DIPTEKA. 275 



DIPALTA (p. 98). 

 Coquillett is of opinion that the name Dipalta should be suppressed and the 

 species united with Anthrax, on the ground that the cross-vein uniting the anterior 

 branch of the third with the second is adventitious. I have seen many specimens of 

 D. serpentina from various regions of the United States and Mexico, but never one 

 with the cross-vein wanting. I am not prepared to reject the genus, though, as I have 

 remarked before, I am not satisfied of its distinctness from Diploeampta, Schiner, 

 notwithstanding the remarks of Osten Sacken. Even though the cross-vein should be 

 wanting, the peculiar shape of the second vein is characteristic. 



Dipalta serpentina (p. 98). 



To the localities given, add : — Mexico, Amula in Guerrero (H. H. Smith), Atoyac in 

 Vera Cruz (Schumann). 



Six specimens. 



ARGYKAMCEBA (p. 98). 



The genus Spogostylum, Macquart [Dipt. Exot. ii. 1, p. 53 (1840)], has twenty years' 

 priority over Argyramoeba, Schiner, from which it merely differs in having three 

 submarginal cells formed in the usual way — that is, by a cross-vein connecting the 

 anterior branch with the second vein : Schiner suspected that they were synonymous *. 

 Coquillett has referred North-American species to Spogostylum, in which the third cell 

 was formed by the division of the outer submarginal cell, or, as he describes it, by the 

 presence of a cross-vein connecting the anterior branch of the third vein with the third 

 vein, which is quite another thing. Abnormal specimens of Argyramoeba with three 

 submarginal cells are not rare. 



Argyramoeba simson (p. 100). 



To the localities given, add : — Mexico, Amula in Guerrero (H. II. Smith). 



Argyramoeba acroleuca (p. 101). 



To the localities given, add .-—Mexico, Atoyac in Vera Cruz (H. H. Smith). 

 Argyramoeba oedipus (p. 102). 



To the localities given, add: — Mexico, Northern Yucatan (Gaumer). 



10. Argyramoeba angustipennis. 



? Anthrax angustipennis, Macq. Dipt. Exot. ii. 1, p. 64, t. 21. fig. 9\ 

 Hab. Mexico, Acapulco in Guerrero (//. II. Smith). — Guiana 1 . 



A single specimen from Acapulco, without head, may be a variety of this species. The 



* Eeise der Novara, Dipt. p. 120. nota. 



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