528 PROCEEDINGS OF THE ACADEMY OF [Oct., 



into a slender cylindrical point, the outer or ventral margin with a 

 few sharp, appressed teeth. 



RHABDOMASTIX Skuse. 



Rhabdomastix Skuse; Proceedings of the Linnsean Society of New South Wales, 

 series 2, vol. 4, pp. 828, 829 (1889). 



Subgenus SACANDAGA Alexander. 

 Rhabdomastix (Sacandaga) monticola sp. n. 



Coloration grayish black; wings whitish hyaline with an indistinct 

 pale brown stigma; cross-vein r present but faint; cell R 2 small; cell 

 1st M 2 elongate with the basal deflection of Ciii inserted at about 

 mid-length. 



Male. — Length about 5.5 mm.; wing, 6 mm. 



Rostrum and palpi dark brownish black. Antennae black, the 

 flagellar segments with a long, pale pubescence; flagellar segments 

 narrowed, especially terminally. Head black with a sparse grayish 

 bloom. 



Mesonotum black with a sparse grayish yellow pollen; tuberculate 

 pits on the extreme cephalic margin of the sclerite. Pleura clearer 

 gray. Halteres pale, the knobs enlarged, the stem a little darkened 

 basally. Legs with the coxae black with a sparse gray bloom; tro- 

 chanters brown; femora dark brown; tibiae yellowish brown, a little 

 darkened at the base and more narrowly at the tips; tarsal seg- 

 ment one and all except the tip of two yellowish brown; remainder 

 of the tarsi dark brown. Wings subhyaline, the stigma fairly distinct, 

 oval, pale brown; veins dark brown, Sc paler. Venation (Plate 

 XXVII, fig. 41) with Rs elongate; cell R 2 small, vein ^ 2 being 

 short, oblique; R 3 arcuated; cross-vein r present but very indistinct, 

 bisecting the stigma; cell 1st M 2 rectangular, somewhat elongated, 

 the veins issuing from it not elongated, divergent; basal deflection 

 of Qui almost mid-length of cell 1st M 2 . 



Abdomen dark brownish black. 



Habitat. — Western America. 



Holotype, d% Kokanee Mountain, British Columbia, altitude 

 8,000 feet, August 11, 1903 (R. P. Currie). 



Paratopotypes, 3 cf's. 



Type in the collection of the United States National Museum. 



This species was formerly determined as being R. (S.) caudata 

 Lundbeck 9 in the first part of this series, but additional material 



9 Diptera groenlandica, Vidensk. Meddel. fra den naturh. Foren., p. 267, 

 PL 6, fig. 18 (1898); as a Goniomyia, subgenus Empeda. 



