THE CANADIAN ENTOMOLOGIST 207 



3. Antennae with 12 segments; all the femora of the male incrass- 

 ated; size larger, (length of the male about 6 mm.; diam- 

 eter across the thorax 1.5 mm.) primitiva, sp. n. 



Antennae with 7 segments; the hind femora of the male 

 conspicuously incrassated; size smaller (length of the male 

 about 5 mm.; diameter across the thorax about 

 1 mm.) valga Harris 



Tribe Limnophilini. 

 Genus Limnophila Macquart. 



Limnophila subaptera, sp. n. 



Subapterous; wing of the male longer than the halter. 



Male. — Length about 12 mm.; wing 2.5 mm. 



Rostrum and palpi dark brown. Antennae dark brown, ap- 

 parently with only 15 segments; segments of the flagellum short- 

 oval with stout, black bristles and a sparse, white pubescence. 

 Head grayish with scattered yellowish bristles. 



Thoracic dorsum grayish with three indistinct grayish brown 

 stripes, the lateral pair running back on to the scutum; sides of 

 the scutellum yellowish. Pleura gray, the dorso-pleural mem- 

 branes brownish yellow. Halteres brown, paler basally. Legs 

 long and slender; outer faces of the cox£e grayish except the fore 

 coxffi which are pale yellow; femora pale at the extreme base, the 

 remainder dark brown; tibiae brownish yellow, the apices darker 

 brown; tarsi brown. Wings subatrophied, long and narow, 

 longer than the halteres (fig. 8), pale basally, darker brown apically. 



Abdomen long and slender, brownish gray, the segments 

 narrowly and indistinctly margined with paler; hypopygium with 

 golden-yellow hairs. 



Holotype, cf , South Fork of the Kaweah R., California, below 

 5,000 feet, July 25, 1915, (J. Chester Bradley). 



Type in the collection of Cornell University. 



Similar to L. aspidoptera Coquillett (New Mexico) and like 

 this species having apparently but 15 antennal segments, the re- 

 duction being brought about by the fusion or very close approxi- 

 mation of the last two segments ; the three basal antennal segments 

 in aspidoptera are the more brightly coloured. The most obvious 

 difference is in the elongate wings of the present species, these 



