CHIGGERS — FARRELL 181 



on slightly extended corners; anteromedian on an anterior con- 

 vexity. Setae well covered with setules. Pseudostigmata well 

 behind a line drawn connecting posterolaterals; deeply set. Sen- 

 sillae with expanded, cordiform heads well covered with setules 

 on the anterior surface, sparsely covered on the posterior surface. 

 A ridge apparent anterior to each pseudostigma, the sensilla 

 lying in a depression behind it. No punctae seen. 



Standard data of the single specimen from Los Angeles, Calif, 

 (expanded portion of sensilla only measured) : 



AW PW AP S3 ASB PSB AL AM PL S 

 47 60 14 20 27 12 50 32 44 20 



Eyes: Two pairs, prominent; anterior pair lateral to the pos- 

 terolateral setae. Diameters of both anterior and posterior eyes, 

 12. 



Dorsal setae: Nude adjacent to body. Setules rather short. 

 Free ends blunt or V-cleft. Length of humeral, 40 ; of a seta near 

 the middle of the first posthumeral row, 38; of a seta from the 

 posterior group, 34. 



Dorsal formula of the single specimen from Los Angeles 

 County, Calif. : 



2 .. 12 .. 10 .. 2 .. 10 .. 2 .. 9 .. 6 .. 4 



Ventral setae: Free ends of anterior setae fine, becoming 

 heavier and more blunt posteriorly. Number of first sternals, 2; 

 of second sternals, 2 ; of poststernals, about 48. Length of a first 

 sternal, 44; of a second sternal, 29; of a seta near the middle 

 of the first poststernal row, 20 ; of a seta in the posterior group, 

 33. 



Material: All specimens in the U. S. National Museum. 

 Specimens from hosts : 



Ground squirrel Neotoma sp. 



Topaz, Calif., 4. Los Angeles County, Calif., Jan. 13, 



1933, 1. 



Diagnosis : E. calif ornica closely resembles E. criceticola, from 

 which it can be distinguished by the more strongly branched 

 lateral seta on the palpal tibia and by the different character of 

 the nonspecialized leg setae. In E. criceticola the tendency for the 

 body setae to teiTninate bluntly is less marked. In E. calif ornica 

 the expanded portion of the sensilla is shorter and there is less 

 taper into the pedicel than in E. criceticola. 



Remarks: In the specimen upon which this rediscription has 

 been based, the number of nonspecialized setae on the palpal 

 tarsus could not be determined. 



Ewing's original description of Ettschongastia calif ornica was 



