LTJTZIA BIGOTI 469 



edge marked by two narrow, bare impressed lines which are faintly continued 

 backward. Scntellum trilobate, with pale-yellow narrow scales, each lobe with 

 a large group of pale bristles. Postnotum elliptical, luteous, nude. Pleurae 

 and coxffi luteous, with patches of narrow scales, yellowish above, white below, 

 and rows of short brown bristles, a few black scales on coxae ; pleurae with dark- 

 brown integumentary spots. 



Abdomen subcylindrical, truncated posteriorly; clothed dorsally with black 

 scales, each segment, except the first, with a large apical subquadrate yellowish- 

 white patch joined to a narrow posterior margin of the same color; last segment 

 with narrow, pale apical margin and a median triangular patch dividing the 

 dark area ; first segment with a patch of dark scales and many pale hairs ; a row 

 of lateral, oblique, elongated, basal segmental white patches; venter yellowish 

 scaled, each segment marked with a V-shaped black band, the point at base of 

 segment on medio-ventral line. 



Wings rather narrow, hyaline; petiole of second marginal cell shorter than 

 its cell, that of second posterior cell a little longer than its cell ; basal cross-vein 

 distant less than its own length from anterior cross- vein ; scales black and pale 

 yellow in patches, the yellow as follows : three spots on costal vein, first very 

 long, third subapical ; two spots on first vein, the first opposite the end of first 

 costal spot and much shorter, the second at apex of vein ; a long spot near end 

 of upper fork of second vein ; a very long spot on third vein ; a small one on 

 upper fork of fourth vein, a dot at base of lower fork of fourth vein and at its 

 apex; both forks of fifth vein yellow except at base ; sixth vein yellow with a 

 black spot before tip and another near base; fringe checkered black and white, 

 the white spots mainly at terminations of veins; outstanding scales of veins 

 dense, narrowly ligulate. Halteres entirely pale. 



Legs rather long and slender; vestiture brownish black; femora pale at base 

 ajid beneath, apex broadly yellowish ; tibiae broadly sordid yellow at base, nar- 

 rowly so apically, an ochraceous line along under side, not continued to apex on 

 posterior ones ; tarsi with a yellowish-white ring at base and apex of each joint, 

 scales between bluish black; front and mid tarsi with last joint black; that of 

 hind ones yellow. Claw formula, 0.0-0.0-0.0. 



Length : Body about 6 mm. ; wing 6 mm. 



Male. — Proboscis longer than in the female, nearly straight, black scaled, the 

 tip narrowly and a broad ring beyond middle yellowish scaled. Palpi exceeding 

 the proboscis by less than the length of the last joint, last joint pointed, penulti- 

 mate joint somewhat thickened ; terminal two-thirds of long joint and last two 

 joints densely clothed with long brown and yellowish hairs; scale-vestiture pre- 

 dominatingly of ochreous yellow, the long joint with two blackish rings before 

 middle and another before apex, penultimate joint with a black ring at middle, 

 last one with a patch of black scales near base. Antennae plumose; last two 

 joints long and slender, rugose, pilose, blackish, the others short, slender, pale, 

 each with a sinuous, enlarged black ring at insertion of hair-whorl ; hairs long, 

 dense, fine, yellowish and brown, pile on penultimate joint produced into long 

 delicate hairs. Coloration similar to the female. Abdomen long, slender, 

 depressed; dorsal apical spots much larger than in the female, subtriangular, 

 lateral white ones tending to form basal bands ; last segment entirely yellow and 

 white scaled; lateral ciliation long and abundant, fine, pale yellow. Wings 

 narrower than in the female, the stems of the fork-cells a little longer; vestiture 

 sparse. Last tarsal joint of front legs yellow scaled. Front and mid-tarsal 

 claws unequal; claw formula, 1.1-1.1-0.0. 



Length : Body about 7 mm. ; wing 6 mm. 



Genitalia (plate 9, fig. 64) : Side-pieces more than twice as long as broad, tips 

 eonically tapered, marginal appendages of three stout spines and four smaller 



