220 



NOTES. 



crossvein is short and may be easily overlooked. The wings are very 

 narrow; the body delicate, the legs long and very slender; empodia 

 distinct. 



D. mirabilis n. sp. About 6 mm. long, brownish, very slender, 

 with Ions, exceedingly delicate, white legs; the tips of the femora and 

 of the tibiae, brown. — Georgia; Texas. 



I am not able, at present, to give a better description of this 

 species; still, its characters are to striking that it will be easily 

 recognized. I first took it in Georgia, in 1858, and did not publish 

 it, not knowing where to place it. Later, I sent it to Dr. Loew and 

 did not have it before me at the time of the publication of Monographs, 

 Vol. IV. During my visit to Dr. Loew in 1877 , I saw the specimen 

 again and took down a few notes about its characters, thinking that it 

 was related to Thanmastojotera Mik. But I have seen the latter in 

 Viinna since and have given up all idea of a relationship. 



The type of D. viirahilis is now in the Mus. Comp. Zool. in 

 Cambridge, Mass. I have seen a second specimen, apparently of the 

 same species, taken by Mr. Boll in Texas. A specimen from Cuba in 

 Mr. Loew's collection also seems to belong here. 



The name Diotreplia means fed hy the Gods. 



29. Rhypholophus fascipennis Zett. According to Dr. Stein, who 

 quotes Loew in Hit., this may be the same as the E. phryganopterus 

 of Kolenati (Stein, in Stett. Ent. Zeitschr. 1873, p. 241). 



30. Erioptera The characters of the subdivisions , established by 

 me in this genus were explained in the Monogr. IV, 151 — 152. In 

 their application to species from other parts of the world than North 

 America, some of them will hold good, others will require to be remodelled. 

 The subgenus Erioptera maintains all its characters in the european species 

 tcienionota M., flavescens F., fuscipennis M. (as I saw them named in Mr. 

 Kowarz's collection). EiiojHei'a macuJata M. is a true Acyphona, agreeing 

 in all generic characters with the american species of that subdivision. 

 The definition which Dr. Loew gives of Acyphova (Beschr. Europ. Dipt. 

 Ill, 50) is incomplete and therefore misleading; he evidently based it on 

 my statements in Monogr. Vol. IV, p. 158 only, and overlooked 

 the detailed character of the subgenus, as given on p. 151 — 152. His 

 Acypjhonae therefore, are not Acypdionae in my sense at all. Molopltilns 

 is a very well-defined form , existing in Europe and North America. 

 The definition of Mesocyphoua will require remodelling, as I have 

 stated in the „Western Diptera", p. 199. I have not seen any european 

 species, belonging in it. The structure of the forceps of the male, 

 which untergoes very considerable modifications among the Eriopterae, 

 in the surest guide towards the discovery of affinities; subdivisions, 

 established without the use of that character, are worthless. 



In the Monogr. Vol. IV, I have given my reasons for abandoning 

 Dr. Schiner's arrangement of the Eriopterina. There is no reason tor 

 separating EJiyphoJoplms from his Da>^yptera; and, being united, the 

 former name must be adopted as the earliest. Tricho>iticliu Schiner 

 is composed of the most heterogeneous elements: T. maculuta is an 



