HYPOSTENA. 145 
8. Hypostena melaleuca, sp.n., ¢. (Tab. IV. fig. 6, wing.) 
Black ; face whitish; thorax with whitish tomentum and four black stripes ; the front border of the second 
and following abdominal segments whitish ; wings brownish. 
Length 5°5 millim. 
Front a little prominent, narrower than the eyes; frontal band black, much broader than the lateral portions ; 
frontal bristles descending as far as the end of the second antennal joint ; face slightly inclined; oral 
margin pilose; beard whitish. Antenne black, much shorter than the face; third joint three times as 
long as the second ; arista thickened to one third of its length. Palpi black. The black stripes on the 
thorax are broad, the interspaces between the median and outer stripes narrower than that between the 
two median; behind the transverse suture all four stripes disappear in the general black colour of the 
disc; the light tomentum on the pleure forms irregular spots; scutellum black, with a whitish tip. 
Abdomen subconical; the whitish front borders of the second and third segments occupying nearly the 
basal third and rather distinctly limited; anal segment greyish-white, black at the tip; discal and 
marginal macrochate are present; the underside and the anus are clothed with long hairs. Legs black, 
moderately long ; hind tibie: outwardly with several bristles, four of them (two below the middle and two 
before the apex) being longer than the others; foot-claws and pulvilli elongate. Tegule yellowish-grey. 
Wings brownish, more dilute towards the posterior margin; third vein slightly bent upwards before its 
end; curvature of the fourth vein rounded; small cross-vein on the middle of the discal cell ; apical and 
posterior cross-veins slightly curved. 
Hab. Muxico, Teapa in Tabasco (H. H. Smith). 
A single male specimen. 
9. Hypostena cylindriventris, sp.n., ¢ ¢. 
Black ; thorax, at least anteriorly and laterally, cinereous, with four black stripes; the front border of the 
second and following abdominal segments yellowish or white; palpi rufous; wings brownish towards 
the costa. 
Length 5°5-7°5 millim. 
Of a slender shape. Front of the male slightly prominent, narrower than the eyes, and wholly occupied by 
the black frontal band,—that of the female as broad as the eyes, laterally whitish ; frontal bristles on 
each side in a single row, descending as far as the end of the second antennal joint; face whitish, some- 
what inclined ; vibrisse: inserted a little above the oral margin and surmounted by some shorter bristles ; 
beard white. Antenne distinctly shorter than the face; third joint narrow, three or four times as long 
as the second; arista thickened to near the middle. Proboscis black, its terminal lips and the palpi 
rufous. Thoracic dorsum in the male black, before the transverse suture cinereous with four black 
stripes, of which the outer ones are the broadest ;—in the female more generally cinereous, the stripes 
more conspicuous and also distinct behind the suture ; pleure greyish; scutellum black. Abdomen 
elongate-conical, black ; second and third segments with white or yellowish-white front borders, which 
in the middle are narrower; many long discal and marginal macrochzste are present, and in the male 
the ventral surface is beset with long black hairs. Legs black, long and slender ; posterior tibiee with 
some long bristles ; foot-claws and pulvilli elongate in the male, the pulvilli yellowish. Tegule yellowish 
(dé) or whitish (9). Wings greyish-hyaline, brownish towards the costa ; small cross-vein before the 
middle of the discal cell; curvature of the fourth vein with a blunt angle; apical cross-vein nearly or 
quite straight ; posterior cross-vein more or less curved. 
Hab. Mexico, Sierra de las Aguas Escondidas 7000 feet and Omilteme 8000 feet, 
both in Guerrero (H. H. Smith). 
Three male and two female specimens. 
BIOL. CENTR.-AMER., Dipt., Vol. IL., June 1890. a u 
