AKT. 2 iSTEW UNDESCRIBED CKAlSrE FLIES ALEXANDER 11 



Idaho : Sandpoint, July 3, 1917 (H. G. Dyar) ; Lake Pend Oreille, 

 July 4, 1917 (H. G. Dyar). 



Montana : Glacier Park Station, altitude 4,800 feet, July 24, (J. M. 

 Aldrich). 



Alberta: Banff, July 10, 1918 (H. G. Dyar). 



The species is told by the four usually distinct praescutal stripes. 

 The male hypopygium has the outer dististyle unusually short and 

 stout, strongly arcuated, blackened on the distal half, the apical spine 

 relatively short, both the upper and lower faces of the style roughened 

 but more especially the outer or convex face where the spines are 

 large and conspicuous but strongly appressed. Inner dististyle short 

 and stout, the apex blunt. Aedeagus terminating in two small par- 

 allel rods, subtended on either side by very broad flattened plates. 

 Lateral process slender, carinate, the apex with microscopic denticles 

 and roughenings. 



LIMNOPHILA (EPHELIA) ALDRICHI, new species 



General coloration dark brownish gray, the praescutum with four 

 slightly darker brown stripes ; halteres light yellow ; femora and 

 tibiae yellowish, the tips darkened; wings subhyaline, with a heavy 

 brown pattern that is restricted to the vicinity of the veins; male 

 hypopygium with the outer dististyle bearing a small triangular 

 wing on outer margin at near two-thirds the length. 



Male. — Length about 5.8-6.4 mm. ; wing, 7.5-7.8 mm. 



Female. — ^Length about 7 mm. ; wing, 8.5 mm. 



Rostrum and palpi dark. Antennae with the scapal segments 

 dark; basal segments of the flagellum yellow, the outer segments 

 passing into brown. Head brownish gray. 



Mesonotal praescutum dark brownish gray with four slightly 

 darker brown stripes, the intermediate pair narrowly separated from 

 one another; pseudosutural foveae conspicuous, subcircular, black; 

 remainder of mesonotum dark, heavily pruinose. Pleura dark brown, 

 scarcely variegated with brighter, Halteres light yellow. Legs 

 with the coxae brownish yellow, the middle coxae darker brown; 

 trochanters obscure yellow; femora yellow, the tips rather broadly 

 but not abruptly infuscated; tibiae yellow, the tips narrowly in- 

 fuscated; tarsal segments obscure yellow, their tips narrowly dark- 

 ened, the terminal tarsal segments uniformly darkened. Wings 

 subhyaline, with a heavy brown pattern, as in the group; a series 

 of seven costal marks, the third at the origin of Rs^ the fifth, largest, 

 at the stigma, the sixth and seventh at the ends of veins R^ and R^ ; 

 conspicuous brown seams along the cord and outer end of cell -first 

 M^; a broad seam on the supernumerary crossvein in cell M ; a 

 cloud at the fork of M^^^\ marginal clouds on all the longitudinal 

 veins caudad of jff^+g, becoming larger posteriorly, that at the second 



