AET. 1 NEW DIPTERA FEOM SOUTH AMERICA ALDEICH S 



compound eyes literally cover the whole head except the flattened 

 hind surface and a triangle above where the ocelli and antennae are 

 situated. The two posterior ocelli are large and prominent, a trans- 

 verse groove just anterior to them. Pile of eyes dense, dark in 

 front, more pale yellow at sides. Proboscis visible but minute. 

 Mesonotum covered with dense glistening pale yellow pile, the 

 ground color mostly dark yellow with or without faint lighter 

 stripes. Hind calypters translucent brownish yellow with well- 

 defined brown rim and yellow fringe. Pile of abdomen yellow, 

 much less conspicuous than on mesonotum. Wing small, tinged with 

 yellow; the second and third veins fork just before the anterior 

 crossvein, which is at the extreme base of the discal cell; an extra 

 crossvein in the first posterior cell just beyond tip of discal, the 

 second section of the first posterior closed and petiolate; all of the 

 veins reach the margin; fourth posterior closed and with compara- 

 tively long petiole which is sometimes equal to the vein forming the 

 apical boundary of the cell. 



Length, 13 to 17 mm. 



Described from three males collected at Mera, Ecuador, in February, 

 1923, by F. X. Williams; they were received from the Hawaiian 

 Sugar Planters' Association, to which one paratype is returned. One 

 specimen has notably paler thorax and abdomen than the others, 

 having no distinct darker abdominal marking. 



Type.— Male, Cat. No. 40987, U.S.N.M. 



OCNAEA FALCIFER, new species 



Male. — Head, thorax, legs, and abdomen black or brown, the second 

 abdominal segment yellow on apical half or more, sides of second, 

 third, and fourth, and posterior bands on the sternites also yellow; 

 third antennal joint brownish yellow, long, slender, and sickle 

 shaped as in gigas, but lighter in color; eyes with dense, long black 

 pile; thorax with dense blackish pile, which has a reddish tinge 

 when viewed from in front. Hind calypter deep brown, with black 

 border and brown fringe. Legs black, the tarsi a little lighter. 

 Wings small, with yellow tinge ; venation as in gigas, but the second 

 section of the first posterior cell is wide open in one specimen, 

 narrowly closed in the other, and the fourth posterior cell is closed 

 near margin in three of the four wings, wide open in the other. 

 This open fourth cell is on the other fly from the open first. 



Length, 12 to 14.7 mm. 



Described from two males, collected with the specimens of gigas. 

 The paratype is returned to the Hawaiian Sugar Planters' Asso- 

 ciation. 



Type.— Male, Cat. No. 40988, U.S.N.M. 



