NEW MALLUl'HACA. 89 



several long dorsal hairs; ventral surface with broad 

 median transverse bands of dark fusooiis; blotches of 

 the last segment posteriorly emarginate and laterally 

 interrui)ted by the pustulations of two long hairs: these 

 ventral blotches show through above. 



Nirmus ductilis n. sp. (Plate \'I, fig. 8). 



One female from a Western Flycatcher, Enipidonax 

 dijfficilis (Ontario, California). A meml}er of the grouj) 

 interrupio-fasciati, but well distinguished by its sharp, 

 •distinct, blackish marginal markings, without trace of 

 median abdominal blotches. 



Description of the female. Body, length 1.0 mm., 

 width .4 mm.; long, slender, transparent white, wiUi 

 narrow, distinct, blackish lateral margins of head and 

 abdomen. 



Head, length .37 mm., width .28 mm.; elongate, con- 

 ical, front narrow and slightly concave; a few short 

 hairs along the margin of the front, the longest hair in 

 front of the trabecuke, which are small but distinct and 

 uncolored; antenna? with second segment longest, seg- 

 ment 5 longer than segments 3 or 4, segments 1 and 2 

 pale transparent whitish, segment 3 with a slight shade 

 of brown, segments 4 and 5 dark brown; eye with a 

 prickle; temporal margins with one long hair and two 

 or three prickles; occipital margin slightly convex; 

 antennal bands narrow, blackish brown, fading out along 

 the inner margins and anteriorly, before reaching the 

 uncolored frontal margin, the posterior extremities 

 bending angularly in, meeting the dark ocular blotches 

 which in turn nu'et the dark brown marginal borders of 

 the temples. 



Prothorax with flatly rounding lateral margins and 

 posterior angles, dark blackish brown lateral borders, 

 which bend in and back on the anterior and posterior 



