52 THE DIPTBRA.-RRACHYCEBA OF TASMANIA, 



fourth posterior cell wide open ; anal cell closed well above 

 the wing margin; discal cell small, pointed posteriorly. 

 (The venation of this species is almost the same as that 

 of von Krbber's genus Selonalys.) 



P. occulta may be distinguished from P. verwsta, by 

 having the abdomen a uniform dark brown, instead of 

 having the seventh and eighth segments orange; from all 

 the other Tasmanian species by the black thorax with two 

 pale grey stripes, and by the black front. It is possible, 

 however, that it may be confused with the species of the 

 genus Lonchorrhynchus, to which it bears some resem- 

 blance, but from these it may be at once distinguished 

 by the open fourth posterior cell. 



P. ace u It a is only known from a single specimen taken 

 by myself at Brown's Caves, Bagdad; it was settled on a 

 stone in a small gully, the date of capture being Novem- 

 ber 9, 1914. 



PSILOCEPHALA SAXATILIS, Sp. nOV. 



Eyes joined in male, but very widely separated in 

 female, in both sexes with a deep furrow. Front in male 

 chiefly occupied with the eyes, in female light brown, 

 extensively spotted and mottled with dark brown ; thorax 

 light brown with dark longitudinal stripes, which are 

 broken up into numerous spots and dots ; abdomen dark 

 brown, bordered along the sides with yellow ; legs light 

 brown; wings tinged and faintly mottled with brown (o) 

 or brown and distinctly mottled with dark brown (?). 



Length. Male, 6 mm. ; female, 8 mm. 



Hab. Bagdad Valley. 



Male. Bead chiefly occupied by the large eyes, which 

 are joined from the vertex to about the middle of the 

 front ; the eyes are divided into two portions by a furrow 

 that runs parallel with the antennae. Facei grey. Pro- 

 boscis dark orange, almost concealed within the mouth 

 aperture. Antenna? much shorter than the head, the first 

 joint light brown, bearing black hail's, about three times 

 the length of the second, the second and third orange, 

 the latter expanded, a little longer than the first, and 

 terminated by a short black style. Thorax light brown, 

 covered with dark brown spots and dots arranged in lines; 

 in the middle is a narrow uninterrupted line, on each 

 side of this a broad line broken up into large detached 

 spots, outside these on each side a row of numerous small 

 dots, and outside these again on each side two irregular 

 lows of larger spots and dots, the whole bearing black 



