MYSTACELLA. 53 
black stripes, which are slightly interrupted at the transverse suture, the outer stripes somewhat broader 
than the others; scutellum testaceous, somewhat transparent. Abdomen reddish-testaceous, with a black 
dorsal ‘band and yellowish reflecting spots, which usually appear on the front margins of the segments—in 
some directions these spots are bordered by other brown or black spots, and the dorsal band becomes double ; 
some macrochete are present only on the sides and on the anal segment, there are none on the dorsum ; 
ventral face densely beset with black hairs, especially towards the anus. Legs black; front femora with 
regularly-placed long bristles ; front tibiee outwardly with a row of short bristles ; hind tibie fringed on 
the outside, and in the middle outwardly with one, inwardly with three long bristles ; foot-claws and pulvilli 
elongate, the pulvilli greyish. Tegule whitish. Wings nearly hyaline, with a yellowish tint at the base 
and along the costa ; small cross-vein under the end of the auxiliary vein and on the middle of the discal 
cell; curvation of the fourth vein forming a rectangle ; apical and posterior cross-veins slightly curved. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith), Tuxpango (coll. Bellardi). 
A single male specimen was captured by Mr. Smith; and I have seen another, quite 
similar, in the collection of Prof. Bellardi. 
2. Mystacella lugubris, sp. n., ?. 
Black ; thorax anteriorly grey with black lines; scutellum brown; head whitish ; palpi rufous. 
Length 8°5 millim. 
Front blackish, slightly prominent, broader than the eyes; frontal band dark rufous; frontal bristles on both 
sides in a single curved row, descending as far as the end of the second antennal joint; two stout bristles 
external to each row; face and cheeks white, with greyish reflections; cheeks broad, with a row of short 
black hairs; vibrisse at a considerable distance above the oral margin, and surmounted by a row of four 
shorter bristles on the facial ridges; beard and pilosity of the eyes white. Antenne black, descending to 
two-thirds of the face; second joint bristly ; third joint twice as long as the second ; arista thickened to 
beyond the middle. Proboscis black ; palpi rufous, with black hairs. Thorax black, anteriorly with some 
whitish tomentum and the beginning of two black lines; scutellum castaneous. Abdomen broadly ovate, 
not longer than the thorax, shining black and black-haired ; macrochxtz on the hind margins of the 
second and third segments, and more numerously on the anal segment. Legs black ; front tibiee with 
short bristles ; middle tibise with some long bristles ; hind tibie outwardly fringed with bristles and with a 
longer one beneath the middle. Tegule blackish. Wings greyish-hyaline, the base and the small cross- 
vein slightly infuscated ; this cross-vein before the middle of the discal cell; apical cross-vein slightly 
curved ; posterior cross-vein nearly straight. , 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
A single female specimen. 
This species has some resemblance to Nemorewa obscurelia, but may easily be distin- 
guished from it by having the vibrisse distinctly removed from the oral margin, the 
head and the tomentum on the thorax whiter, the arista shorter and thicker, &c. 
3. Mystacella violacea, sp.n., ¢ 2. 
Cinereous (sometimes of a more obscure colour) with a violet tint; head ochraceous; frontal band, four 
thoracic stripes, hind margins of the abdominal segments, antenne ‘(except the basal joints), and legs 
black ; palpi rufous; wings infuscated at the base and along the costa. 
Length 9°5 millim. 
Head ochraceous with brown reflections; front narrowed behind, in the female broader ; frontal band black ; 
frontal bristles rather weak, descending on both sides in a double row beneath the root of the antenne ; 
eyes in the female less pilose, only a little pubescent ; vibrissee surmounted by some shorter bristles. 
Basal joints of the antenne rufous; third joint black, rufous at the base ; second joint bristly on its upper 
