JOHXSOX—DESCRIPTIOXS OF TiFO XEU’ DIPTERA 
59 
1906] 
DESCRIPTIOXS OF TWO NEW DIPTERA OF THE FAMILY 
DOLICHOPODIDAE. 
BY CHARLES \V. JOHNSON. 
Leucostola slossoitac n. sp. 
Face very narrow, linear, whitish, oral portion hlack, front and vertex 
green, shining, bristles large: occiput green, with a row of small hlack bristles 
above near the orbits and a shorter parallel row behind, the lower half hearing 
long, silvery, white hairs ; antennae black, third joint conical, length about 
equal to the first and second taken together. Thorax and scntellum a shining 
metallic green, with long hlack bristles, the four on the scntellum widely 
se])aratcd; ])lurae green, covered with a whitish ])ollen, prostigma yellow. 
.\bdomen green, shining, with short hlack hairs, base of the second, third, 
fourth and fifth segments a dark metallic bronze, sides of the second, third and 
fourth segments, with a spot of whitish pollen at the posterior angle, sixth 
segment a metallic blue-black, hypopygium dark green, lamellae brown, very 
long and filiform. Legs yellow, the upper side of the front and 
tips of the posterior femora, tips of the front and middle tibiae, tips of the 
posterior metatarsi and the entire tarsi black, coxae greenish, with a 
thin whitish bloom and white hair on the front and middle pairs, each of the 
middle coxae bears a prominent black spine, end of the front metatarsi dilated 
and forming a knob-like projection below. Wings with a slight brownish 
tinge, tegulae yellow, cilia white, halteres yellow. Length 6.3 mm. Type m 
the New England collection of the Boston .Society of Natural History. 
One specimen collected on Mt. Washington, X. II., by Miss .\nnic T. 
Slosson, during the summer of 1903. The absence of hairs on the first joint of 
the antennae and short transverse second joint, bars this s])ecies from the genus 
Ar^yra. On the other hand, the long lamellae, coxal spines, and dilated front 
metatarsi makes its position under Leucostola only tentative, until more material 
is obtained. 
Argyra robusta n. sp. 
Face and front black, covered with a dull, grayish ])ollcn, face broad with 
an irregular transverse ridge, depressed above with a slight tubercle below the 
