June, 1913] AlDRICH: NoRTH AMERICAN SpECIES OF LiSPA. 136 



I sent some of this material to Mr. Theodor Becker, Liegnitz, 

 Prussia, in 1908, as he had recently oublished a revision of the palae- 

 arctic species of Lispa; he informed me that he could not distinguish 

 this species from one which he had described as L. cinifera, from 

 Siberia. Since then I have referred it to that species until very 

 lately, when I have come to the conclusion that it is different. 

 Cinifera is known in only a single ^ specimen, not very well pre- 

 served, and a complete comparison cannot be made. The description 

 of cinifera states that the hind metatarsus is longer than all four of 

 the following joints, a rather striking character which does not apply 

 to salina; the long pile of the under side of the hind femur is not 

 mentioned in the description of cinifera, but is conspicuous in salina. 

 These with some slighter discrepancies, together with the wide dif- 

 ference of locality, lead me to believe that it would be dangerous to 

 accept the view that cinifera includes our American form. 



This is a very characteristic fly of the shores of the denser salt 

 and alkaline lakes of the West. Although I did not find the larvae, 

 they will probably be found under the beach refuse, which in the case 

 of Great Salt Lake consists almost entirely of the puparia of Ephydra 

 gracilis Pack. 



Lispa spinipes new species. 



A smallish gray species with narrow front and face, the short 4th joint 

 of the middle tarsus in the ^ ending in a long slender appressed spine, which 

 reaches to the tip of the slender 5th joint. 



Male. — Front much narrower than either eye (the head z-^^ times its 

 width), hardly narrowed toward the antennae; face narrow, especially the 

 sides, which have only a single row of small hairs, none above the middle ; 

 the whole face pale yellow, more whitish at the edges ; vibrissae very small ; 

 antennae wholly black, of ordinary form ; palpi yellow, of moderate size for 

 the genus and widening to the apical part with about the usual suddenness, 

 with a few black hairs except on the middle of the dilated part. 



Thorax wholly gray, with the usual chsetotaxy ; halteres yellow with 

 brownish knob,- calypters white with faint yellow margin. 



Abdomen gray, no median stripe, sides of second and third segments very 

 faintly darker behind, fourth segment changing to yellowish ; fifth segment 

 black, almost all the dorsal half pure white; hypopygium inconspicuous, black. 



Legs uniformly gray except the knees and a little of the base of each 

 tibia, which are yellowish red ; pulvilli rather small, brownish ; front tibiae 

 with only subapical bristles, their tarsi longer than the tibiae ; middle femora 

 slender toward tip ; middle tibiae with two smallish bristles just beyond the 

 middle; middle tarsi considerably shorter than their tibiae, the second, third and 



