SCENOPINIDAE OF THE WORLD 313 



extend from the upper corner of the eye behind the ocellar tubercle 

 to the midline at the back of the head. Antennae with the first two 

 segments black-brown, subequal; the second with a fringe of hairs; 

 the third segment pear-shaped, orange basally darkening distally to 

 black-brown with a two-pointed tip. 



Thorax dorsum black, covered with dark brown pollinose scales, 

 sparse short black hair; humeral callus tan; scutellum black; pleural 

 areas black-brown, pollinose, very little membrane or light color. 

 Wings hyaline, vems light brown; halter stem light brown, knob light 

 brown, creamy below. Legs with femora black-brown, pollinose; 

 remainder of legs light brown. 



Abdomen very long, dark brown, grading to yellow-brown pos- 

 teriorly; eighth segment with dorsum shining mahogany brown, 

 sternum yellow-browm, keeled in posterior half, twice as long as ter- 

 gum. Ninth segment long, much like R. hicornis; see figure for details. 



Male. — Unknown. 



Length: Female body 6 mm., wing 2.9 mm. 



Type-locality: Applecross, West Australia; 25 February 1941 

 (K. R. Norris). 



Holotype: Female (CSIRO). 



208. Riekiella quadrifida, new species 



Figure 202 



Male. — Head black, eyes red-brown above, black below; frons 

 small, granular, extending only one-third the distance from the anten- 

 nae to the median ocellus; ocellar triangle prominent, granular, ocelli 

 dark; oral cavity tan to cream, with a black roof; mouthparts tan, 

 short, palpi short. Antennae black, granular, third segment twice as 

 long as first two combined, pear-shaped, ending in two points with a 

 median peg; see figure for details. 



Thorax dorsum black, with red-brown granular pollen ; humeral and 

 supra-alar calli tan; scutellum black, subshining; pleura black, granu- 

 lar. Wing hyaline, veins tan, cell R5 petiolate; halter stem brown, 

 knob brown, with a tan band below. Legs with femora black-brown, 

 granular; tibiae tan; tarsi tan, darkening distally. 



Abdomen black-brown, granular dorsally, shining below; ninth seg- 

 ment black-brown, four-lobed, elongate, being one-quarter the length 

 of the entire body; see figure for details. 



Feal\le. — Head black-brown, eyes black; postocular flange con- 

 tinuous with dorsal portion of frons; back of head granular; frons 

 broad, shining, over twice as wide as ocellar triangle, with a groove 

 extending from median ocellus toward the antennae where it becomes 

 an elevated swelling with sparse hairs; oral cavity with tan sides and a 



