6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 80 



The species identified as fedestns by Coquillett was described by 

 Townsend as Meigenielloides cinerea}'^ As Townsend did not con- 

 nect his species with that of Coquillett, I failed to observe that they 

 were the same, and redescribed it as Synoris coquilletti.^^ No other 

 species of the genus is known. 



Dexia pristis Walker, List, p. 841. Coquillett (p. 64) placed 

 the species in Macquartia, following an identification by Brauer 

 and Bergenstamm. Before seeing the type I had accepted Coquil- 

 lett's identification of the species, but had removed it from Mac- 

 quartia to the genus P&eudeuantha^ which Townsend ^^ had erected 

 for linelli^ new, from Mexico. An examination of the type showed 

 that Coquillett had identified it correctly, Brauer and Bergen- 

 stamm erred, however, in the genus to which they assigned the speci- 

 men sent them for identification. Townsend did not accept 

 Coquillett's species as the true pristis; in 1892 he had described it as 

 Aporia Umacodis, and he later ^^ made this the type of the new genus 

 Anaporia. This genus I do not consider distinct from Pseudeuantha. 



Tachina areos Walker, List, p. 766. Placed in Polidea by 

 Coquillett (p. 64), a genus now regarded as synonymous with Lydlna 

 Itobineau-Desvoid}^ Townsend had in 1892 described Tryphera 

 americana^ T. polidoides^ and Polidea cmiencana in a single paper ^^ ; 

 all these Coquillett placed as synonyms of areos. In my Catalogue 

 of North American Diptera,^^ I separated Tryphera americana Town- 

 send as a distinct species of Polidea^ from an examination of the 

 type. 



As I did not see Walker's type, and as the large collection available 

 for study shows much variation among the specimens, I can at present 

 only indicate the nature of the problem here. There appears to be in 

 Europe only one species of Lydina., the genotype, aenea Meigen. It 

 differs from the common form in this country most obviously in 

 having black palpi. I had regarded this as a sufficient distinction 

 for areos until obliged to review the matter for the present paper. T 

 now find that Walker stated that areos has " palpi black." There is 

 now in the National Museum a series of five males and three females 

 of Lydina., collected by me at Hammond, 111., June 24, 1915, all of 

 which have black palpi; there is also a female from Viola, Idaho, 

 collected by me. A male and a female of aenea from Italy (Bezzi) 

 show some differences, but hardly more than our series shows within 

 itself. If the black palpi are specific, and our specimens with that 

 character belong to aenea., then Walker's areos is probably a synonym, 



"Troc. U. S. Nnt. Mus., vol. 56, p. 574, 1910. 



«Proc. U. S. Nat. Mus., vol. 69, art. 22, p. 12, 1926. 



" Proc. U. S. Nat. Mus., vol. 49, p. 416, 1915. 



1' Proc. U. S. Nat. Mus., vol. 56, p. 560, 1919. 



" Can. Ent., vol. 24, pp. 78, 79, and 82, respectively, 1892. 



" Smithsonian Misc. Coll., vol. 46, no. 1444, p. 436, 1905. 



