AKT. 1 NEW DIPTEEA FROM SOUTH AMEEICA ALDEICH H 



as usual reduced to small red lobes. Penis rather long, black except 

 at base, the tip suddenly bent forward in two flat rounded lobes, 

 somewhat hoodlike, under which several minute sharp processes 

 project toward the base of the organ; about the middle on the front 

 side a flat attachment arises which extends cephalad and then curves 

 broadly toward the tip of the penis, usually resting against it in the 

 spread specimens. Posterior claspers slender and curved clawlike, 

 anterior shorter and less slender, the extreme tip notched into two 

 minute points. 



Wing subhyaline, costal spine distinct, third vein hairy almost to 

 the crossvein, first vein usually with one to four coarse hairs or 

 spinules near middle (absent in both wings in 4 specimens out of 23). 



Female.— Front one-third of head width (0.33, 0.34, 0.37 in three 

 specimens measured) ; the usual two pairs of orbital bristles. No 

 median marginals on second segment, on the third a noticeable space 

 betAveen the median pair and the rest of the row. Fourth abdominal 

 segment above and three evident sternites below, yellowish red, con- 

 trasting as in the male with the rest of the abdomen. The rows of 

 pollinose spots on dorsal surface of abdomen are larger than in the 

 male, tending to be a little tesselated. The hairs of scutellum and 

 abdomen are less erect than in the male. 



Length, 4 to 7.5 mm. 



Described from 8 males and 15 females ; 20 including the type are 

 from Angol, Chile, collected by D. S. Bullock in December, 1925, and 

 January, 1926; one from Santiago, Chile, collected by A. Faz in 1923; 

 two are from Southern Chile, collected many years ago by M. J. 

 Rivers. 



Type.— Male, Cat. No. 40963, U.S.N.M. 



The species differs from the type of the genus, TacMna devia 

 Fallen, with which it has been compared, in having the head less 

 bulging behind, the paraf acial with stronger bristles, the prescutellars 

 wanting, and the costal spine stronger, as well as in the usual presence 

 of a few setules on the first vein. 



Family TACHINIDAE 



CALLESTHES, new genus 



The genotype is a minute muscoid fly with hypopleural bristles, 

 well developed postscutellum and plumose arista. Front rather 

 prominent, antennal axis about one-fifth longer than vibrissal. An- 

 tennae inserted at the middle of the eye; face flat below with very 

 slight keel on upper part; vibrissae at oral margin, which is somewhat 

 above the lower edge of the head. Facial ridges bare; palpi ordi- 

 nary, proboscis small. Cheek nearly one-half the eye height. Male 

 with a single pair of rather large verticals; frontals beginning some 



