514 CALIFORNIA ACADEMY OF SCIENCES. 



narrowed tip at the apex of the posterior angle ; temporal 

 margins with three longish hairs and a few short ones; 

 markings weakly colored, a pale chestnut brown. 



Prothorax, with distinct lateral angles, in apex of which 

 a spine and a long hair; another long hair near rounded 

 posterior angle, and two spines on margin in front of 

 lateral angle; segment whitish, with faint brownish tinges 

 on lateral borders and elsewhere. Metathorax with weak 

 concavity on lateral margins in front of the middle; two 

 hairs in the posterior angles, and some scattered short 

 spines on margin and dorsal surface of anterior half 

 (mesothorax) of segment; color of prothorax, with brown 

 lateral borders narrowing anteriorly. Legs concolorous 

 with thorax, with narrow darker marginal color. 



Abdomen large, expanding in the middle half, and 

 broad and bluntly rounded behind; not very long single 

 hairs in the posterior angles, and on the dorsal surface 

 just inside of the colored lateral bands a double longi- 

 tudinal row of weak hairs; whitish, with distinct brown 

 lateral bands and large oblong median abdominal blotches, 

 darkest on segments 5 and 6. 



Physostomum sucinaceum n. sp. (Plate lxx, fig. 2.) 



Three females from a Western Flycatcher, Emfidonax 

 difficilis (Palo Alto, California). A small Physostomum , 

 the smallest 1 have taken. 



Description of female. Body, length 2.84 mm., width 

 .81 mm.; ground color pale amber instead of whitish, as 

 is usual with Physostomum; brownish lateral bands, and 

 head markings not strongly colored. 



Head, length .53 mm., width .5 mm.; front rounded, 

 with usual few hairs; palpi short, barely passing the mar- 

 gins of head ; temples produced backwards and acutely 

 angled with three longish hairs and some short ones ; 



