210 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



rupted dorsal stripe brown. On the venter, the anterior half of the 

 second segment is dark brown, shining; a narrow brown shining cross- 

 band at the base of the three following segments (broader in the female). 

 Terminal club of the abdomen in the male of moderate size, brownish- 

 yellow, with two very small, yellowish, projecting, coriaceous organs 

 above ; in the female, the three last joints of the abdomen are shining ; 

 the upper valves are almost rounded at tip; the lower ones shorter and 

 pointed. Legs yellowish-brown; tips of femora dark brown. Wings 

 grayish, a gray cloud at the distal end of the first basal cell, other clouds 

 about the middle of the anal cell and at the tip of the seventh vein ; 

 longitudinal faint gray shades along the middle of all the cells in the 

 apical portion of the wing, including the axillary ; stigma oval, blackish. 



Sab. — Marin and Sonoma Counties, in April and May, rather com- 

 mon. Will be easily distinguished by the peculiar coloring of the pos. 

 terior part of the thorax. 



Tipula spernax n. sp., 9 . — Thorax shining black, smooth, polished ; 

 metanctum with a stripe of gray pollen in the middle ; wings grayish- 

 hyaline, unicolorous. Length, including ovipositor, about 16 mm . 



Female. — Head, including rostrum, black, shining; a gray pollen on 

 the front and on the upper part of the rostrum ; palpi black ; antennas 

 black, but little longer than the head ; joints of the flagellum hardly 

 incrassate at base, with moderate verticils; first joint grayish-pollinose. 

 Thoracic dorsum shining, black, smooth; pleurae and coxse grayish-polli- 

 nose, a yellowish stripe between the root of the wings and the collare ; the 

 space between the root of the wings and the scutellum and metanotum 

 is likewise yellowish ; metanotum black, with a stripe of gray pollen in 

 the middle, its sides yellowish ; halteres yellowish-brown ; abdomen 

 black, shining, slightly grayish-pruinose toward the tip; each seg- 

 ment with a narrow yellow border posteriorly and yellow lateral mar- 

 gins ; legs dark brown ; femora, except the tip, reddish. Valves of the 

 ovipositor yellowish-ferruginous, the upper ones very narrow, almost 

 linear ; tip slightly incrassate, brown. Wings uniformly grayish-hyaline- 

 stigma brown, a whitish spot at its proximal end; veins brown, except 

 those of the root, which is yellow, with a dark brown spot immediately 

 above the insertion. 



Eab. — Webber Lake, Sierra Nevada, July 26. A single female. 



A very remarkable species, allied to Pachyrrhina. Without having 

 the male, it is difficult to ascertain its relationship. 



Pachyrrhina altissima n. sp., $ 9 . — Altogether black, including 

 legs and halteres ; wings brownish, with a small brown stigma. Length, 

 $ 12-13 mm ; 9 15-16 mm . 



Male. — Antennas about as long as head and thorax together, nodose, 

 verticillate ; thorax somewhat shining, slightly grayish-pollinose ; abdo; 

 men moderately shining, with velvet-black, opaque cross-bands on the 

 segments 2-4; second posterior cell sessile' or subsessile ; appendages of 

 hypopygium dark brown or black. 



