ABT.l NEW DIPTERA FROM SOUTH AMERICA ALDRICH 9 



than two-thirds of the way from the small cross vein to the bend; 

 last section of the fifth vein one-third the preceding. Veins bare 

 except the third, which has four or five hairs at base. 



Length, 6.2 mm. 



Described from one male collected at Santiago, Chile, by Alfredo 

 Faz. 



Ty^e.— Male, Cat. No. 28908, U.S.N.M. 



Genus PACHYOPHTHALMUS Brauer and Bergenstamm 



PachyophthaJiuus Beaueb and Bergenstamm, Zweifl. Kais. Mus., pt. 4, 

 1889, p. 117 ; pt. 6, 1893, pp. 170, 195.— Allen, Proc. U. S. Nat. Mus., vol. 

 68, art. 9, 1926, p. 7. 



PACHYOPHTHALMUS ORNATICAUDA, new species 



Male. — Front 0.21 of head width, covered with yellowish pollen and 

 having the usual double row of bristles to the antennae. Parafacial 

 with slightly paler pollen, the facial ridges with a few small bristles 

 above the vibrissae ; antennae black, the third joint a little longer than 

 the second ; arista short ; palpi black, proboscis short. 



Thorax shining black with very striking white pollinose stripes, 

 one on each side of the middle, and another from the humerus to the 

 root of the wing having a more yeUow tinge behind the humerus. 

 When viewed from behind there is also an incomplete stripe from 

 the suture to the postalar declivity above the root of the wing. The 

 white stripes next to the middle reach to the apex of the scutellum. 

 Pleura very pollinose, a black stripe from the humerus passing below 

 the root of the wing and another indefinite stripe along the upper 

 edge of the sternopleura. 



Abdomen black with a paler pollinose stripe on each side of the 

 median line partially divided into spots and composed of pollen 

 which shows some brown reflections; the first three segments are 

 broadly gray pollinose below and on the sides, that on the sides 

 forming a silvery spot on the second and third segments, the fourth 

 segment deep golden pollinose, especially well colored on the sides, 

 the hind edge wider in the middle, shining black. Genital segments 

 black ; inner forceps shining black, the outer yellow. 



Legs black, the claws and pulvilli elongate. Wing hyaline with 

 the usual venation for the genus. 



Length, 5.2 mm. 



Described from one male, collected at Perales, Chile, by Father 

 Pirion and transmitted to the U. S. National Museum by Alfredo 

 Faz. 



Type.— Male, Cat. No. 28909, U.S.N.M. 



2605—28 2 



