June, 1913] AlDRICH : NORTH AMERICAN SpECIES OF LiSPA. 143 



about the middle, and generally a single bristle in place of the inner row. 

 Abdomen cinereous, with a pair of shining black spots on each of the first 

 four segments, the first pair small and indistinct ; the median cinereous line 

 is of the same color and texture as the rest of the cinereous surface (in 

 uliginosa generally delicate and indistinct) ; fourth segment from a third to a 

 half the length of the third ; fiffh segment rounded, with an inverted V-shaped 

 notch below. Wings of ordinary structure. Length, 5 mm. 



Female. — Head and front wider, the proportion about 2.51 ; hind femora 

 below with only one bristle. Length 6 mm. 



Eleven specimens of both sexes, six of them from the typical 

 material determined by Stein; South Dakota; Louisiana and Georgia 

 (Hough) ; Redwood City and Lake Elsinore, Cal. ; Winnemucca and 

 Pyramid Lakes, Nev. ; Roswell, Ida.; Havana, Cuba (C. F. Baker). 

 One male has on the hind femur four bristles in the outer row below 

 and three in the inner. 



The species is most related to uliginosa, from which it differs in 

 the number of dorso-central bristles, and in the J* by having a shorter 

 abdomen, fewer and more delicate hairs on the sides of the face, 

 dorsum more distinctly striped, narrower face, and fewer bristles on 

 lower side of hind femora. 



Lispa uliginosa Fallen. 



Male. — Head 2.80 times as wide as front, the latter wide above, narrowing 

 appreciably toward the antennae, with the usual long, narrow frontal trian- 

 gle ; margins a little silvery below the middle; compound eyes with a dis- 

 tinct area of enlarged facets about the level of the antennae ; antennae of 

 usual form, black, the second joint with a transverse yellow band at tip, which 

 looks whitish in certain lights ; face including its sides and the anterior part 

 of the cheeks yellowish-gray, with a somewhat silvery reflection ; sides of 

 face with a few hairs extending up to the front, at the level of the vibrissae 

 these are quite strong ; palpi pale yellow, gradually enlarged almost -from the 

 base, not very wide in the widest place — hardly half as wide as the length of 

 the third antennal joint — with a rounded bare spot in the widest place, else- 

 where with coarse black hairs. Thorax only moderately pollinose, half- 

 shining, with strong bristles arranged as usual ; halteres yellow, calypters 

 white with pale yellowish border. Legs black, except extreme apices of the 

 femora and all the tibiae, which are yellow ; tarsi entirely black ; middle tibia 

 with a long bristle on the front side well below the middle, and a small one 

 on the hind side at the middle ; hind tibia .98 times the length of its tarsus, 

 with one bristle on the outer front side below the middle, and a row on the 

 outer hind side, of which the one at the middle is largest ; hind femora with 

 two rows of stiff, rather short bristles below, and the usual strong row above. 

 Abdomen long and almost cylindrical, the fourth segment hardly half as long 



