ZENILLIA AND ALLIED GENERA — SELLERS 51 



Zenillia protuberans of Schaffneb and Griswold (hoc Aldrich and Webber), 

 U. S. Dept. Agr. Misc. Publ. 1S8, p. 112, 1934. 



Paraeoeorista protuberans of Schaffneb and Griswold (nee Aldrich and Web- 

 ber). — Townsend, Manual of myiology, p. 4, p. 213, ll»3(3. 



Garcelia cheloniae Rondani does not occur in the Nearctic realm. 

 The previous use of the name as applied to the Nearctic fauna has 

 been one of mistaken identity. 



Garcelia malacosomae, a Nearctic species, and Care J la laxifrons, 

 an introduced and established Palearctic species, constitute a classical 

 gem in the resemblance of species of these two realms. They have 

 been considered morphologically inseparable by specialists of the 

 family for the past three decades, principally under the name of 

 cheloniae. The resulting confusion, coupled with the initial mis- 

 identification of the species, has provoked considerable argument and 

 produced many interesting theories, some of which can well be dis- 

 pensed with. Although the controversy is probably far from ended, 

 it has afforded the writer considerable satisfaction in being able to 

 clear up much of the existing confusion, and to define the status of 

 these two species. 



Head with front of male at narrowest 0.27 to 0.28 (in five speci- 

 mens) and in female 0.30 to 0.33 (in five specimens) of head width; 

 frontal row of the usual 10 to 12 bristles in the male and 6 to 8 in 

 the female, extending from at least on a level with insertion of arista 

 to two reclinate upper frontals (preverticals) ; facial lidge usually 

 bristly on more than lowest one-fourth, often ascending to near 

 middle, especially in males; gena one-fifteenth or less eye height; 

 frontal orbit and face silvery gray pruinose; parafacial bearing a 

 few discernible hairs on upper side just below frontals, these hairs 

 rarely absent; antenna black, third segment three times second; arista 

 thickened on basal one-fourth, penultimate segment short; palpus 

 yellow. 



Thorax varying from reddish brown on sides to black on dorsum, 

 gray pollinose, usually marked with five discernible mesonotal vittae ; 

 four postsutural dorsocentral macrochaetae; scutellum testaceous 

 thinly covered with pollen, three pairs of marginal scutellars and 

 one strong decussate apical pair turned backward, disk covered with 

 erect hairs and bearing one pair of discal scutellars ; two sternopleu- 

 ral macrochaetae; femora and tibiae yellowish brown, tarsi black; 

 front tibia with two posterolateral bristles; midtibia bearing two or 

 more median anterolateral bristles, one long bristle about the middle 

 with one or more above, with usually none below but when present 

 very small; midtibia with one inner ventral bristle; hind tibia 

 ciliate, with one longer bristle. 



Abdomen blackish, covered, including hind margins, with gray 

 pollen, without sheen, sides yellowish red in male, black in female; 



