02 wii.liston: new diptkra. 



joints elongate. Antennae longer than the head and thorax together, 

 brown; fourth joint a little shorter than the third, the fifth and sixth 

 together as long as the preceding joints; the four distal joints with 

 bristles on the under surface. Thorax opaque, light bluish gra}', the 

 mesonotuni with four brown stripes, of which the lateral ones are 

 abbreviated; pile of the mesonotuni like that of the head, abundant. 

 Halteres reddish, the knob brown. Abdomen brownish black, but 

 little shining, with light-colored j)ile. Legs dark brown; the tibiae, 

 for the greater part, reddish. Wings nearly hyaline; st-igma dark 

 brown; first posterior cell a little longer than the first submarginal; 

 five posterior cells; petiole of the second posterior cell twice as long 

 as the cell itself, the cell wanting in one wing of the single specimen. 



Female. Antennae about as long as the mesonotuni, the bristles of 

 the under side inconsjiicuous; fourth joint about one-third of the 

 length of the third, the following joints successively shorter; not less 

 than ten-jointed. Color of the pleurae and legs more reddish. Second 

 posterior cell as long as its petiole. 



Length, male. 12 mm; with antennae, 20 mm. Length, female, 

 20 mm. 



Two specimens, Washington, University of Kansas. This species 

 is nearest related to /:'. s/>i;iosa and E. califoniica of Osten Sacken, 

 but will at once be distinguished by the much shorter antennae. 



Rhaphidolabis debilis, n. sp. 



Female. Head blackish fuscous, the occiput somewhat grayish; 

 the frontal tubercle small. Antennae and palpi nearly black, the first 

 two joints of the former rediUsh. Thorax yellow, the pleurae in the 

 middle brownish; mesonotuni dark brown with its margins yellowish, 

 the brown separated by two slender, yellowish lines. Halteres brown, 

 yellowish on the j^roximal part. Abdomen brownish yellow. Legs 

 brownish yellow, the femora yellow on the proximal portion; distal 

 joints of the tarsi blackish; tarsi shorter than the tibiae, the first joint 

 longer than the succeeding four together. Wings with a light brownish 

 tinge: the auxiliary vein terminates a little beyond the great cross- 

 vein; the origin of the second vein is opposite the termination of the 

 seventh vein; marginal cross-vein at some distance from the tip of the 

 first vein; the third vein is branched, not the second, and the petiole 

 of the submarginal cell is as long as the discal cell; petiole of the 

 second posterior cell equal to a half of the length of the discal cell; 

 base of the fourth posterior cell a little beyond the middle of the 

 discal cell. Tibial spurs and the pulvilli distinct. 



Length. 9-10 mm. 



California. University of Kansas collection. 



