INSECUTOR INSCITI^ MENSTRUUS 121 



tachina vitinervis above), much less generic. The forms agree 

 closely in all other structural characters. The second aristal 

 joint is no longer than wide in any of the specimens including 

 the tibialis holotype, and a suggestion of the indentation of tip 

 of third antennal joint occurs in both sexes of tibialis. A 

 specimen from Colorado with obliterated fourth vein is other- 

 wise absolutely identical structurally with the tibialis series in 

 the U. S. Nat. Mus. collection. 



EuzENiLLiA aurea Townsend, 1912, Jour. N. Y. Ent. Soc, 

 XX, 111-12 equals Hypostena variabiIvIS Coq., 1895, Jour. N. 

 Y. Ent. Soc, III, 57. External adult characters to appear in 

 forthcoming paper. 



Clytia atra R. D., 1830, Myod., 288. Coquillett (Proc. 

 U. S. Nat. Mus., XXXVII, 572) has indicated this as one of 

 the Myiophasia group. This is highly improbable, since 

 Desvoidy defines his genus Clytia on preceding page as having 

 front broad in both sexes and records his specimen as male in 

 description of atra, whose form he characterizes as cylindrical. 

 Desvoidy cannot be considered as having mistaken a myio- 

 phasiine female for the male in this case, since the female can 

 not be described as cylindrical ; and the male in all of the 

 Myiophasia group has the eyes nearly contiguous. More- 

 over, it is practically inconceivable that Desvoidy should have 

 referred a myiophasiine fly to his genus Clytia. The cylindrical 

 form, broad male front, and shining metallic coloring strongly 

 suggest Lydina (Polidea Mcq., Somoleja Rdi., B. B.), but the 

 shorter antennae preclude this reference. 



Polistomyia Townsend, 1908, Tax. Muse. Flies, 132-3. In 

 1913 (Journ. N. Y. Ent. Soc, XXI, 147-8) I accepted Coquil- 

 lett's designation of Thereva plumipes Fab. as type of 

 Trichiopoda Latr. (Proc. U. S. Nat. Mus., XXXVII, 616). It 

 appears, however, that the type selections made by Brauer and 

 Bergenstamm in their classical work, "Vorarbeiten zu einer 

 Monographie der Muscaria schizometopa (exclusive An- 

 thomyidae)" (Parts I to IV, Wien, 1889-1894), must hold as 

 valid designations, provided only that the selected species are 

 among those originally included in each case, and that no 



