TAXONOMY OF MUSCOIDEAN FLIES — TOWNSEND 1 25 



These specimens are more hairy, more bristly on thorax and scu- 

 tellum, and on peristomalia. They also usually show less silvery 

 on face and parafacials, and the antennas are quite black. Palpi 

 black. The Kukak Bay and Kadiak specimens show no silvery on 

 the soft blackish facial plate, and the parafacials are tan-colored 

 without a sign of silvery. The other two specimens show some 

 silvery, not only on facial plate, but also on the more or less tan- 

 colored parafacials. 



Type.— Cat. No. 10,897, U. S. N. M. (Kukak Bay, Alaska). 



The two Washington State and two British Columbia specimens 

 mentioned under latreillei are certainly distinctly to be referred to 

 that species, which is the eastern form, and which is thus seen to 

 range from the Atlantic to the Pacific. Humes, alascensis doubtless 

 represents rather a boreal form. 



Family PHASHM) 



Tribe Anurogynini 



Genus Hyalomyodes Townsend 



Hyalomyodes weedii Townsend. — This species seems distinct 

 from Hyalomyia triangulifera H. Loew, but needs further study. 

 The writer has examined the type of the latter in Cambridge. 



Hyalomyodes triangulifera H. Loew. — Ten specimens from the 

 White Mountains of New Hampshire, one from Massachusetts, and 

 one from Maryland agree perfectly with the description of H. weedii 

 Townsend. They also agree with Loew's description, but an exam- 

 ination of the type in Cambridge seemed to indicate differences. 

 The front, frontalia, and parafacials are wider in the male, and the 

 claws are elongate. Humeri grayish. 



Hyalomyodes robusta, sp. nov. 



Two males, North Fork of Rio Ruidoso, White Mountains, New 

 Mexico, about 8,200 feet, on flowers of Solidago trincrvata, August 

 17, Townsend. 



Differs from triangulifera in being more robust, and first abdom- 

 inal segment with pollinose fascia same as second and third. The 

 thorax is also more conspicuously pollinose. Hind crossvein quite 

 straight, in one specimen much nearer to small crossvein than to 

 bend of fourth vein, in both distinctly nearer. The pollen of median 

 portion of thorax and abdomen has a brassy tinge, that on sides 

 being silvery-whitish. Macrochsetae not so well developed, consid- 

 erably weaker. Parafacials wide in both specimens. Length, 5 mm. 



Type.— Cat. No. 11,651, U. S. N. M. 



