OSTEN SACKEN ON WESTEKN DIPTEKA. 31S 



greenish-black stripe on the outside ; tarsi iufa seated from the tip of the 

 first joint; hind tibite slightly incrassated, on the inner side glabrous, and 

 with a longitudinal furrow, the bo ttom of which is brownish. Wings 

 grayish, slightly tinged with yellowish anteriorly, except the costal cell, 

 which is subhyaline ; costa with a stout swelling at the tip of the first 

 vein; the posterior margin deeply indented at the end of the fourth vein. 



Female. — The antennie are a little smaller and less hairy, although 

 they have the same structure and coloring ; the face is broader ; the hind 

 tibine are not incrassate and not glabrous on the inner side; the costa is 

 without sw elling; the indentation of the posterior alar margin is pres- 

 ent. Length G-T™"^. 



Hal). — Los Guilucos, Sonoma County, California, July 5. Two males 

 and one female. 



2. Hygeoceleuthus afflictus n. sp. — Male. — Similar in all re- 

 spects to the preceding species, except that the antennae are not much 

 larger and not much more hairy than those of an ordinary BoUcliojms ; 

 the first joint has the same yellow expansion on the inner side ; the sec- 

 ond joint is much smaller, and has only a vestige of yellow on the inner 

 side; the pubescence of the arista is so fine as to require a much 

 stronger magnifying power; the face is silvery- white ; the cilia of the 

 inferior orbit almost white; lamellae of the hypopygium whitish. The 

 hind tibiie of the male have the same structure, only they are a little 

 more incrassated and the shallow groove on their inside is broader and 

 more distinctly tinged with brown ; on each side of the second abdom- 

 inal segment, there is a tuft of long yellow hair, which does not exist 

 in my specimens of E. crenatus; the wings are the same as in the latter 

 species. Length 6-7™°^. 



Sab. — San Rafael, Cal., May 19. A single male. 



Observation. — Dolichopus lamellicornis Thomson, Eugenics Resa, etc., 

 511, 114 (a female), judging from the description of the antennae, 

 must be a Hygroceleuthus. The description does not agree with my 

 female of E. crenatus; but it may be the female of S. afflictus, which I 

 do not possess. All the characteristic marks of the species do not, of 

 course, exist in the female, which the author describes ; but he does not 

 even mention the indentation on the hind margin of the wing, which 

 in E. crenatus at least exists in both sexes ; and, if the same is the case 

 with the unknown female of E. afflictus, this would exclude the synon- 

 ymy of Mr. Thomson's species. 



DOLICHOPUS. 



The three species of Dolichopus before me, after comparison with the 

 analytical table of the Eastern American species, in the Monographs, 

 etc., vol. ii, 323, may be tabulated as follows: — 



I. Prevailing color of the legs black ; cilia of the inferior orbit black : 

 ] . corax n. sp. 



