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Genus Wyeomyia, 
from Rio were all females. It can at once be told from all other 
Wyeomyias by the semicircular dark band of scales on the nape. 
The species is very bright when fresh, and the golden-yellow 
apical lateral spots and venter of the abdomen are characteristic. 
7. Wyeomyia (?) micropterus. Giles. 
“ Wings unspotted, tarsi unhanded; thorax dorsally unadorned, hut 
with white spots on the pleurae. Abdominal segments black, with white 
basal bands expanding into lateral spots, and a distal fringe of yellowish 
hairs. Wings proportionately very small. 
“ Head black, with a pair of snowy spots on the nape, especially 
distinct in the male. Antennae black, the plumes of the male having a 
very marked silvery reflection in certain lights. Palpi black, longer than 
the proboscis by rather more than the length of the terminal joint, very 
minute in the ? . Proboscis black, with a distinct but minute white or 
yellowish tip. 
“ Thorax with a black ground, covered with a bronzy tomentum and 
a number of strong bristles, which become especially marked along the 
posterior border of the scutellum, which is armed with a median and a 
pair of lateral tufts of strong bristles nearly as long as the first two 
abdominal segments. There are some snowy spots on the pleurae, and a 
tendency to longitudinal ornamentation of the dorsum, but not sufficiently 
contrasted to catch the eye. Wings markedly shorter than the abdomen, 
hyaline with densely black scaled veins. Auxiliary vein joining the 
costa about the level of the middle transverse vein, which is placed a long 
Wing of $ Wyeomyia (?) micropterus. n. sp. 
(After Giles.) 
way outside the posterior transverse, especially in the male; fork-cells 
short with long equal stems; the posterior being shorter and wider than 
the anterior, supernumerary and middle transverse veins in one line. 
Halteres light yellow with darker knobs. Legs short and stout, almost 
uniformly black save for the femora below, a minute knee spot and a tiny 
band at junction of tibia with first tarsal joint, yellowish-brown. Hind 
tibia about the same length as the first tarsal joint. Abdomen black, 
with a very narrow basal snowy band (which often disappears on drying), 
expanding laterally into distinct spots; and with a fringe of yellowish 
