142 _ DIPTERA. 
more intense towards the costa ; small cross-vein on the middle of the discal cell ; curvation of the fourth 
vein with a blunt, more or less rounded angle ; apical cross-vein straight ( 3) or slightly concave towards 
the end (2); posterior cross-vein in both sexes nearly straight. 
Hab. Mexico, Omilteme 8000 feet and Sierra de las Aguas Escondidas ‘9500 feet, 
both in Guerrero (H. H. Smith). 
Five male and two female specimens. 
2. Hypostena blandita, sp.n.¢ 9. (Tab. IV. figg. 4; 4a, head in profile.) 
Whitish-grey or pale ochraceous ; head white; frontal band and antenne black; palpi rufous; thorax with 
two broad black bands; scutellum black, with a light tip; abdomen with large trigonal black dorsal 
spots ; legs black ; wings brownish. 
Length 8-12 millim. 
Front somewhat prominent—in the male much narrower, in the female broader, than the eyes, in the male 
almost wholly occupied by the black band, the latter in the female narrower than the lateral portions ; 
frontal bristles on each side in a single row, descending to beneath the second antennal joint; face 
retracted ; eyes descending not quite so far as the end of the antenne; above the vibrisse some weak 
bristles in a small groove. Antenne a little shorter than the face; second joint bristly ; third joint four 
times as long as the second. The black thoracic bands prolonged behind the transverse suture, but not 
fully reaching the hind margin of the thorax ; scutellum velvety-black, with a yellowish or whitish point 
at the tip. Abdomen conical; first segment as long as the following ; the black dorsal spots, one on each 
segment, extending to the hind margins; the second and third segments have many discal and marginal 
macrochete. Legs long and slender; middle and hind tibie with rather long bristles ; foot-claws and 
pulvilli elongate in the male, the pulvilli obscure; the front tarsi not dilated in the female. Tegule 
greyish-yellow. Wings long and narrow, dilute brownish, this colour more intense towards the costa ; 
small cross-vein a little before the middle of the discal cell; curvation of the fourth vein with a blunt 
angle ; apical cross-vein straight (¢) or somewhat concave ( 2); posterior cross-vein distinctly curved. 
Hab. Mexico, Xucumanatlan 7000 feet, Omilteme 8000 feet, and Sierra de las Aguas 
Escondidas 9500 feet, all in Guerrero (H. H. Smith), Orizaba (H. H. Smith & F. D. G.); 
Costa Rica, Rio Sucio (Rogers). 
One female and several male specimens. 
This fine species much resembles the preceding; but differs in its larger size, the 
more prominent front (¢ ), the rufous palpi, the black thoracic bands extending nearly 
over the whole thorax, and the curved posterior cross-vein. 
3. Hypostena concinna, sp. n., c. | 
Yellowish ; head white ; frontal band, two broad bands on the thorax, hind borders and a dorsal stripe on the 
abdominal segments, antenne, and legs black; palpi rufous; wings brownish. 
Length 7:5 millim. 
Closely allied to both the preceding species; the front, however, is less prominent, narrower than the eyes 
and posteriorly wholly occupied by the black frontal band. The antenne are shorter; the arista propor- 
tionately longer and somewhat pubescent. The vibrisse are inserted as in H. leucophea, and higher than 
in H, blandita. The black thoracic bands are very broad and of a somewhat irregular form. The 
abdomen has the yellowish portions more transparent ; the black markings consist of a dorsal stripe 
and a hind border to the segments, the black hind borders not fully reaching the sides; the black 
colour of the first segment is restricted to the middle. The legs are thinner, the tarsi longer ; the bristles 
weak. The small cross-vein is on the middle of the discal cell; the apical and posterior cross-veins are 
slightly curved. 
