CHARLES P. ALEXANDER 19 



Pronotum dark brown, whitish laterally. Mesonotal praescutum dark 

 brown, thinly dusted with gray, the pseudosutural foveae very prominent, 

 elongate; scutum light gray; scutellum very pale grayish white; postnotum 

 grayish medially, In-oadly and abruptly whitish on the sides. Tleura brownish 

 gray with a very broad white band extending from behind the fore coxa to the 

 base of the abdomen. Halteres brownish. Legs with the coxae ])rownish, 

 more 3-ellow at the base; trochanters dull yellow; femora dull yellow, a little 

 darkened at the tip; tibiae dull yellow, the tip narrowly brown; tarsi brown. 

 Wings light gray to brownish subhyaline, usually with distinct brown clouds 

 as follows: stigmal, base of Rs, along the cord, cross-vein 7)1, middle of cell M, 

 above the tip of Snd A. Venation: (see plate II, figs. 9, 10) Sc varying in 

 length, the distance beyond the base of Rs sometimes one-half the length of 

 Rs, at other times onlj^ about one-quarter of this length. 



Abdominal tergites yellowish brown; sternites dull Ijrownish yellow. 



Habitat. — Feru. Holotype, cf, Matucana, Peru, altitude 

 7f00 feet, April 22, 1913 (C. H. T. Townsend coll.). Allotype, 

 9, topotypic, altitude 7788 feet, June 14, 1914 (Parish coll.). 

 Paratypes, 2cf , 19, topotypic, same data as for the allotype but 

 taken June 15, 1914. 



This species agrees quite closely with Go7iomyia (Gonomyia) 

 slossonae Alexander -'' but the gray head, different thoracic color- 

 ation and the spotted wings will serve to separate the two forms. 



Genus MOLOPHILUS Curtis 

 Molophilus capricornis sp. n. 



Color medium brown; antennae short; wings with a brown blotch at the 

 cord; ventral pleural appendage of the male hypopygium almost straight, 

 pointed at its tip, the inner margin with obscure teeth. 



Male. — Length, 4.2 mm.; wing, 5.1 mm. 



Female. — Length, 3.9-4 mm.; wing, 4.3 mm. 



Rostrum and palpi dark brownish black. Antennae short, the segments oval, 

 clothed with long, pale hairs, the organ l^lack throughout. Head dark col- 

 ored with a gray bloom. 



Mesonotal praescutum light Ijrown; a row of hairs on either side, just inside 

 the proximal end of the pseudosutural foveae; the region anterior to the pseu- 

 dosutural foveae is light yellow; ends of the pronotal scutellum light shiny 

 yellow. Pleura plumbeous. Halteres i)ale, the elongate knob only a little 

 darker. Legs with the coxae light yellowish lirown ; trochanters light brown; 

 remainder of the legs dark brown, ^^■ings light brown, a darker coloration 

 amounting to a spot in the vicinity of the cord and caused by the abundance 

 of hairs at that place, ^'enation as in plate I, fig. 9. 



Abdomen dark brown. Male hypopygium with the ventral pUnual append- 

 age (see plate IV, fig. 3) heavily chitinizcd, almost straight, or the tij) directed 



" Proc. Acad. Nat. Sci. Phila., 1914, p. 588, pi. XXVII, fig. 26. 



TRANS. AM. ENT. SOC, XLII. 



