126 CALIFORNIA ACADEMY OF SCIENCES. 



longitudinal, submarginal, pale band, parallel with the 

 lateral margins of the abdomen; last segment broadly 

 rounded, with several long hairs near the lateral mar- 

 gin and some shorter hairs on the posterior portion of 

 the segment; ventral surface with at least one series of 

 short pustulated hairs on the posterior margin of each 

 segment; genitalia distinct, angular, extending far for- 

 ward in the body. 



Menopon distinctum n. sp. (Plate VIII, fig. 7). 



Specimens from two specimens of the Ash-throated 

 Flycatcher, Myiarchus cinerascens (Palo Alto and Onta- 

 rio, California), and from a Cactus Wren, He.leodytes 

 hrv/iineicapillus (Ontario, California). A well marked 

 form. 



Description of the female. Body, length 1.5 mm. 

 width .62 mm., elongate-ellipitical; pale translucent 

 fuscous with blackish brown ocular blotches; black ocu- 

 lar fleck and small blackish spots on the lateral margins 

 of the front; dark transverse blotches on the abdomen; 

 a distinct pale submarginal longitudinal line parallel 

 with the lateral margin of the abdomen. 



Head, length .31 mm., width .46 mm.; parabolic, 

 wide through the temples; front broadly rounding, a 

 slight angulation in front; one hair each side of this 

 angulation; two hairs on the lateral margin of the 

 front; two long hairs on a slight swelling in front of a 

 distinct ocular emargination; one long and two short 

 hairs on the dorsal surface, in front of the ocular emar- 

 gination; eye large, filling the angle of the emargina- 

 tion and extending on the temple, with a slight con- 

 striction; a short spine on the posterior portion, and a 

 large black ocular fleck; ocular fringe made up of com- 

 paratively few stiff spines, more numerous on the outer 



