OSTEN SACKEN ON WESTERN DIPTERA. 197 



Dicranomyia marmorata Osten Sacken, Monogr., iv, p. 77. — A 

 California!! species. I found a male and a female near Saucelito, Cal., 

 April 2. In the live insect, I noticed a peculiarity, which I had over- 

 looked in the dry ones, from which I drew my description. The an- 

 tennae are distinctly submoniliform, the nearly globular joints being- 

 separated by very short pedicels. In my description, the words " re- 

 lated to humidicola O. S." better be struck out. 



Dicranomyia n. sp. — Seems common in Marin County, California, 

 in April. In looking for it on my analytical table (1. c, p. 61,) D. liberta 

 and hceretica would be reached; it is neither of them, but a new species, 

 which I leave to others to describe, as my specimens are not well pre- 

 served enough for that purpose. The structure of the male forceps will 

 have to be observed in the live specimens. 



Limnobta sciophila n. sp. — Marginal cross vein some distance back 

 of the tip of the first longitudinal vein ; femora with three brown rings; 

 wings with grayish clouds and intervening subhyaline spaces in all the 

 cells; length 10-ll mm . 



Eostrum, palpi, and antennae brown, the latter with long verticils: 

 thoracic dorsum with three brown stripes, the intervening spaces, 

 shoulders, middle of the mesonotum, etc., grayish-pruinose ; abdo- 

 men brown, incisures paler; genitals yellowish-brown; halteres with 

 brown knobs; femora pale yellow, with three brown rings on the 

 distal half, the last of them very near the tip ; tibiae and tarsi yellow- 

 ish-brown. "Wings with a faint yellowish tinge as a ground-color; 

 grayish clouds of irregular shape occupy all the cells, and become almost 

 confluent on the distal half of the wing, leaving only small spaces of 

 the ground-color at both ends of the cells; in four or five places along 

 the first vein, the clouds are darker, so as to have the appearance of 

 brown spots; the marginal cross- vein is in the middle of the stigma, 

 and some distance back of the tip of the first vein. 



Hob. — Marin and Sonoma Counties, California, in the spring; com- 

 mon, especially in dark, deep gulches, with running water at the bottom 

 (Menlo Park, March 25; San Eafaei, April, May; Geysers, Sonoma 

 County, May). Three males and four females. 



Very closely allied to the European L. nubeculosa. 



Limnobta californica Osten Sacken, Monogr., iv, p. 96.— California. 



Section II. — Limnobina anomala. 



Dicranoptycha sobrina Osten Sacken, Monogr., iv, p. 118.— A spe- 

 cies very similar to this eastern one, and perhaps identical with it, occurs 

 quite commonly in Marin aDd Sonoma Counties, California. The two 

 basal joints of the brown antennae are yellow and the fringe of hairs 

 on the anterior margin of the wings in the male is not very long and 

 conspicuous ; in both respects, these specimens are more like the form 

 j which I called D. sororcula in my former essay, and which later I gave 

 up as a species, perhaps erroneously. The specific characters in this 



