CHIGGERS — FARRELL 139 



sternals, 2; of poststernals, 47 to 50. Length of first sternals, 47 

 to 59; of second sternals, 35 to 86; of setae near the middle of 

 the first poststernal row, 25 to 26 ; of setae in the posterior group, 

 41 to 44. 



Material: All cotypes in USNM (type No. 990). Specimens 

 from host: 



Mole 



Benton County, Oreg., May 17, 1912, 5 (cotypes). 



Diagnosis : E. oregonensis can be distinguished by the follow- 

 ing combination of characters : Tibiala III, subterminala and para- 

 subterminala I, and two genualae I present; five prongs on papal 

 claw; two pairs of eyes; galeal seta branched; lateral seta on 

 palpal tibia branched. It is very close to E. samboni, as the 

 species are now defined, but it can be distinguished by the smaller 

 setae on its gnathosoma and the branched lateral seta on its palpal 

 tibia. 



Remarks: The original description of E. oregonensis is a 

 description of a chigger typical of the genus Trombicula. The 

 type host is given as a mole and the type locality as Corvallis, 

 Oreg. The type slide is given as No. 990, U. S. National Museum. 

 However, the specimens from the type slide, type host, and type 

 locality, as indicated, are Euschongastia. Fuller (1948), after 

 examining the type specimens, placed the species in the genus 

 Euschongastia. The original description is not adequate for iden- 

 tification of the chiggers from the slide, but it does validate the 

 name. The type specimen or specimens are the name bearers 

 for the species. Therefore, Fuller's combination is here consid- 

 ered to be correct and the name of the species to be Euschon- 

 gastia oregonensis (Ewing, 1929). 



The specimen of the cotypal series found on the slide marked 

 "C. E. F. X." is here designated lectotype. 



7. Euschongastia samboni (Radford) 

 Figure 4,a; Plates 8, 20 



Neoschongastia samboni Radford, 1942, pp. 76-77, fig. 99; 1947a, pp. 579, 



599-600, figs. 27, 28; 1947b, p. 275. 

 Euschongastia samboni, Brennan, 1948, p. 476. — Fuller, 1952, pp. 182, 184. 



Description : Size : Length, 300 to 570 ; width, 200 to 510. 

 Shape : Ovoid to very broad oval. 



Gnathosoma: Seta on palpal femur strong, with moderate 

 number of setules. Seta on palpal genu smaller with relatively 



