ART. 17. NORTH AMERICAN PHOROCERA — ALDRKJH AND WEBBER. 67 



deeply cleft, the sides projecting toward each other some distance 

 from the base. Legs black, middle tibia with two bristles on tlie 

 outer front side; hind tibia w'ith an uneven row of bristles on the 

 outer side. Wings hyaline with fourth vein bent at a right angle, 

 and with a very slight fold; the apical cell rather widely open; 

 third vein with scA^en })ristles at base reaching half way to the 

 small crossvein. 



Length 9 mm. 



One male, Billy Island, Okefenokee, Georgia, June, 1912 (Cornell 

 University Expedition). 



7V;;f.— Male, Cat. No. 25714, U.S.N.M. 



Subgenus Patelloa. 



PHOROCERA LEUCANIAE Coquillctt. 



Phoroccra Iciuxuiiae Coquillett, Revis. Tachin., 1897, p. 104. 



Patelloa leucaniae Townsend, Proc. U. S. Nat. Mus., vol. 49, 1916, p. 619. 



Front of male 0.260 and in the female 0.30 (average of three, 0.30, 

 0.29. 0.32) the head width; parafrontals yellowish pollinose, the 

 frontal bristles in a single row^ descending to the arista, two upper- 

 most ones stout and reclinate, the sides clothed with fine incon- 

 spicuous hairs : face slightly yellowish pollinose, ridges bristly four- 

 fifths of the way up; bucca one-fourth the eye height: palpi and 

 proboscis yellow; antennae black nearly as long as the face, the 

 third joint in both sexes four times the length of the second; 

 arista thickened on the basal fourth, penultimate joint short. 

 Thorax gray pollinose, marked with four black vittae and bearing 

 three dorsocentral macrochaetae ; scuteilum grayish pollinose with 

 four pairs of marginal bristles, the apical pair directed backward, 

 there is also one pair on disk. Sternopleurae with three bristles. 

 Abdomen thick, the fourth segment Avedge-shaped, wliolly covered 

 with gray pollen, anal segment j^ellowish pollinose, sometimes a j'el- 

 lowish spot on the sides of the intermediate segments; first two 

 segments usually bear a pair each of marginal macrochaetae, some- 

 times a pair of weak discals on the second; third with a marginal 

 row and with or without discals, fourth with two rows one half-way 

 the other at apex; bristly hairs of the abdomen depressed in both 

 sexes. Legs brownish black, tibiae often brown, mid tibiae bearing 

 a single bristle on the outer front side near the middle, hind tibiae 

 outwardly ciliate with one longer bristle. Wing hyaline, apical 

 cell open, fourth vein strongly arcuate l)eyond tlie bend, base of 

 third vein with two bristles. Ovipositor concealed usually, but 

 Avhen visible it has no strongly chitinized process. 



Length 10 to 11 mm. 



Redescribed from the type specimens, frojn District of Columbia, 

 Tennessee, and Kentucky, bred from Clrphis unipuncta Hawortli 



