212 DIPTEEA. 



ATEACTIA. 



Atractia, Maequart, Dipt. Exot. i. 2, p. 151 (1838) . 



1. Atractia marginata, sp. n. 



Black, with a metallic green reflection, especially on the thorax ; face yellowish-white sericeous, with a few 

 black and yellowish bristles ; the (very much damaged) thorax with traces of yellowish pollinose longitu- 

 dinal stripes and also of lateral stripes along the dorso-pleural suture, the intervals between the stripes 

 shining dark metallic green ; pleura? and scutellum similarly pollinose or sericeous ; scutellum with four 

 long black bristles ; abdomen black, with a slight bluish-green reflection, densely punctate, the posterior 

 edges of the segments with a narrow whitish sericeous line ; knob of the halteres brownish, the stem 

 pale yellow; coxa? black; anterior femora brownish-yellow, with a well-defined longitudinal black stripe 

 on the posterior side ; anterior tibia? black or dark brown, yellow at the base, the yellow reaching further 

 on the front side than on the hind side ; middle femora black, brownish-yellow at the base, on the upper 

 side ; middle tibia? black, brownish-yellow at the base ; hind femora black, with a trace of brownish at 

 the base; hind tibia? black, the proximal third brownish-yellow; all the black of the femora and tibiae 

 with a metallic green reflection ; tarsi black, hairy ; wings tinged with brownish. 



Length 9 millim. 



Bab. Nicakagua, Chontales (Janson). 



A single, very much damaged, specimen of uncertain sex. I describe it, nevertheless, 

 as this singular genus has not been found so far north before. 



APIOCEPA. 



Apiocera, Westwood, Lond. & Edmb. Phil. Mag. 1835. 

 Tapinocera, Macquart, Dipt. Exot. i. 2, p. 78 (1838). 

 Pomacera, Macquart, Dipt. Exot. Suppl. i. p. 47 (1847). 

 Anypenus, Philippi, Verh. zool.-bot. Ges. Wien, xv. p. 702 (1865) . 



1. Apiocera augur, sp. n., e . 



The second of the veins issuing from the discal cell reaching the margin behind the apex ; both branches of 

 the fork of the third vein ending in the margin ; the greyish- white abdomen with a pair of velvety -black, 

 triangular spots on each of segments 2, 3, 4. 



Length, including S forceps, 16-17 millim. 



Hab. Mexico, Presidio (Forrer). 



Front and vertex silvery, beset with whitish pile ; palpi yellowish-white, the last 

 joint broad but ending in a point. Antennae blackish- brown ; first joint hoary; first 

 and second joints beset with white bristles ; third joint pear-shaped (like the fig. 26 a 

 in Philippi, I. c. t. 25), but the tip drawn out into a short, curved point. Thorax black, 

 shining above, with some greyish-white pollen along the margins of the mesonotum ; 

 pleurae black, greyish pollinose.- Abdomen greyish-white (that is, the black ground- 

 colour is entirely hidden under a covering of greyish-white pollen) ; segments 2, 3, 4 

 with, on each side, at some distance from the lateral margin, a velvety-black, more or 

 less distinct, triangle (the apex of which is turned towards the middle and the base 

 parallel to the lateral margin) ; segment 5 shows, in the same place, a brownish spot ; 

 the following two segments are nearly unicolorous, greyish-silvery; near the lateral 



