128 DIPTERA. 
dense pilosity and the numerous macrochete on the scutellam and abdomen, and in 
the apical cell ending nearly in the wing’s tip. 
1. Lasiona multisetosa, sp.n.,g. (Tab. III. figg. 20; 20 a, head in profile.) 
Grey; four stripes on the thorax, hind borders of the abdominal segments, antenne, palpi, and legs black ; 
wings dark brown. 
Length 11 millim. . 
Of a bluish-grey coloration ; the thoracic dorsum with four black stripes, which are interrupted at the trans- 
verse suture, the outer ones the broadest; the base of the scutellum black; the abdomen with black 
reflecting spots, especially on the hind borders of the segments, the spots giving it the appearance of 
being marked with black transverse bands (these markings, however, are much obscured by the very 
dense pilosity which covers the abdomen). Front with dark reflections; frontal band black; frontal 
bristles descending on each side to the number of three beneath the root of the antenne; eyes with a 
whitish pile. Antenne rather slender; sccond joint with several bristles; arista long, and slightly 
thickened in its proximal half. Proboscis and palpi black or piceous. Femora outwardly with grey 
tomentum, the front and hind pairs with many bristles on the underside ; middle tibie outwardly with 
three long bristles; foot-claws rufous at the base. Tegule and wings dark brown ; small cross-vein before . 
the middle of the discal cell; apical cross-vein deeply incurved at its base, so that the inferior angle of 
the apical cell is projecting; posterior cross-vein strongly undulate. 
Hab. Costa Rica, Rio Sucio (Rogers). 
A single male specimen. 
MACQUARTIA. 
Macquartia, Robineau-Desvoidy, Essai sur les Myodaires, p. 204 (1830). 
This genus (in the sense that it is adopted by Schiner, and thus including the genera 
Erebia, Amodea, and Albinia of Robineau-Desvoidy) has by its slender form and 
elongate legs a Dewxia-like aspect. The head is somewhat hemispherical, as broad as 
the thorax; the face is short, nearly perpendicular, the oral margin rounded; the © 
front is much narrowed behind in the males, the eyes sometimes being almost 
contiguous; the cheeks are broad; the eyes are pilose; the vibrisse are inserted 
at some distance above the oral margin; the facial ridges have no bristles; the 
antennee are shorter than the face, the third joint usually twice as long as the second, 
the arista not visibly jointed, sometimes microscopically pubescent; the palpi are 
cylindrical, or slightly thickened towards the tip. The abdomen is conical or elongate- 
oval, with discal and marginal macrochete. The body and legs generally have many 
bristles. The wings are large, with the apical cell opened at a short distance before 
the wing’s tip. | 
In the Central-American collections which I have for examination I find specimens 
of four species belonging to the genus Macquartia, these, unfortunately, with one 
exception, being represented by males only. ‘Three of the species are closely allied to 
each other, and distinguished (in the male sex) by a more elongate-conical shape of the 
abdomen than is usual in the European forms; the fourth species has a more ovate 
abdomen, and the latter rufous or testaceous, a coloration quite different from that of 
