10 PROCEEDINGS OF THE NATIONAL MUSEUM vou 72 



Dicranomyia negligens is most closely allied to D. nelliana 

 Alexander,^ likewise from Colorado. The wing-pattern is much 

 more restricted in the present species and /Sc is slightly longer. 

 Both species bear a great resemblance to members of the simulans 

 group of the genus Lmionia. 



DICRANOPTYCHA GCCIDENTALIS, new species 



Generally similar to D. sohr-'ma Osten Sacken; costal fringe of 

 male short; male hypopygium with the terminal spine of the outer 

 dististyle long and straight. 



Male. — Length about 8 mm. ; wing, 9 mm. 



Rostrum dark gray, the palpi brownish black. Antennae with 

 the scapal segments yellow, the flagellum dark brown, with long 

 verticils. Head brownish, gray. 



Mesonotum dark gray, the praescutum with a scarcely indicated 

 darker gray median area, the surface of the disk with a sparse 

 yellow pollen, the lateral margins clearer gray. Pleura gray. 

 Halteres pale, the knobs weakly infuscated. Legs with the coxae 

 brownish yellow; trochanters yellow; remainder of legs brownish 

 yellow, the tips of the femora and tibiae a little darkened ; terminal 

 tarsal segments dark brown. Wings with the costal fringe (male) 

 short, the membrane strongly suffused with yellowish; Rs and cell 

 ■first M^ relatively short. 



Abdomen generally dark brown, the subterminal segments some- 

 what darker. Male hypopygium about as in D. quadrivittata 

 Alexander, but the outer dististyle longer and more slender, with 

 the terminal spine long and straight, the spines on the outer face 

 of the style more erect and conspicuous. Inner dististyle with the 

 tip broadly rounded. Aedeagus blunt, not terminating in two rods, 

 the subtending plates less broadly flattened apically. Lateral 

 processes slender, each terminating in a more chitinized beak, without 

 apical denticles. 



Habitat. — California. Holotype., male, Alpine, April 10, 1915 (M. 

 C. Van Duzee). Paratypes., a broken male, Muir Woods, Marin Co., 

 May 19, 1915 (M. C. Van Duzee) ; a broken male Berkeley, May 14, 

 1915 (M. C. Van Duzee). The type is preserved in the writer's col- 

 lection, through the kindness of Mr. M. C. Van Duzee. 



The species mentioned above as Dicranoptycha quadrimttata Alex- 

 ander was first described ^ as a variety of sobrina Osten Sacken, 

 but is now known to be amply distinct. It has the following distri- 

 bution, as known : 



Colorado: Peaceful Valley, August 25, 1917 (Cockerell) ; type. 



sProc. Acad. Nat. Sci. PMladelpWa, 1914, pp. 579-580, pi. 27, flg. 22. 

 6 Can. Ent, vol. 51, p. 191, 1919. 



