134 | DIPTERA. 
become rufous ; second joint with short bristles ; third joint brownish-black, three or four times as long 
as the second; arista thickened to near the middle, Proboscis and palpi pale rufous. Thorax and 
scutellum ochraceous ( ¢ ) or greyish-cinereous ( 9); on the thoracic dorsum four distinct black stripes— 
the intermediate ones linear, the outer ones interrupted at the transverse suture ; base of the scutellum 
black. Abdomen—{ ¢ ) elongate-oval, yellow ; first segment, except a small part of the lateral portions, 
black ; second segment with a large black dorsal spot, which laterally is extended to a narrow hind 
border, but does not reach the sides; third and anal segments with broad black hind borders; ventral 
surface rufous ;—( 2 ) ovate; first segment black ; the following segments greyish, the second and third 
with the hind borders (narrowly i in the middle, more broadly so at the sides) shining black ; anal segment 
pointed ; the ventral surface blackish. Coxee, femora, and tibie rufous, the tibiee more obscure ; tarsi 
black ; front tibiee with short bristles; middle and hind tibie with some long bristles. Tegule yellowish- 
white. Wings with a dilute brownish tint on the costal half, more hyaline on the posterior margin ; 
small cross-vein on the middle of the discal cell; third vein slightly bent upwards before its end ; 
curvation of the fourth vein with a somewhat rounded angle ; apical cross-vein very slightly concave ; 
posterior cross-vein distinctly undulate. 
Hab. Mexico, Sierra de las Aguas Escondidas 9500 feet in Guerrero (H. H. Smith). 
Two specimens, one of each sex. 
3. Myobia grata, sp. n., 
Yellowish ; frontal band, four thoracic ives, hind borders of the abdominal segments, antenne, and legs 
black ; posterior femora rufous at the base; discal and marginal macrochete present; posterior cross-vein 
straight. 
Length 5°5-7°5 millim. 
Head white ; front half as broad as the eyes: frontal band broader than the lateral portions; frontal bristles 
on each side in a single row, descending to the root of the antennex ; vibrisse inserted a little above the 
oral margin ; eyes descending to beneath the vibrisse ; beard consisting of some white bristles. Antenne 
shorter than the face; second joint bristly ; third joint three times as long as the second; arista thickened 
at the base. Proboscis black, with the terminal lips pale rufous; palpi pale rufous, very small. Thorax 
and scutellum yellowish-rufous ; thoracic dorsum with four black stripes, the intermediate of which are 
obsolete behind the transverse suture; base of the scutellum black. Abdomen subconical, convex, 
greyish, laterally yellow and transparent; first segment almost wholly black, as long as the following 
segments, which have black hind borders and discal as well as marginal macrochete, the black hind 
border of the second segment being limited to the dorsal part and that of the third segment laterally 
extended ; ventral surface yellow. Legs slender, black, the basal half of the middle and hind femora 
rufous; hind tibia with some rather long bristles, the other bristles of the legs weak; foot-claws and 
pulvilli of the front pair rather elongate. Tegule yellowish-white. Wings longer than the abdomen, 
brownish-grey ; small cross-vein on or somewhat before the middle of the discal cell; third vein bent 
upwards before its end; curvation of the fourth vein with a rounded angle; apical cross-vein very 
slightly concave ; posterior cross-vein straight, a little beyond the middle between the small cross-vein and 
the curvation of the fourth vein. 
Hab. Mzxico, Amula 6000 feet and Sierra de las Aguas Escondidas 9500 feet, both 
in Guerrero (H. H. Smith). 
A male specimen from each locality. 
4. Myobia scurra, sp. n., 3. 
Grey ; frontal band, four stripes and a large spot on the thorax, hind borders of the abdominal segments, and 
legs black ; palpi rufous; discal and marginal macrochaste present ; posterior cross-vein straight. 
Length 5°5-6 millim. 
Closely allied to the preceding species and resembling it in most respects. It differs, however, in the following 
