ZENILLIA AND ALLIED GENERA — SELLERS 11 



2. ZENILLIA FUTILIS (Osten Sacken) 



Exorista futilis Osten Sacken, Can. Bnt., vol. 19, p. 161, 1887.— Williston, 

 Scudder's Butterflies of Eastern United States and Canada, vol. 3, p. 1917, pi. 

 89, fig. 10, 1889.— Coquillett, U. S. Dept. Agr., Div. Ent., Tech. Bull. 7, p. 98, 

 1S97 _Smith, Catalogue of New Jersey insects, p. 780, 1909.— Gibson, Ann. 

 Rep. Ent. Soc. Ontario, 1912, p. 133.— Tothtll, Can. Ent., vol. 45, p. 71, 1913 — 

 Greene, Proc. U. S. Nat. Mus., vol. €0, art. 10, p. 32, pi. 19, fig. 93 (puparium), 

 1922. 



Euexorista futilis (Osten Sacken) Townsend, Proc. Ent. Soc. Washington, vol. 

 14, p. 166, 1912 ; Manual of myiology, pt. 4, p. 249, 1936. 



Zenillia futilis (Osten Sacken) Axdrich and Webeee, Proc. U. S. Nat. Mus., vol. 

 63, art. 17, p. 42. 1924.— Johnson, List of New England Diptera, p. 196, 1925 ; 

 Proc. Boston Soc. Nat. Hist., vol. 38, p. 87, 1925.— Essig, Insects of western 

 North America, p. 581, 1926.— Learned, Bull. Brooklyn Ent. Soc, vol. 22, p. 

 219, 1927.— West, Cornell Univ. Agr. Exp. Stat. Mem. 101, p. 814, 1928.— 

 Aldeich, Proc. U. S. Nat. Mus., vol. 80, art. 20, p. 3, 1932.— Schaffner and 

 Griswold, U. S. Dept. Agr. Misc. Publ. 188, p. 112, 1934. 



Head with front of male at narrowest 0.29 to 0.30 (in five specimens) 

 and of female 0.31 to 0.33 (in five specimens) of head width; frontal 

 row of seven to nine bristles, rarely six in some females, extending 

 from on a level with insertion of arista to two reclinate upper frontals 

 (preverticals) ; facial ridge bristly on lowest one-fourth; gena one- 

 sixth eye height; frontal orbit and parafacial golden or yellow - 

 pollinose; antenna black, third segment in the male three and one- 

 third and in the female two and two-thirds times second ; arista thick- 

 ened on basal one-fourth, penultimate segment short. 



Thorax black, gray-pollinose marked with five mesonotal vittae; 

 four postsutural dorsocentral macrochaetae ; scutellum black with 

 three pairs of marginal scutellars and one decussate apical pair turned 

 backward, one pair of discal scutellars; three sternopleural macro- 

 chaetae ; midtibia with three median anterolateral bristles, sometimes 

 more in female, one inner ventral bristle; hind tibia more or less ciliate 

 with two longer bristles. 



Abdomen black, gray-pollinose, fourth segment golden ; first and sec- 

 ond segments with pair, third and fourth with a row of marginal 

 macrochaetae ; row of discal macrochaetae on fourth segment only ; ab- 

 dominal dorsal vitta obscurely marked. 



Hypopygium black, gray-pollinose, inner and outer forceps of equal 

 length ; the inner curving slightly inward, shining black, and densely 

 clothed with long fine hairs ; the outer very slender and tapering to a 

 fine point. 



Length 6.5 to 11 mm. 



Distribution ".—Maine 3, New Hampshire 1, Vermont 2, Massachu- 



u Under "Distribution"' the numbers following the names of the States indicate the 

 number of localities from which specimens have been examined. In the case of published 

 records, they indicate the number of localities mentioned in addition to those from which 

 specimens were examined. The use of the numbers enables one to visualize the centers of 

 distribution as well as the fringes of the areas involved. 



