440 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



cell, and the heavily ciliate liind tibiae. The genus is evidently 

 closely related to Trichopodopsis Townsend, from which it may be at 

 once distinguished by the broadly ovate and shortened abdomen of 

 both sexes, the broad hyaline inner margin of wings, and the shorter 

 legs, as weU as the broadly yellow wing bases in both sexes. The 

 petiole of apical cell is but little shorter than length of second antennal 

 joint, being always pronounced. In this character the genus resem- 

 bles Mormonomyia Brauer and Bergenstamm, but dififers therefrom 

 in other marked characters such as the form and venation of the 

 wings, although it agrees in the form of abdomen and the ciliate hind 

 tibiae. 



ECTOPHASIOPSIS CHILENSIS, new species. 



Length of body, 7 to 9 mm.; of wing, 5.5 to 7 mm. One female 

 and two males, Chile (E. C. Reed). 



Front and face silvery, with a yellowish tinge in some lights; 

 frontalia pale brown to blacldsh; antennae rufous, the third joint 

 usually black except base, the arista brown or blackish. Mesoscutum 

 silvery pollinose in both sexes, the disk with a brassy tinge and four 

 distinct black vittae reaching well behind suture, the outer ones 

 heavier and all interrupted. Scutellum blackish, somewhat silvery. 

 Abdomen of female broadly orange-yeUow on sides in an evenly 

 arcuate marking extending from front edge of first segment to hind 

 edge of third segment, the two nearly confluent on front margin of 

 second segment, the rest of abdomen black with a faint silvery sheen, 

 venter wholly yellow except tip; the male abdomen is normally 

 wholly yellow on venter including even the hypopygium, and en- 

 croachhig upon the dorsum in a broad border on sides and tip, the 

 rest being blackish with a faint silver sheen over all. In one male 

 the abdomen is wholly yellow, with only a brownish spot on middle 

 of fourth segment and the fourth and fifth segments more thickly 

 silvery pollinose. Legs black or brownish, the cilia of hind tibiae 

 glossy jet black. Wings of both sexes broadly flavous on base, 

 broadly hyaline on inner border, the intermediate portion black, 

 broad rays of milky white traversing the length of the wing in the 

 male but confined to the middle subcostal region of the wing in the 

 female. Tegulae fight golden yellowish, the front scale more or less 

 whitish externally. Pleurae thickly silvery. Claws fairly elongate 

 in female, strongly so in male. 



Holotype.— Cat. No. 19460, U.S.N.M. 



Trichopoda arcuata Bigot, ^ described from Chile, may possibly be 

 this species, but the description does not agree well with the present 

 specimens. Brauer indicates Bigot's species with a query as a 

 synonym of pennipes Fabricius.- 



» Ann. Soc. Ent. France, 1876, p. 397. 



2Sitz. Kaiserl. Akad. Wiss., Math.-nat. 01., vol. 107, p. 508. 



