



62 78 24 22 38 14 70 43 69 35 (Type) 



59 76 24 19 35 15 67 40 67 25* 



*Head of sensilla only. 



Eyes : Two pairs ; diameters of both pairs, 12 to 13. 



Dorsal setae: Similar in form to those of E, rubra; anterior 

 and posterior setae of the same form. Total number greater than 

 in E. rubra, chiefly because of two extra rows of setae. The extra 

 rows are shown in italic in the dorsal formulae. Length of 

 humerals, 61 to 63; of setae near the middle of the first post- 

 humeral row, 50 to 55 ; of setae in the posterior group, 41 to 43. 



Dorsal formulae for the two specimens from Union County, 

 Pa.: 



2.. 15.. 6-.. 17.. 5.. 13.. 3 .. 11 .. 10 +10 .. .. (Type) 



2 . . 14 . . 6 ..18 .. 11 .. U .. .. 9 . . 9 . . 7 . . 2 . . 2 



Ventral setae: Poststernals similar to those of E. rubra; 

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

 107. Length of first sternals, 58 to 67 ; of second sternals, 40 to 

 41 ; of setae near the middle of the first poststernal row, 34 ; of 

 setae in the posterior gi'oup, 38 to 43. 



Material: Type, USNM 1992. Specimens from hosts, all from 

 Pennsylvania : 



Clethrionomys g. gapperi 

 Union County: May 24, 1949, 

 DU-1. 



Neotoma magister 



Union County: May 16, 1949, 

 USNM-Type. 



Geographic distribution : E. magna has been collected only 

 in Union County, Pa. (fig. 4,&). 



Diagnosis: E. magna can be distinguished from the other 

 species in the group by the larger size of its scutum and the extra 

 rows of setae in the dorsal formula. 



Remarks : The type specimen of E. magna was found in asso- 

 ciation with E. peromysci and E. diversa diversa on Neotoma 

 magister. E. magna has been named for the larger size of the 

 scutum. 



12. Luschdiifiaatia diversa, new species 



Euschongastia diversa is a northern form, divided into two 

 subspecies. Morphologically it differs from the more southern 

 E. mbra by a general reduction in the number of setules on the 

 setae of the gnathosoma, fewer body setae which differ in form 

 on the anterior and posterior portions of the body, and a some- 

 what larger scutum which tends to be rectangular in general 

 outline. 



