90 CALIFORNIA ACADEMY OF SCIENCES. 



extremities, the posterior borders almost meeting on the 

 median line. Metathorax as wide as the head, sides 

 diverging strongly; posterior angles with three or four 

 long hairs, a series of pustulated hairs along the outer 

 third of the posterior margin that is rounded upon the 

 abdomen; dark, interrupted lateral blotches narrow and 

 marginal on the anterior angles, and large, irregular 

 submarginal blotches, darker near the posterior angles, 

 growing paler near the middle. Sternal markings con- 

 sisting of distinct intercoxal lines and a pale brown 

 median blotch on the metasternum. Legs translucent- 

 whitish with blackish brown marginal bands and semi- 

 annulations. 

 « Abdomen very long, elliptical, with subparallel sides 

 not tapering posteriorly until after segment 7; posterior 

 angles of the segments slightly projecting, each bearing 

 one weak hair, till segment 7, which has two hairs in the 

 angle; segment 8 has one lateral marginal hair besides 

 two hairs in the posterior angle; segment 9 broadly 

 rounding, with angular emarginations, two short hairs 

 on the posterior margin; two dorsal hairs arising near 

 the posterior angle of each segment except segment 8 

 which has a series of posterior marginal hairs; pale 

 translucent whitish with distinct, narrow blackish 

 brown linear bands on the lateral margins of segments 

 1 to 7; segment 8 with small pale brown blotches near 

 the lateral margin and one pale brown blotch on the 

 median line; last segment uncolored; genital blotches 

 pale brown, linear each side of the median line on the 

 posterior margin of segment 7, also a pale brown blotch 

 on the median line of segment 6. 



Nirmus lautiusculus n. sp. (Plate VI, fig. 9). 



A single male from a Bell's Sparrow, Amphispiza belli 

 (Ontario, California). The new species, strikingly 



