ART. 16. NOKTII AMERICAN SCELLUS GKEENE. 13 



other veins are blackish; male wing has a faint double spot on the 

 posterior cross-vein and a faint spot at the bend of the apical seg- 

 ment of the fourth vein; female wing with the above spots much 

 darker and a large, definite, light spot below the fifth vein in front 

 of the basal cell; male appendage narrow with a nearly quadrate 

 enlargement in the middle. 



Length. — Male, 3.5 mm. (without appendages) ; female, 5 mm. 



The narrow face dull ocher, broader below; front dull gray. 

 Pleura bronze colored with a thick, opaque, gray dust; just in front 

 of the halteres is a well-developed fingerlike tubercle. The scutel- 

 lum same color as the pleurae and with two large bristles at the 

 apex. The abdomen is dark, metallic bronze, not so thickly dusted 

 as the thorax; broadly along the apical edge of the segments and 

 toward the outer edges the dust is whitish. Anal appendages of the 

 male white and ribbonlike on the apical half with a fine fringe 

 of short white hairs on inner edge; basal portion is blackish; in 

 the middle is a broad area which is nearly quadrate with a fringe of 

 brownish-yellow hairs along the inner and outer edge, that on the 

 inner edge is longer; other parts of the genitalia are brownish 

 with yellow hairs. Coxae of a blackish bronze color with whitish 

 dust. Feet black, the femora with a more coppery, the tibiae with 

 a more metallic-greenish tinge. Fore femora much thicker at the 

 base, on under side strong black bristles of various length. Middle 

 femora thickened on apical two-thirds, bent inward and downward 

 at the basal third. Hind femora thick;ened, the basal edge is 

 straight, the upper edge is arched. Fore tibiae thickened on the 

 apical two-thirds, near the basal third on the inner side is a thick 

 spikelike projection, on the front inner side is a long bristle, numerous 

 short thick spinelike bristles on the under and inner edge. Middle 

 tibiae slightly thickened at base, two faint curves; on the under and 

 outer side is a long tuft of curved hairs, more curly on outside; 

 numerous bristlelike hairs on inner under side near the apex; on 

 under side near the apex is a very thick spine bent at right angles. 

 Hind tibiae normal with several short spinelike bristles on the 

 apical third, at the apex are three thick bristles, one is sharply 

 bent at apex. Tarsi all simple, black ; front metatarsus with a long 

 bristle on the under side below the middle; middle metatarsus has 

 several heavy bristles on under side, four very long ones are arranged 

 in a row. Wings faintly infuscated on the apical half from the 

 fourth vein to the costa, a small cloud near the middle of the outer 

 section of the fourth vein and a cloud on the third cross-vein. The 

 first vein entire and the costal vein from the tip of the first vein 

 to the base is pale yellow, all the other veins brownish-black. Hal- 

 teres yellow with base of stem blackish. Tegulae and cilia pale 

 yellow. 



