MYSTACELLA. 57 
length. Teoule white. Wings greyish-hyaline; small cross-vein nearly on the middle of the discal cell ; 
apical and posterior cross-veins curved. 
Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (A. H. Smith). 
A single female specimen. 
9. Mystacella fuscicostalis, sp.n.,3. (Tab. III. figg. 5, 5a, head in profile, ¢ .) 
Ochraceous; frontal band, four thoracic stripes, hind margins of the abdominal segments, antennz, and legs 
black ; wings infuscated at the base and along the costa. , 
Length 10 millim. 
Allied to the two preceding species, but distinguished by the bright ochraceous tomentum and the total 
absence of violet or metallic coloration. Head ochraceous, with brown reflections; the central portion of 
the face yellowish-white ; frontal bristles descending on both sides in a single row; the bristles above 
the vibrisse more numerous and reaching to about one third of the face. Antenne entirely black. Palpi 
black, more or less rufous towards the tip. The black thoracic stripes rather broad; the pleure partly 
covered with a yellowish-grey tomentum ; scutellum rufous. Abdomen bright ochraceous, with brown 
reflections ; first segment black, the following segments with a rather narrow black hind border ; macro- 
cheete not very strong and scarcely rising between the dense black pile—on the second and third segments, 
however, they are conspicuous in the middle and on the hind margins; ventral face brown, with the 
front borders of the segments greyish. The brownish coloration at the base and along the costa of the 
wings is more intense than in M. violacea and M. lineata; the venation is similar to that of these two 
species. 
Hab. Mexico (coll. Bellardi); Costa Rica, Cache and Irazu (Rogers). . 
Four male specimens have been received from Costa Rica. I have also seen a male 
example from Mexico in the collection of Prof. Bellardi. 
10. Mystacella flavifrons, sp. n.,¢ ¢. 
Ochraceous ; antenne, legs, frontal band, four stripes on the thorax, and some large reflecting spots on the 
abdomen black ; anal segment rufous. 
Length 10-10°5 millim. 
The front, the upper portion of the cheeks, the thoracic dorsum, and the scutellum covered with a bright 
ochraceous tomentum. Front prominent, narrowed behind, and there as broad as the diameter of the 
eyes, in the female a little broader ; face retreating; frontal band blackish; beneath the frontal bristles 
the cheeks are beset with short hairs. Antenne black, the basal joints sometimes more or less rufous ; 
second joint bristly ; third joint nearly four times as long as the second; arista thickened on the proximal 
half. Proboscis black; palpi dark rufous. Thoracic dorsum with four black stripes—the intermediate 
stripes attenuated towards the head and but little prolonged behind the transverse suture, the outer 
stripes broader, less regular, and not reaching the anterior margin of the thorax, but running over the 
whole length behind the suture; pleure greyish. Abdomen yellowish-grey ; first segment black; on each 
of the second and third segments a pair of large black, somewhat reflecting, spots, which do not reach the 
anterior margin; anal segment rufous, with ochraceous tomentum on its front border; ventral face, 
except the anal segment, black, with the front margin of the second and third segments grey. Legs with 
many long bristles and hairs; foot-claws and pulvilli elongate in the male; the pulvilli brownish-grey. 
Tegule pale yellow. Wings greyish-hyaline; small cross-vein on the middle of the discal cell; apical 
and posterior cross-veins slightly curved. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
Several specimens of both sexes. 
BIOL, CENTR.-AMER., Dipt., Vol. II., February 1890. a 
