AKT. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 35 



Wings grayish; third vein straight; fourth vein nearly straight; 

 parallel with third; last section of fifth vein tAvice as long as the 

 crossvein. 



Female. — Face wider; palpi yellow, blackened on basal half; first 

 antennal joint with several hairs above; first abdominal segment 

 yellow, otherwise the abdomen as in the mal^; pleurae, coxae, legs, 

 feet and wings about as in the male. 



Described from one pair taken near Plummer Island, Maryland, 

 the male on May 21 and the female on June 2 ; nine males and three 

 females taken by Dr. J. M. Aldrich, at Lafaj'ette, Indiana, June 9 

 to July 19; and one female taken by him at Turkey Run, Indiana, 

 August 20. 



Paratypes.—Y^oih. sexes, 12, Cat. No. 27049, U.S.N.M. 



30. ARGYRA FLAVICORNIS. new species 



Male. — Length, 3 mm. Face rather narrow, silvery white. Front 

 covered with white pollen, still the green ground color shows 

 through. Palpi and proboscis reddish-j-ellow. Antennae (fig. 25) 

 yellow ; first joint with three or more hairs above and a few minute 

 ones below near the tip; third joint narrowly black above, longer 

 than the basal two taken together, rounded at tip; arista black, 

 scarcely as long as the antenna, inserted near apical third of third 

 joint. Lower orbital cilia short and sparse, yellowish. 



Dorsum of thorax and the scutellum dark shining green, with a 

 little pollen along the front; the scutellum with one pair of widely 

 separated marginal bristles. First four segments of the abdomen 

 yellow with their hind margins black; apical segments black with 

 green reflections, still the fifth is narrowly yellow on its sides at 

 base; hairs of the abdomen yellow, a few of the bristles on the sides 

 of the hind margin of first segment are black. Hypopygium (fig. 

 26) more testaceous than black, its appendages yellow; the outer 

 lamellae broad, somewhat triangular in outline, yellow with black 

 dots at the root of the hairs on its disk ; inner appendages are a pair 

 of large clavate organs and a pair of slender shorter ones, the central 

 filament is conspicuous in the type specimens. 



Coxae, legs and feet wholly yellow, coxae with only short yellow 

 hair and no bristles, except one erect black one on hind coxae and 

 several very small black ones near the tip of fore coxae ; femora and 

 tibiae Avith very short black hair. Joints of fore tarsi as 37-10-8-5-7. 

 Joints of posterior tarsi are as 30-28-17-11-8. Calypters yellow 

 with a small brown spot at tip and black cilia. Halteres yellow. 



Wings slightly grayish; veins yellow; third vein bent backward at 

 tip; last section of fourth vein only a little bent before its middle, 



