136 CALIFORNIA ACADEMY OF SCIENCES. 



chitin bars distinct, dark brown, while the ground color 

 of the prothorax is even pale fulvous. Mesothorax long, 

 with strongly diverging sides; posterior angles sharp, 

 with several long hairs and broad heavy spines; a series 

 of hairs on the posterior margin; ground color pale 

 fulvous with distinct, narrow chitin bars extending 

 from the anterior angles across the mesothorax, a second 

 pair of chitin bars extending from the lateral margins 

 across the meso- and metathorax. Metathorax narrow; 

 posterior angles with a few long hairs and heavy spines; 

 posterior margin with a series of hairs; intercoxal lines 

 showing through the thorax. Legs pale fulvous with 

 darker marginal markings. 



Abdomen broadly elliptical, short; posterior angles 

 with one or two long hairs and some heavy spines; a 

 series of hairs on the posterior margin of the segments, 

 which give place to heavy spines near the lateral mar- 

 gin; a few scattered dorsal spines; last segment flatly 

 rounded, with a few short marginal spines; narrow 

 dark fuscous transverse bands, separated by broad pale 

 transverse bands. 



Physostomum. 



"We have representatives of this genus from a dozen 

 species of passerine birds, but we do not feel able to 

 make satisfactory specific determination of our material 

 except in a few instances. We do not believe that 

 under the present knowledge of the group much can be 

 done toward distinguishing any but peculiar and 

 obviously characterized species, forms readily separable 

 by marked peculiarity of shape. We have specimens 

 of this genus from the following birds, all from Cali- 

 fornia: Western Wood Pewee, Contopus richardsonii 

 (two specimens); Say's Phcebe, Sayornis saya; Western 



