228 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 106 



Standard data of three paratypes from Santa Cruz County, 



Calif.: 



AW PW AP SB ASB PSB AL AM PL S 



47 68 21 24 22 13 18 25 29 



49 75 25 26 23 13 23 28 32 34 x 11 



46 64 22 17 19 14 22 - 38 36 x 10 



Eyes: Two pairs in ocular plates; cornea not well defined on 

 posteriors ; diameter of anteriors about 9 ; of posteriors, 6. 



Dorsal setae: Small, with short setules. Length of a humeral 

 seta, 28 ; of a seta from the first row of posthumerals, 25 ; of a 

 posterior seta, 19. 



Dorsal formulae of two paratypes from Santa Cruz County, 

 Calif.: 



2. .6. .6. .6. .6. .2 

 2. .6. .6. .6. .8. .4 



Ventral setae : Sternals and poststernals anterior to anus with 

 longer, finer setules than dorsals. Setae posterior to anus similar 

 to dorsals. Length of a first sternal, 24 ; of a second sternal, 24 ; 

 poststernals all about the same length, 19. 



Ventral formulae of two paratypes from Santa Cruz County, 



Calif.: 



2 . . 2 plus about 26 

 2 . . 2 plus about 24 



Material: One paratype borrowed from the Rocky Mountain 

 Laboratory and two from the U. S. National Museum. Specimens 

 from host: 



Sceloporus o. occidentalis 



Santa Cruz County, Calif., Aug. 15, 1945, 3. 



Diagnosis: E. lacerta differs from E. bigenuala, the other 

 member of the "lacerta" group, by having a single genuala I, the 

 microspur I distal to the spur, and the eyes in ocular plates. 



Remarks : E. lacerta is known from only one collection of four 

 specimens, the type series. It is the only North American 

 Eicschongastia reported from a cold-blooded vertebrate host. 



2. Euschongastia bigenuala, new species 



Figure 4,a; Plates 6, 9 



Description : With the characters of the group. 



Size : Length, 350 ; width, 235. 



Shape: Oval. 



Gnathosoma : Palps and chelicera similar to those of E. lacerta. 

 Blade of chelicera more curved. Palpal claw with three prongs. 

 Galeal seta with one setule. 



