SO THE CANADIAN ENTOMOLOGIST. 



SYNOPSIS OF THE ASILID GENUS DIOCTRIA. 



BY D. W. COQUILLETT, LOS ANGELES, CAL. 



The following table includes all the species of Dioctria known to me 

 as occurring in North America : — 

 i. Wings on the basal half yellow, on the apical half blackish 2 



Wings not marked like this, nearly uniformly blackish 3 



2. Legs wholly black ; length, 4 mm .parvulus, n. sp. 



Legs partly reddish-yellow ; length, 7 mm Sackenii, Will. 



3. Abdomen wholly black 4 



Abdomen and legs partly reddish 6 



4. Legs wholly black 5 



Legs having base of tibiae broadly reddish-yellow ; mystax black 



?iitida, Will. 



5. Mystax black albius, Walk. 



Mystax red resplendens, Lw. 



6. Antennal style nearly half as long as the third joint, coxae red 



pusio, O. S. 



Antennal style one-sixth as long as the third joint, coxae black 



rubidus, n. sp. 



Dioctria parvulus, n. sp. $ . 



Wholly black, shining. Pile of head light yellow, that on sides of 

 face very sparse, extending to base of antennae. First two joints of 

 antennae subequal in length, the third joint as long as the first two taken 

 together ; style one-sixth as long as the third joint, thick and blunt. 

 Pile of thorax rather abundant, that on abdomen very sparse and short,, 

 bright yellow. Base of wings to beginning of fifth posterior cell yellow- 

 ish-white, beyond this blackish ; all posterior and the anal cell open. 

 Length, 4 mm. Los Angeles County, Cal. Two specimens. 

 Dioctria rubidus, n. sp. $ . 



Head black, the pile light yellow ; face with a large fovea above the 

 centre, below which is a large gibbosity bearing the rather dense mystax ; 

 face covered with a very short, brassy yellow pubescence, and with a few 

 pile on each side above. Antennae black, first joint one and a-fourth 

 times as long as the second, the third joint slightly longer than the first 

 two taken together, the style one-sixth as long as the third joint, very 

 robust, its tip blunt. Thorax and scutellum shining black, quite thickly 

 light yellow pilose. Abdomen shining reddish-brown, except the first 

 segment which is black, but sometimes the second segment and a large 

 portion of the third and fourth segments are also black ; pile very sparse 

 and short, light yellow. Legs yellowish, the coxae, trochanters, apical 

 three-fourths of hind tibiae, and sometimes also of the other tibiae, and all 

 the tarsi, black. Wings blackish, all posterior and the anal cell open. 

 Halteres yellow. Length, 7 mm. Los Angeles County, Cal. Three 

 specimens. 



