326 DIPTERA. 
4. Limnophora umbrosa, sp. n., 2. 
Black; legs piceous; wings with brown markings at the costa, the end of the third and fourth veins, and on 
the cross-veins. 
Length 45-5 millim. 
Front slightly prominent, as broad as the eyes, cinereous; frontal band black, divided into two stripes; face 
and cheeks whitish-grey, the face somewhat concave; inferior part of the cheeks equalling one-fourth of 
the longitudinal diameter of the eyes. Antenne black, inserted distinctly above the median line of the 
eyes; second joint bristly; third joint more than three times as long as the second, reaching to near the 
vibrissee. Proboscis and palpi black. Thorax, scutellum, and abdomen black; thorax before the trans- 
verse suture with cinereous tomentum and four black stripes; metanotum grey; abdomerf convex, ovate, 
pointed towards the tip, with scarcely perceptible greyish markings and with some erect macrochete at 
the sides, on the hind margin of the third segment, and on the anal segment. Legs piceous. Tegule 
greyish ; halteres yellowish-rufous. Wings with a short costal spine, brownish; the costa, except at the 
base, but including the mediastinal cell, a rounded spot on the small cross-vein, and a broad border on 
either side of the posterior cross-vein, dark brown; the tips of the third and fourth veins clouded with 
brown; small cross-vein under the end of the first vein and a little beyond the middle of the discal cell ; 
third and fourth veins parallel; terminal section of the fourth vein longer than the penultimate section 
(3:2); posterior cross-vein straight, much longer than the last section of the fifth vein. 
Hab. Costa Rica, Rio Sucio and Volcan de Irazu (Rogers). 
Two female specimens. 
5. Limnophora socia, sp. n., 2. 
Cinereous ; four stripes on the thorax and four spots on the abdomen blackish; basal joints of the antenne, 
palpi, and legs rufous ; cross-veins bordered with brown. 
Length 4:5 millim. , 
Front cinereous, as broad as the eyes; frontal band black, divided into two stripes; face, cheeks, and occiput 
greyish; inferior part of the cheeks narrow. Antenne inserted above the median line of the eyes; the 
basal two joints, and also the base of the third, rufous, this joint for the rest brown. Proboscis brown ; 
palpi yellowish-rufous. Thorax, scutellum, and abdomen cinereous; thorax with four brown stripes ; 
metanotum grey. Abdomen ovate, pointed towards the tip; two large, quadrangular brown spots on the 
second and two others on the third segment; discal and marginal macrochete on the third and anal 
segments. Legs rufous, witn black tarsi (in one of the specimens the femora are black to near the tip); 
foot-claws and pulvilli short. Tegule whitish; halteres yellow. Wings brownish-hyaline; the costa 
fringed with short bristles to as far as the mediastinal vein, where there is a costal spine; small cross-vein 
and posterior cross-veins bordered with brown; small cross-vein under the end of the first vein and nearly 
on the middle of the discal cell; third and fourth veins parallel and very slightly arcuate; terminal 
section of the fourth vein longer than the penultimate section (3:2); posterior cross-vein straight. 
Hab. Mexico, Omilteme 8000 feet and Sierra de las Aguas Escondidas 9500 feet, 
both in Guerrero (H. H. Smith). 
Five female specimens. 
LEUCOMELINA. 
Leucomelina, Macquart, Dipt. Exot., Suppl. 4, p. 261 (1850). 
This genus was founded by Macquart on a Brazilian species, L. pica. Its characters 
are, as usual with this author, very briefly indicated, and among them the arista is 
mentioned as bare: in his figure also (J. c. t. 24. figg. 3a and 36) the arista is repre- 
sented without any pubescence. Macquart, though he described the male sex only, 
