134 INSECUTOR INSCITLT5 MENSTRUUS 



Barheriella agree in having the tip of the fifth vein extending 

 slightly beyond the tip of the first vein. This character was 

 stated in my paper "stigma shorter than distance betvv^een the 

 tips of the first and third veins." In chilosioides these distances 

 are about the same but the wording of the character may be 

 changed to tip of fifth vein extending beyond tip of first vein 

 and will serve to further separate groups 3 and 4. 



Chrysogaster alaskensis, new species. 



A very large species for Chrysogaster, uniformly blackish 

 aeneous ; dorsum of abdomen shining. 



Female. — Frons broad but little widening from posterior 

 margin to antennae, faintly, but widely rugulose ; clothed with 

 black pile except on antennal front (i. e., a fairly wide stripe 

 just above the antennae and comprising the lower sixth of the 

 frons) ; antennae jet black; second joint bearing bristles above 

 and below, one of the upper ones being greater in length than 

 width of second joint; arista nearly equal to width of frons, 

 pubescent ; face flat, slightly receding, epistoma well developed, 

 bearing pile only on the sides, the epistoma and the jowls. 



Mesonotum with two median faint stripes anteriorly ; pile 

 largely black with a little luteous intermixed; scutellum with 

 fairly long, rather coarse black pile, the lower posterior border 

 with downward projecting luteous pile ; pleurae with black pile, 

 becoming light colored on upper region of sternopleura. 



Legs black, pile ranging from black to light golden. 



Dorsum of abdomen somewhat flattened, shining black 

 aeneous, somewhat opaque on middle of second and third seg- 

 ments, clothed with pale pile. 



Wings a little smoky, stigma dark brown. Apical cross-vein 

 forming an acute angle with the third vein ; tip of fifth vein 

 extending beyond tip of first vein ; petiole beyond anal cell 

 shorter than length of discal cross-vein. Squamae and plumula 

 yellowish white ; halteres reddish yellow. 



Length 8.5 mm. ; wing 7.5 mm. 



Type.— Cat. No. 253S6. U. S. Nat. Mus. 



