ART. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 33 



27. ARGYRA ALDRICHI Johnson 



Argyra aldricM Johnson, Psyche, vol. 10, p. 18, 1904 ; also a note in Psyche, 

 Tol. 13, p. 60. 



Male. — Length, 4.5 mm. Face and front silvery white, the former 

 moderately wide. Palpi and proboscis yellow. Antennae black; 

 first joint conspicuously bristly above; third joint only slightly 

 longer than the basal two taken together; arista apical, about as 

 long as third joint. Lateral and inferior orbital cilia white, the 

 small black upper cilia white; the small black upper cilia reach 

 down only to the upper fourth of the eye height. 



Dorsum of thorax dark shining green, without white pollen, ex- 

 cept on the humeral angles, which are thickly covered with the 

 silvery white pollen ; scutellum witFf two pairs of marginal bristles. 

 First three abdominal segments yellow, first widely black in the 

 center above, second and third narrowly black on hind margin; 

 fourth segment with a little more than basal half yellow, remainder 

 of fourth and the whole of fifth and sixth black; all segments with 

 extreme apical margin white; the hairs on the abdomen small and 

 black ; still they appear yellowish in certain lights, long bristles on 

 upper portion of first segment black, but there are long yellow hairs 

 on the lower part of the sides. Hypopygium (fig. 19) with upper 

 part testaceous, lower portion shining black, it is constricted in the 

 middle, the apical part being nearly globular ; its outer lamellae long, 

 curved, brown, fringed with hairs. 



All coxae, posterior margin of pleurae, femora, and tibiae wholly 

 yellow. Bristles of coxae black. Fore and middle femora with 

 short yellow hairs below. Fore tarsi mostly yellow, lower edge of 

 second joint a little hollowed out and with a bunch of short spines 

 at base : joints of fore tarsi as 50-17-14-15-12 ; joints of middle tarsi 

 as 5S-30--20-13-10; hind tarsi wholly black, their joints as 40-43- 

 29-17-10. Calypters, their cilia and the halteres pale yellow. 



Wings gray ; last section of fourth vein bent near its middle ; it is 

 nearly parallel with third and ends just back of the apex of the 

 wing; last section of fifth vein not quite twice as long as the cross- 

 vein. 



Female. — Face about twice as wide as in the male; palpi large, 

 yellow; third antennal joint not quite as long as the basal two to- 

 gether. Thorax, coxae, legs, and feet colored as in the male; ab- 

 domen yellow with narrow black margins on the first four segments, 

 fifth wholly black. Wings as in the male. 



Redescribed from two males and one female taken by C. W. John- 

 son, the males were taken at Buttonwoods, Rhode Island, June. 

 1912,; the female at Bristol, Rhode Island, June 21, 1918. The type 



