58 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3U Ser. 



than the second. Wings gray, immaculate; third and fourth veins perfectly 

 parallel, the latter ending in the tip of the wing. Costa with a pronounced 

 thickening beyond the tip of the first vein. Posterior cross-vein oblique, 

 about two and one-half times its own length distant from the posterior 

 border when measured along the distal segment of the fifth vein. Halteres 

 and tegulse yellow, the latter with long brown cilia. 



One specimen of this interesting species taken by Pro- 

 fessor J. M. Aldrich in South Dakota. The head has col- 

 lapsed in drying, so that I am unable to give an adequate 

 description of the antennee. 



Campsicnemus Haliday. 



More than twenty species of this interesting genus have 

 been described from Europe, but up to the present time 

 only two were known from this continent, viz., C. hirti;pes 

 Loew (figs. 107-109) and C. claudicans Loew (fig. 113). 

 The four new species here added occur in the Western 

 States, and are mostly alpine or boreal. In the following 

 tables only the males are included: — 



1. Middle tibiae more or less incrassated ; 2 



Middle tibias not incrassated degener, sp. nov. 



2. Middle tibiae with only a slight proximal thickening. ^ 



hirtipes Loew. 

 Middle tibiae incrassated throughout ,. 3 



3. Middle tibiae with a pedunculated knob near their apices. 



Philoctetes, sp. nov. 

 Middle tibiae without a knob 4 



4. Middle tibiae entirely black CEdipus, sp. nov. 



Middle tibiae in great part yellow 5 



5. Middle metatarsus strongly curved Thersites, sp. nov. 



Middle metatarsus not strongly curved claudicans Loew. 



57. Campsicnemus degener, sp. nov. 



Plate IV, Figs. 110-112. 



Male. Length 1.5-2.3 mm.; length of wing 2-2.5 mm. Proboscis and 

 palpi piceous, the latter with white hairs. Face narrow, covered with ochre 

 yellow dust. Antennae black, third joint small, not very pointed, pubescent, 

 arista slender, with very short pubescence. Front steel-blue towards the 

 orbits. Postocular cilia black above, yellow below. Thorax subopaque 

 with yellowish brown dust, and with a median bluish stripe. Scutellum 

 opaque brown in the middle, shining steel-blue along its lateral and posterior 

 edges. Abdomen bronze black, more shining than the thorax. Pleurae 



