CHARLES P. ALEXANDER 7 



Mesonotum very gibbous, brownish with a very broad brown median stripe 

 and shorter, less distinct stripes on the sides of the praescutum; scutum 

 with the lobes gray, the middle area brownish; scutellum and postnotum 

 grayish. Pleura light brown with a sparse gray bloom, deepest and brightest 

 on the sclerites just in front of the base of the halteres. Halteres short, the 

 stem pale, knob brown. Legs with the coxae and trochanters dull yellow, 

 femora pale brown, a little darkened at the tips, tibiae and tarsi dark bro-wn. 

 Wings hyaline, the stigma present or absent, varying from subhyaUne to a 

 dark brown, in shape full and rounded. Venation: Sc short, ending far before 

 the origin of Rs ; Sci about five times as long as Sc2 ; Rn short, about equal in 

 length to the basal deflection of R 4+5- 



Abdomen dark brown with a sparse gray bloom. 



Habitat. — Peru. Holotype, cf, Lima, Peru, altitude 500 

 feet, August 19, 1914. (Parish coll.) Allotype, 9 , topotypic, 

 August 11, 1914. Paratypes, 20 cf, 9, topotypic, August 3 

 to 30, 1914; Matucana, Peru, altitude 7788 feet, one d^, July 

 14, 1914. (Parish coll.) 



This insect agrees most closely with D. vernalis Philippi "^ 

 (Chile), which is a larger species having the stigmal spot of a 

 different shape and the abdomen of a very distinct pattern. 

 In the shortness of the radial sector D. gibbera suggests D. 

 omissa Alexander* which has the cell 1st Mo open. 



Dicranomyia invalida sp. n. 



Antennae dark brown ; thorax gray with darker stripes ; wings with a bro^sTi 

 blotch at the fork of Rs; abdomen dark gray, the hypopygium yellowish. 



Male. — Length, 5.5 mm.; wing, 8.5 mm. 



Female. — Length, 5.8 to 6.3 mm.; wing, 8.9 to 9.6 mm. 



Rostrum dull yellowish brown, palpi dark brown. Antennae dark brown, 

 the flagellar segments subrounded to oval. Head light gray. 



Thoracic dorsum dull grayish yellow with brownish stripes, the median one 

 broad, divided by a very narrow, pale median line, lateral stripes short, behind 

 becoming confluent with the middle stripe; scutum, scutellum and postnotum 

 Ught gray. Pleura gray. Halteres pale, the knob darker. Legs with the 

 coxae dull yellow with a pale greenish tinge, trochanters pale, femora pale 

 yellowish brown, a little darkened toward the tip, tibiae and tarsi brovATi. 

 Wings whitish subhyaline, stigma subquadrate, brown; an oval mark at the 

 fork of Rs connected with the stigma; seaming along the cord and outer deflec- 

 tion of cell 1st Mo very narrow antl indistinct. Venation: (see plate I, fig.4) 

 Sc rather short, ending about opposite the origin of Rs; Sc-i about one-fifth 



^ 1865. vernalis Philippi, Vcrli. k.-k. zool.-])ot. Ges. Wien, xv, p. 612 {Simno- 

 bia). 



^ 1912. omissa Alexander, Can. Ent., xliv, j). 340, pi. XI, fig. o (Fur- 

 coynyia) . 



TRANS. AM. ENT. SOC, XLII. 



