54 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



entirely black, fore and middle tarsi blackened from the tip of the first joint. 

 Fore tibis swollen, with a single bristle on the anterior surface near the 

 base; fore tarsi longer than the fore tibiae; first joint very short and rather 

 thick, second joint nearly as long as the third and fourth joints taken 

 together; third, fourth and fifth joints successively shorter, the third and 

 fourth with somewhat longer and denser hairs on their upper surfaces. Mid- 

 dle tarsi slender, shorter than the middle tibiae, first joint longer than all the 

 remaining joints together; middle femora with two preapical bristles; middle 

 and hind tibiffi with several prominent bristles on their posterior surfaces. 

 Hind tarsi nearly as long as the hind tibiae; first joint distinctly thicker and 

 shorter than the second. Wings gray, much narrowed towards their bases, 

 so that the posterior margin runs close to the sixth vein. Third vein gently 

 bent downwards near its tip and running parallel with the fourth vein which 

 terminates exactly in the tip of the wing; posterior cross-vein one-third as 

 long as the distal segment of the fifth vein. Halteres and tegulae yellow, the 

 latter with long yellow cilia. 



Female. Length 2.5 mm.; length of wing 3 mm. Palpi and proboscis 

 larger, face broader than in the male; the former are piceous, the latter cov- 

 ered with gray dust. Third antennal joint not longer than broad, evenly 

 rounded, arista dorsal, nearly as long as that of the male and pubescent, but 

 tapering to a point. Coloration of body like that of the male. Legs plain 

 throughout, first joint of fore tarsi nearly as long as the remaining joints taken 

 together; fore tibiae not swollen; hind tibiae and femora without brown tips. 

 Wings broader towards the base than in the male; sixth vein delicate but 

 distinct. 



Numerous specimens of both sexes taken in sweepings 

 during July, 1896, about marshy spots in woods near Mon- 

 terey, Cahf. 



The species resembles the eastern N. fortunatus,\>Vi\. may 

 be readily distinguished by the lamellate arista of the male 

 and the wing being less narrowed at the base. 



53. Nothosympycnus sobrinus, sp. nov. 

 Plate III, Figs. 88-91. 



Male. Length 3 mm. ; length of wings 3 mm. Palpi small, piceous. Face 

 rather broad, covered with brilliant snow-white dust. Antennae black; first 

 joint long, cylindrical; third joint rather large, oval, pilose, bearing near its 

 base on the dorsal side a rather short, slightly pubescent arista which is 

 slightly but distinctly incrassated just before the pointed tip. Front shining 

 metallic violet. Postocular cilia black above, white below. Thorax dark 

 bronze green, covered with brownish dust. Scutellum with a distinct violet 

 reflection. Abdomen slender, laterally compressed, obliquely truncated 

 posteriorly, of the same color as the thorax, venter yellow. Hypopygium 



