June, I9I3-1 AlDRICH : NoRTH AMERICAN SpECIES OF LiSPA. 137 



fourth joints all short, the fourth ending in a spine which continues along 

 the fifth joint to the claws; fifth joint attached to the fourth at one side 

 before the tip, much longer and more slender than u^ual. Hind tibise with a 

 row of small bristles down the hind side, one of which beyond the middle is 

 of uncommon length. All the femora are rather slender. Hind tibiae 1.70 

 times as long as their tarsi. 



Wings of ordinary structure, hind crossvein not much more than half its 

 length from the margin, straight and moderately inclined. Length 5.5 mm. ; 

 of wing 3.8 mm. 



One J*, collected by me at Lake Elsinore, California, on August 2, 

 191 1. One J*, one 5, Lewiston, Ida., Aug. 2, 1912. The female is 

 rather teneral and the head and front width cannot be accurately 

 determined ; the front is evidently narrow however. The middle tarsi 

 are of simple structure. 



Lake Elsinore is a moderately alkaline body of water; but spinipcs 

 it appears is found also in fresh water, as at Lewiston, Idaho; in this 

 respect it is unlike sordida, salina and antcnnata, which have been 

 found so far only at alkaline or salt water. 



Lispa brevipes new species. 



Male. — Eyes nearest together at the level of the antennae, where they are 

 separated by considerably less than the width of one eye (head 2.9 times the 

 width of the front) ; front blackish anteriorly, brown above, the acuminate 

 brown ocellar triangle indistinct toward the antennae ; frontal orbits with long 

 hairs between and outside the bristles ; a heavy black band connects the eyes 

 across the base of the antennae, slightly up-turned at the eyes, just as in 

 palposa ; antennae velvety black on first two joints, the second not with paler 

 apical margin, third joint as usual; sides of face silvery, without hairs except 

 a few on lower part; middle of face brassy; vibrissae decidedly less developed 

 than in most species, with numerous hairs on the outer side of each ; palpi 

 brownish-yellow, not quite so large nor so suddenly dilated as in tentaculata, 

 moderately hairy. Thorax on the dorsum grayish, sub-shining, a paler 

 pruinose median stripe, which disappears posteriorly and has a faint brown 

 stripe upon it; the beginning of another gray stripe each side at the front end 

 of the dorsocentral rows ; humeri gray ; chaetotaxy normal ; halteres with 

 brown knob, calypter ivory-white with yellow border ; wings normal. Ab- 

 domen rather flat and wide, the first four segments almost uniform light-gray 

 dusted, fifth segment black, with a conspicuous chalk-white, almost silvery 

 triangular median dorsal spot ; fourth segment with discal and apical row of 

 bristles ; venter unicolorous, a little darker than dorsum, fourth sternite with 

 a deep, rounded incision. Legs including the knees entirely black, with uni- 

 form gray pruinosity ; front tarsi of almost the length of their tibiae, the first 

 joint fully as long as all the rest ; middle tarsi about three fourths as long 

 as their tibiae, slender; hind tibia 1.47 times as long as its tarsus, the basal 



