308 



U.S. NATIONAL MUSEUM BULLETIN 277 



granulosis; ocelli orange-red; mouthparts well developed, black, with a 

 lighter tip; palpi tan; oral opening black posteriorly grading into white 

 which joins the area on the lower frons. Antennae black, granular; 

 first segment short; second segment twice as Avide and long as first; 

 third segment pear-shaped, not twice as long as first two combined, 

 ending in two distinct points with a median peg. 



Thorax dorsum black, covered with grayish brown pollen ; humeral 

 and supra-alar calli tan; pleura black, with gray granulosis. Wings 

 brownish hyaline, veins brown, M 1 + 2 reaching R5 closing off a cell; 

 halter stem brown, knob tan-brown; legs black-brown, granular. 



^/ / /y 



Figure 198. — Riekiella collessi, new species, male, female: a, male wing; b, female wing; 

 c, d, lateral and frontal aspects of male head; e, f, lateral and frontal aspects of female 

 head; g, h, enlarged details of male and female heads; i, ;, ventral and lateral aspects of 

 male terminalia; k, ventral aspect of female 8th sternum and 9th segment; /, lateral 

 aspect of female 8th and 9th segments. 



Abdomen first three segments black, with brown granulosis, remain- 

 ing segments more shining, no distinct broad band of white membrane. 

 Ninth tergum red-brown, granular, divided into four lobes; aedeagus 

 as two stiff spines extending beyond ventral lobe; see figure for details. 



Female. — Head black, eyes black; postocular ridge narrow, cov- 

 ered with gray pollen, with sparse stiff hairs; frons gray poUinose, 

 with two median bands of brownish pollen on either side of a median 

 groove, a few sparse hairs; ocellar tubercle gray poUinose with a few 

 sparse hairs; ocelli red-orange; mouthparts brown, palpi cream-orange; 

 oral opening with anterior two- thirds cream-orange; antennae Avith 

 first two segments black with gray pollen; third segment pear-shaped, 

 pubescent, shining bronze or black depending on the light. 



