﻿NO. 17 NEW DIPTERA FROM PANAMA — MALLOCH 5 



lus, f rons nearly twice as broad as long, anteriorly not more produced 

 than at lateral angles, face and cheeks yellow, opaque, the former 

 raised in center, concave in profile, cheeks three times as high at 

 occiput as at anterior edge, anterior bristle long and strong, with one 

 moderately long and a regular series of shorter hairs posterior to it, 

 antennae yellow, bristles on basal joint strong, black, third joint 

 barely twice as large as basal, covered with very short whitish pilos- 

 ity, arista brownish, nearly twice as long as breadth of frons, dis- 

 tinctly and thickly pubescent ; mesonotum yellowish brown, shining, 

 the humeri always paler, three distinct pairs of dorso-central macro- 

 chaetae, divergent and reduced in size anteriorly, pleurae yellow, with 

 darker, brown, marks and one very long bristle above mid coxae, 

 scutellum with the disc opaque black, margins brownish and slightly 

 shining, six or eight marginal bristles — the anterior pair sometimes 

 very much reduced or absent — the posterior pair strong, the next 

 pair much weaker and the third (sub-basal) pair as strong as pos- 

 terior pair, disc of scutellum bare ; abdomen brown, basal segment 

 elongate, as long as next two together, remaining segments de- 

 creasing in length, all segments with lateral and posterior two with 

 hind-marginal bristles, hypopygium yellow, not very large, and with 

 the ventral surface very hairy; legs yellow, fore femora thickened, 

 with two to three bristles on apical half of dorsal surface and two 

 on apical third of ventral surface anteriorly as well as the numerous 

 short hairs present on all legs, mid coxae with a dark spot anteriorly, 

 mid trochanters with one long bristle anteriorly, mid femora with a 

 preapical antero-dorsal bristle, mid tibiae with a short dorsal bristle 

 at near base on dorsal surface and three pairs of bristles — one of 

 each pair on postero- and antero-dorsal surfaces — the first and 

 weakest at about one-fifth from base, the second at about two-fifths 

 from base and the last at about one-third from apex, on the ventral 

 surface there is one bristle at near middle and one much stronger 

 at near apex, as well as about five apical bristles, basal joint of mid 

 tarsi with a noticeably long ventral bristle at near middle and all 

 joints with end spurs, hairs on hind tibiae very distinct, especially 

 on dorsal surface, one bristle on same surface at near to apex, basal 

 hind tarsal joint not very much swollen and about two-thirds as long 

 as second joint; wings short and blunt, pale brownish, with brown 

 veins, from humeral vein to end of first vein half as long as from end 

 of first vein to end of second, last costal division about two-thirds 

 as long as penultimate section, inner cross-vein at near to middle of 

 longest costal division, basal part of third vein short of half the 



