112 INSEICUTOR INSCITI^ MENSTRUUS 



brown scales with golden and coppery reflection, scales on 

 front margin and sides pale yellow. Bristles on front margin 

 and over roots of wings. Scutellum strongly trilobate, clothed 

 with flat black scales with blue reflection ; on the base of the 

 midlobe, however, they are pale and in some lights silvery 

 white. Each lobe with a group of dark bristles. Postnotum 

 elliptical, prominent, yellow, a group of setse near posterior 

 margin. Pleurae and coxae yellow with patches of flat white 

 scales. 



Abdomen subcylindrical, compressed, truncate apically and 

 with terminal setae ; smaller setae at apices of the segments 

 ventrally. Clothed dorsally with flat black scales with light 

 violet reflection ; ventrally flat creamy white scales, raised along 

 mid-ventral line. The colors at sides deeply incised. 



Wings hyaline, longer than abdomen. Petiole of second 

 marginal cell one-third as long as its cell, that of second pos- 

 terior cell more than one-half its cell ; basal cross-vein less 

 than its own length from anterior cross-vein ; scales of veins 

 ligulate, denser and broader near the apex of the wing, brown. 

 Halteres yellowish with black knobs. 



Legs long and slender, bronzy black, with violet reflection, 

 femora brassy beneath, tibiaa and tarsi with brighter bronzy 

 luster beneath. Four last tarsal joints of midlegs pure white 

 on one side, tip dark. On hind legs all the basal parts of the 

 joints covered with white scales on one side, diminishing in 

 number toward the apices. On the first joint the scales are 

 hardly visible, on the last two joints they cover the whole 

 length of the joint except the tip, and on the second and third 

 joints intermediate stages. 



Claw formula: 0.0-0.0-0.0. 



Length : body, 4 mm. ; wing, 4 mm. 



Male : Proboscis very long and slender, the slight curve more 

 distinct than in the female. Palpi as in the female. Antennae 

 with the joints shorter than in the female, the whorls of hairs 

 longer, so that it gives them a denser appearance. Coloration 

 of head, thorax, abdomen, and legs as in female. Abdomen ex- 

 panded at tip. 



