INSECUTOR INSClTliE MENSTRUUS 139 



clothed with pile entirely luteous in color; eyes hairy; face 

 bare ; a few long and very slender hairs, besides the usual pile, 

 on scutellum which are also luteous in color; antennae and 

 arista yellowish brown; third joint small, about twice as large 

 as second; arista fairly short, bare; face moderately concave 

 between the eyes and tubercle ; tubercle prominent, not extend- 

 ing as far as base of antennae. Femora black, darkened at their 

 apices; tibiae yellow, broadly darkened in the middle; tarsi 

 brownish. Abdomen but little opaque on second and third 

 tergites. Wings luteous throughout, more deeply so basally; 

 squamae white; halteres reddish brown. Length 7.5 mm.; wing 

 6.5 mm. 



Female. — Of medium size, otherwise similar in general ap- 

 pearance to male. Antennae reddish yellow; third joint about 

 four times as large as the second ; arista subequal to width of 

 f rons at antennae ; face rather deeply excavated ; tubercle pro- 

 nounced and extending beyond antennal base. Legs with color 

 pattern similar to male but more orange in color. Wings rather 

 broad, luteous. Length 8.75 mm. ; wing 7.25 mm. 



Type.— Cat. No. 25373, U. S. Nat. A^Ius., male. One female, 

 allotype. 



Collected at Moore's Lake, Idaho, July 10, 1907, by J. M. 

 Aldrich. 



Chilosia bicolorata, new species. 



Female. — Large species ; eyes pilose, face bare ; thorax with 

 long, dense pale pile ; abdomen with short black pile on third, 

 fourth and fifth segments ; thorax brassy, abdomen shining 

 black ; pile on f rons, eyes and facial strips long and pale ; face 

 prominent, produced downward, covered with unusually long 

 pubescence but which is by no means as long as pile on facial 

 strips. Antennae reddish yellow, third joint large, its lower 

 edge rounded; arista brown, equal to width of frons at base 

 of antennae. Thoracic pile luteous. Femora black with brown- 

 ish apices ; tibiae brown with l:)road median black band ; tarsi 

 blackish. Sides of first and second and basal corners of third 

 tergite brassy with luteous pile; rest of abdomen black with 



