Stratiomyiidae. 27 



spot obcordate with a very fine middle line. Thorax shining black, 

 slightly bluish; pubescence light yellowish, sometimes more greyish; 

 humeral cailus and a stripe from the callus to the wing-root white, 

 the stripe considerably broadened behind: the callus is larger and the 

 stripe is broader than in pantlierinus. Abdomen white, the base vvitli 

 a black spot, produced almost to the middle of the second segment, 

 l'ourth segment with a black transverse band at the front margin, 

 nearly reaching the side margins, fifth segment black with the hind 

 margin pale. The spot on the fourth segment varies a good deal in 

 form, it is as a rule excised in the middle of the hind margin, some- 

 times including a white spot on each side, these spots may be con- 

 nected with the white hind margin, or the band may be quite dis- 

 solved in three spots; sometimes there is a small black spot on each 

 side on the third segment, and fmally this segment may bear a little 

 black spot in the middle at the front margin. Venter black with the 

 front margin of the second and the hind margins of the third, fourth 

 and hftli segments white, these margins may be broad in the middle, 

 and the white front margin of the second segment may be enlarged 

 to a subquadratic spot, reaching the hind margin. Femora brownish 



Fig. 10. Wing of N. riliginosus. 



black, with the tips broadly white, tibiæ and tarsi white. hind tibiæ 

 brownish black in the middle, anterior tibiæ slightly darkened. Wings 

 hyaline with white veins, stigma light yellowish. Balteres white, the 

 peduncle sliglitly darkened. 



Female. Front broad, snout moderately long, shorter than in 

 pantherinus, antennæ inserted nearly in the middle; above the an- 

 tennæ two oblique white stripes, going from the eye-margin to the 

 base of the antennæ, and nearly meeting in front. Eyes nearly round, 

 not longer than high. Thorax with shorter, somewhat depressed 

 pubescence. Abdomen black, with a white triangle in the middle of 

 the second, third and fourth segments, and the hind margins of the 

 fifth and sixth segments white; the triangles may vary in size and 

 especially in breadth. All the side margin is narrowly white, but 

 widened to a triangular spot at the hind corners of the second, third 

 and fourth segments. Venter black with very narrow^ pale hind mar- 

 gins of the segments; sometimes it is entirely black. 



Length 5 — 6,-5 mm. 



