592 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Rostrum and palpi brown. Antennae with the basal segment 

 very elongate, dark brown, flagellum dark brown. Head gray. 



Thoracic dorsum light gray, the prsescutum with darker markings, 

 a very indistinct stripe on either side of the middle line, a more 

 distinct stripe on either side, narrowest in front. Pleurae light gray. 

 Halteres pale yellow. Legs, coxse and trochanters yellow, femora 

 yellow darkened at the tip, tibiae brownish yellow, brown at the tip, 

 tarsi brown. Wings subhyaline or faintly yellowish, stigma indis- 

 stint, veins brown; venation (PI. XXVII, fig. 29) : 7^2+3 about as long 

 as the basal deflection of Cih; cross-vein /• at about two-thirds the 

 length of Ri- 



Abdominal tergites gray, the hypopygium reddish yellow; ster- 

 nites blackish gray, each segment with more or less yellow at the 

 base. 



Holotype, cf , London Hill Mine, Bear Lake, Brit. Col., alt. 7,000 

 feet, July 29, 1903 (A. N. Caudell). 



Allotype, 9 , topotypic. 



Paratypes, 10 cf 9 , topotypic. 



In the U. S. National Museum Collection this material was deter- 

 mined as L. cuhitalis Osten Sacken, and by Osten Sacken's key* it 

 would run down to that species. The following differences suffice to 

 separate the forms: 



1. The extreme base of R2 is perpendicular to the end of the sector; 

 cell R2 very long and narrow; wings more tinged with yellow; 

 hypopygium concolorous with the rest of the abdomen; size 



larger (Eastern United States) cuhitalis Osten Sacken. 



Ri leaves the end of the sector at an angle; cell Ri shorter, not so 

 elongated; wings nearly hyaline; hypopygium reddish, con- 

 spicuously brighter than the rest of the abdomen; size smaller 

 (British Columbia) hortensia, sp. n. 



Limnophila nigripleura A. and L. sp. n. 



Belongs to the luteipennis Osten Sacken group; wings clear; 

 pleurae with a conspicuous dark brown stripe from the cervical 

 sclerites to the postnotum. 



Male, length, 4.8-5 mm.; wing, 5.8-6 mm. 



Female, length, 6 mm.; wing 7 mm. 



Palpi and antennie dark brownish black. Head light clear gray, 

 provided with nunu^rous hairs. 



Pronotum dusted with gray. Mesonotal praescutum and scutum 



^Mon. Dipt. N. Am., vol.4, pp. 202, 203. 



