MYOTHYRIA. | 209 
long as the face; third joint four times as long as the second; arista thickened at the base. Terminal 
lips of the proboscis rufous; palpi pale rufous. Thorax and scutellum light grey, with some ochraceous 
tint ; thoracic dorsum with four black stripes (the intermediate ones at a greater distance from each other 
than from the outer ones), which behind the transverse suture disappear in a more general black colora- 
tion; base of the scutellum black. Abdomen elongate-oval, pointed towards the anus, greyish; first 
segment and broad hind borders to the following segments black ; discal and marginal macrochzetz present. 
Legs bristly ; hind tibie outwardly with several, rather long bristles, Tegule whitish. Wings greyish- 
hyaline; small cross-vein before the middle of the discal cell; curvature of the fourth vein somewhat 
rounded ; apical and posterior cross-veins nearly straight, the former ending at the same point as the third 
vein, the latter beyond the middle between the small cross-vein and the curvature of the fourth vein. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 
A single female specimen. 
2. Myothyria majorina, sp. n.,¢ 2. (Tab. IV. figg. 19¢; 19a, head in 
profile.) 
Cinereous; frontal band, four thoracic stripes, antenn, and legs black; palpi rufous; no discal macrochete 
on the abdomen. 
Length 5°5-7 millim. 
Front cinereous, in the male as broad as, in the female broader than, the eyes; frontal band narrower than the 
lateral portions; frontal bristles descending a little beneath the root of the antenne; face and cheeks 
whitish ; vibrissse inserted at some distance above the oral margin. Antenne much shorter than the face ; 
second joint bristly ; third joint three times as long as the second, with the tip somewhat pointed in front ; 
arista thickened at the base. Proboscis black, its terminal lips rufous; palpi pale rufous. Thorax and 
scutellum cinereous or yellowish-cinereous, with four black stripes, which are slightly prolonged behind 
the transverse suture. Abdomen conical, of the same coloration as the thorax ; first segment blackish ; 
the following segments in the male with more or less distinct brown hind borders, in the female with 
blackish reflecting spots ; macrochetz long, only at the hind margins of the second and following segments. 
Front tibize with short bristles; middle and hind tibise with several long bristles; foot-claws and pulvilli 
elongate in the male. Tegule yellowish (¢) or greyish (2). Wings with a short costal spine, greyish- 
hyaline, in most specimens somewhat infuscated towards the costa; small cross-vein on or a little before the 
middle of the discal cell; apical cell narrow, especially towards its end, closed at the wing’s margin; cur- 
vature of the fourth vein angular; apical cross-vein concave; posterior cross-vein curved. 
Hab. Mexico, Chilpancingo 4600 feet, Amula 6000 feet, Xucumanatlan 7000 feet, 
Omilteme 8000 feet, all in Guerrero, Teapa in Tabasco (Z. H. Smith). 
Many male specimens, but only a single female. 
3. Myothyria degeerioides, sp. n., 9 
Blackish ; head whitish ; thorax anteriorly grey, with black stripes; abdomen with a narrow white front border 
to the first and second segments ; no discal macrochete on the abdomen; palpi rufous. 
Length nearly 3 millim. 
Front broader than the eyes; frontal band black, as broad as the lateral portions ; ; frontal bristles descending 
as far as the second antennal joint. Antenne black, a little shorter than the face; third joint three times 
as long as the second ; arista thickened at the base. Proboscis black ; palpi pale rufous, thickened towards 
the tip. Thorax with a grey tomentum on the shoulders, on the pleure, and before the transverse suture, 
anteriorly with four black stripes. Abdomen ovate, shining black; second and third segments with 
‘narrow white front borders, which are interrupted in the middle; long macrochete are on the hind 
margins of the second and following segments. Legs black; hind tibie with some bristles of unequal 
length. Tegule whitish. Wings greyish-hyaline, with a short costal spine; small cross-vein before the 
BIOL. CENTR.-AMER., Dipt., Vol. Il., Apra/ 1891. Qe 
