MYOBIA. . 135 
particulars :—The ground-colour of the thorax and scutellum is whitish-grey ; the thoracic stripes are 
only conspicuous before the transverse suture; behind this suture is a large black spot, occupying the 
whole breadth of the thorax; the antenna, especially the basal joints, show a tendency to become rufous ; 
the vibrisse are inserted just at the oral margin; and the legs are wholly black. The abdomen is similar 
in shape and coloration to that of M. grata; but the front borders of the second and following segments 
show white reflections, which are absent in M, grata. 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
‘'wo male specimens. 
5. Myobia lepida, sp. n., 3 2. | 
Thorax and scutellum cinereous; abdomen yellow, transparent, with a dorsal stripe and the hind border of the 
third segment black; no discal macrochete ; antenne (except the basal joints in the male, which are 
rufous) and legs blackish. 
Length 7 millim. : 
Head white, with ochraceous reflections on the front and cheeks; front in the male much narrower than, in 
the female scarcely as brvad as, the eyes; the frontal band black, linear in the male, as broad as the 
lateral portions in the female; frontal bristles on each side in a single row, descending in the male to the 
root of the antenne, in the female somewhat lower; vibrisse inserted nearly at the oral margin and 
surmounted by some shorter bristles. Antenne shorter than the face, black, the basal joints rufous in 
the male; third joint three times as long as the second; arista thickened in its proximal half. Proboscis 
(or at least its terminal lips) and palpi rufous. Thorax and scutellum greyish-cinereous ; thoracic dorsum 
with four black stripes, which are linear in the male and broader in the female, the outer ones interrupted 
at the transverse suture, Abdomen nearly cylindrical ( ¢) or subconical (9 ), yellow, and transparent ; 
first segment as long as the following one; in the male the black dorsal stripe is narrow and somewhat 
extended on the hind borders of the first and second segments, and the hind border of the third segment 
is wholly black ; in the female the dorsal stripe is broader and the black hind border of the third segment 
narrower ; the front margins of the segments with white reflections, which are more distinct in the 
female ; anus rufous in both sexes ; macrochete rather long, only on the hind margins of the segments. 
Legs piceous, the cox grey; bristles weak ; hind tibie outwardly with four equidistant bristles, in the 
female also with a row of short bristles; foot-claws and pulvilli a little elongate in the male, at least 
those of the first pair, the pulvilli yellowish. Tegule yellow (¢) or whitish (2). Wings grey, in the 
male with some brownish tint; small cross-vein on the middle of the discal cell ; curvation of the fourth 
vein with a blunt angle; apical and posterior cross-veins very slightly curved. 
Hab. Mexico, Amula 6000 feet, Xucumanatlan 7000 feet, Omilteme 8000 feet and 
Sierra de las Aguas Escondidas 9500 feet, all in Guerrero (H. H. Smith). 
Several specimens of both sexes. 
6. Myobia argenticeps, sp. n., 2. 
Thorax cinereous, with black stripes; scutellum ochraceous; abdomen yellow, transparent, with grey reflec- 
tions, the segments with a black dorsal stripe anda black hind border; no discal macrochete ; head 
whitish, with silvery reflections ; antenna, proboscis, palpi, and legs rufous. 
Length 7 millim. 
Front as broad as the eyes, silvery-white, with parallel sides; vertex somewhat ochraceous ; frontal band 
blackish, linear; frontal bristles stout, but few in number, three of them descending beneath the root of 
the antenne ; face and cheeks silvery-white, the cheeks narrow; vibrissee inserted at the oral margin ; 
eyes large, descending to the inferior part of the head. Antenne reaching to near the vibrisse, rufous ; 
third joint four times as long as the second, slightly infuscated ; arista scarcely thickened at the base. 
Proboscis and palpi pale rufous, the proboscis short. Thorax yellowish-cinereous, with four blackish 
