100 AMERICAN HYMENOPTERA. 



Genus ATHYREODON Ashm. 

 Athyreodon Ashmead, Proc. U. S. Nat. Mus., No. 1206, p. 87, n. 



645 (Vol. XXIII, 1901) 1900. 



Faun. Hawaiiensis, Vol. I, Part 3, p. 343 1901. 



Tipulophiott Kriechbaumer, Zeitschr. Hym. Dipt., I, p. 75, March 



1 1901. 



Athyreodon Ashmead, Faun. Haw., I, p. 343, August 1 1901. 



Dalla Torre, Cat. Hym., Ill, p. 185 1901. 



Tipulophion Schulz, Zeitschr. f. Syst, Hym. Dipt., Ill, p. 252 1903. 



Macrophion Szepligeti, Gen. Ins., Hym., 34me Fasc, p. 32 1905. 



Tipulophion Schulz, Spolia Hym., p. 97, n. 186., 1906. 



Macrophion Schmiedeknecht, Opusc. Ichn., XVIII, p. 1420 1908. 



Ocelli large, close to the tops of the eyes ; wings without stigma ; dis- 

 cocubital vein arcuate, not appendiculate ; nervellus broken above the 

 middle ; antennae long, filiform ; claws pectinate. 



Generic type. — A. atriventris Cress. 



The members of this genus are closely related to those of 

 Thyreodon, but may be readily recognized by their large 

 ocelli. These vary slightly in size, but are always much 

 larger than in Thyreodon and considerably larger than in 

 Ophion. In some species the ocelli are close to each other 

 and also to the tops of the eyes, almost filling this space ; in 

 others they are well separated from each but near the eyes. 

 The other characters are as in Thyreodon. This difference 

 from members of the Genus Thyreodon has been recognized 

 by three different workers, and, strange enough, in the same 

 species, atriventris, though none of the three recognized this 

 fact ; each proposed a new genus and described his species 

 as new. It will, therefore, be readily seen that there is some 

 variation within this species. The size of the fuliginous 

 spots in the wings varies, at least in atriventris, and probably 

 in other members of the genus, but how widely is not known. 

 Dalla Torre's statement that Athyreodon is mentioned in the 

 Transactions of the Entomological Society of London, p. 87, 

 1900, is a mistake, and he evidently confused it with the Pro- 

 ceedings of the U. S. National Museum. No. 1206, p. 87, 

 1900. 



Distribution. — The members of this genus are apparently 

 tropical with a wide distribution from Mexico to southern 

 Brazil, including the West Indies. A. atriventris xSingQS over 



