ART. 17. NORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 37 



3ix times as long as the second, arista thickened on the basal two- 

 fifths, penultimate joint short. Thorax black, gray pollino.se, marked 

 with four black vittae; four dorsocentral macrochaetae ; scutellum 

 black, with three long and one short apical pair of bristles. Sterno- 

 pleura with three bristles. Abdomen black, subshining, the bases of 

 the last three segments gray pollinose; discal macrochaetae present 

 on the last three segments, the abdominal hairs rather long and 

 erect. Legs black, the mid tibiae with one bristle on the outer front 

 side near the middle; hind tibiae weakly ciliate. Wings with a 

 light tinge of brown throughout, deeper at the base and along the 

 costa. 



Length 7mm. 



Described from a single male specimen. Mount Washington, New 

 Hampshire (Mrs. Slosson). 



7Vp^.— Male, Cat. No. 3753, U.S.N.M. 



Subgenus Eusisyropa. 



ZENILLIA BLANDA Osten Sacken. 



Exorista hlanda Osten Sacken, Canad. Ent, vol. 19, 1887, p. 162. — Willis- 

 ton, in Scudder's Butterflies of New England, vol. 3, p. 1918, pi. 89, fig. 11. 



Exorista hlanda proserpina Wh-liston, in Scudders's Butterflies of New 

 England, vol. 3, p. 1919. 



Exorista hypenae Coquillett MS., Howard, Bull. 7. new ser.. Bur. Enr., 

 1897, p. 47.— Hawley, Memoir 15, Cornell Univ. Expt. Sta., 191S, p. 196. 



Eusisyropa hlanda Townsend, Smiths. Misc. Colls., No. 1803. 1908, p. 97. 



Exorista hoarmiae Coquillett, Revis. Tacliin., 1897. p. 95. — Howard and 

 FisKE, Bull. 91, Bur. Ent., 1911, p. 145.— Beimlev, Ent. News, vol. 33, 

 1922, p. 22.— Greene, Proc. U. S. Nat. Mus., vol. 60, Art. TO, p. 11. fig. 25 

 (puparium). 



This variable species has discal macrochaetae, and a single bristle 

 on the outer front side of the middle tibia ; it has either three or four 

 dorsocentrals ; two sternopleurals or two and a small below ; femora 

 either reddish-yellow or black; apical scutellars turned either upward 

 or backward. 



The typical form was described as hoarmiae. new species by Co- 

 quillett in his revision; but his hlanda also comes within the limits 

 of variation of the species. 



In this complex group one set of males are readily distinguishable, 

 liut we can not separate the corresponding females: hence we let this 

 form stand as a subspecies. Prolonged effort has not resulted in the 

 separation of any other forms by constant characters, however slight. 



TABLE OF SUBSPKCIBS — M.4.LES. 



Abdomen with the pollen of the third and lourtii tergites <(.ntinuing on the 

 venter; inner forceps rather thick apically. the last fiftli heiit at an <)l)linno 

 angle, tl)e back witli long hair to tlie bend: femora l)lack ov yellow. 



blanda Oston Sacken. 



