NORTH AMERICAN DIPTERA. 287 



DIPTEROL.OGICAI. ]¥OTES AND DESCRIPTIONS. 



BY S. W. WILLISTON. 



LEPTID^. 



Symphoroinyia pachyceras n. sp. 



3Iale. — Opaque black, first anteunal joint very much thickened; wings yellow. 

 Length 5-6 mm. 



Antennse black, first joint very much thickened, bushy black hairy. Face gray 

 polliuose, but mostly concealed ; palpi porrect, bushy black pilose. Dorsum of 

 thorax opaque black, with only faint indications of brown stripes and with long 

 black pile ; abdomen opaque black, in front and on the sides anterioi-ly with long 

 yellow pile, posteriorly with black pile. Legs blackish pitchy ; tarsi mostly black. 

 Wings with a sti-ong brownish yellow tinge. 



Female. — Gray pollinose ; dorsum of thorax with three brown stripes ; first an- 

 teunal joint less thickened; wings nearly hyaline. Head densely bluish gray 

 pollinose, the sides of the front brownish ; front with black pile. First antennal 

 joint moderately swollen, not bushy pollinose, third black ; palpi gray, with short, 

 light colored pile. Occiput below with white pile. Thorax densely bluish gray 

 pollinose, nearly bare ; dorsum with three broad brown stripes, the middle one 

 sometimes divided by a line. Abdomen brownish gray polliuose, nearly bare. 

 Legs black, knees narrowly luteous. Wings nearly hyaline, stigma brown. 



One male and three females. Northern California. The females 

 differ very much from the male ; I believe they belong together, 

 nevertheless. 



iSyinphoroniyia plageiis n. sp. 



3Iale. — First antennal joint much thickened, third yellowish red; abdomen 

 shining metallescent black ; wings brownLsh clouded ; femora black. Length 

 7 mm. 



First antennal joint much thickened and bushy black hairy, black, gray pol- 

 linose ; third joint yellowish red, reniform, arista black. Face thickly gray pol- 

 linose; palpi cylindrical, porrect, bushy black pilose. Dorsum of thorax black, 

 scarcely shining, with grayish pollen and long black pile. Abdomen shining 

 metallescent black, on the sides and in front with long yellow pile, posteriorly 

 with more or less black pile. Legs black, with black pile, the tip of femora, the 

 tibise and tarsi luteous, the distal part of the last blackish. Wings with a brown 

 tinge, strongest near the middle. Knobs of halteres brown. 



Two specimens, Washington and Mt. Hood, Oregon. 



ASILID.E. 



Ceraturgn^i iiigripes u. sp. 



Male. — Abdomen with golden pollinose posterior cross-bands; legs black. 

 Length 14 mm. 



