ZENILLIA AND ALLIED GENERA — SELLERS 39 



celia Robineau-Desvoidy, Parexorista Brauer and Bergenstamm 

 (=Senexorista Townsend), and {Eucarcdia Baranoff)= Seno- 

 metopia Macquart sensu Townsend] as being applicable to both 

 realms. As the writer is impressed by the close resemblance of 

 some of the species of the Nearctic and Palearctic regions, the prob- 

 able value of the Palearctic genera Tricarcelia, Senometopia, Carcelia, 

 Paraexorista, Euryclea, and Isocarelia should be considered. To 

 apply Baranoff's table beyond Tricarcelia, Garcelia amplexa with 

 its variable characters of three or four dorsocentral macrochaetae, 

 inner ventral bristle of the midtibia weak or wanting, and with or 

 without discal macrochaetae, would cause considerable trouble with 

 the proposed classification. After the division made on the absence 

 or presence of an inner ventral bristle on the midtibia, the main sub- 

 divisions of the classification are based on male characters later re- 

 verting to female characters to establish the validity of the genera 

 (Pelmatomyia)=Euryclea and Isocorcelia. It is a doubtful pro- 

 cedure to recognize genera established on sexual characters only, and 

 it is the writer's opinion that Euryclea and Isocarcelia should not be 

 given even subgeneric recognition. In (Eucar celia)— Senometopia 

 with the hind coxa without small bristles behind at the apex, the 

 abdomen may be with or without discal macrochaetae; while in the 

 alternative bracket with the hind coxa with small bristles behind at 

 the apex, the classification is divided into Garcelia without discal 

 macrochaetae and Parexorista with discal macrochaetae. 



Apparently Baranoff's restricted genera utilized in his treatment 

 of the Carcelia complex were not available in time for incorporation 

 in Townsend's Manual of Myiology. Townsend places his genera 

 concerned in three different tribes. Townsend's designation of Car- 

 celia laxifrons Villeneuve as the genotype of Paraexorista cannot be 

 accepted, as Exorista cheloniae Rondani was the monotypic example 

 when Brauer and Bergenstamm proposed the genus Paraexorista. 



The Palearctic concepts of the genus Carcelia are fairly well agreed 

 upon. Nearly everyone has accepted Villeneuve's idea of the genus 

 that it forms a natural group. The accepted disposition has been 

 to place ail "Exorista" (s. 1.) species having two sternopleural macro- 

 chaetae and hind tibiae ciliate in this genus. The more pertinent and 

 diagnostic characters of eye high and jowl or gena linear have not 

 been given trie prominence they deserve. The last-mentioned char- 

 acters have been used in this paper to place the genus Carcelia on a 

 stronger systematic basis. It has been necessary to broaden the 

 concepts of the genus to allow for the inclusion of forms having three 

 sternopleural macrochaetae. Aldrich and Webber distributed their 

 species of Carcelia among three of their subgenera; their subgenus 

 Parexorista is too broad to be usable. Some European authorities 



