198 BULLETIN UNITED STATES GEOLOGICAL SUKVEY. 



genus require a closer study than I have been .able to give them in pre- 

 paring my Monograph. A male specimen from Lake Tahoe, July 19, is 

 much paler in coloring, and may be a different species. 



Elliptera claijsa n. sp.— This is an interesting discovery, as the 

 genus Mliptera (compare Monogr., iv, p. 122, tab. i, f. 10), represented 

 by a single species in Europe, had not been found in America before. 

 The venation is like that represented on the above quoted figure, only the 

 first longitudinal vein is a little shorter, so that the segment of the mar- 

 gin between its tip and the tip of the second vein is much longer than 

 the segment between the second and third veins (and not shorter, as 

 the figure has it ) ; the discal cell is closed. But the characteristic mark 

 of Ulliptera, the close proximity between the first and second veins, 

 exists also in this new species. Elliptera has no empodia and no vest- 

 ige of a marginal cross- vein. The forceps of the male, which I observed 

 in life, resembles that of an ordinary LinmopMla, and not at all that of 

 a Dicranomyia. 



Male and female. — Antennae and palpi'black ; front grayish-pruinose ; 

 thorax grayish-pruinose ; three distinct broad brown stripes on the 

 dorsum; halteres brown, their root yellow; abdomen grayish-brown; 

 legs brown ; coxoe and root of the femora, especially of the front pair, 

 yellowish ; wings subhyaline, slightly tinged with grayish ; stigma 

 oval, brown. 



Hah. — Yosemite Valley, Cal. I found umerous specimens on the wet 

 mos, in the spray of the Yernal Fall, June 11. I have now four males 

 and two females before me. 



Section III. — Eriopterina. 

 Erioptera dulcis n. sp. — The prcefurca ends in the second sub- 

 marginal cell ; discal cell closed ; inner end of third posterior cell much 

 nearer to the root of the wing than the inner end of second posterior; 

 wings pale brownish, with a number of white spots, especially along 

 the margin and on the cross-veins ; femora with a dark brown ring before 

 the tip. Length about 3™°^. 



Thorax yellowish, with brown lines on dorsum and pleurse; abdomen 

 brownish, halteres with a brown knob; wings pale brown, with numer- 

 ous white spots, one at the extreme proximal end of the basal cells, 

 with a smaller spot, alongside of it, near the costa; a large square spot 

 between the costa and the fourth vein, covering the origin of the 

 prsefurca; a similar spot between the costa and the middle of the 

 preefurca; an oblong spot near the end of the prsefurca; another one 

 between the end of the auxiliary vein and the second submarginal cell ; 

 rounded spots along the whole margin at the end of all veins except 

 the third ; often one or two spots in the middle of the posterior branch 

 of the second vein ; the distal end of the four posterior cells likewise 

 spotted. Legs pale yellow, a ring before the end of the femora and the 

 tip of the tibiae dark brown. 

 Rah. — Lake Tahoe, Sierra Nevada, California, July 19. Six males. 



