220 NOTES. 



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

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

 distinct. 



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

 with Ion?, 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 tbat it 

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

 Vi.nna since and have given up all idea of a relationship. 



The type of D. miralilis 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 Diotrepha means fed by tlie Gods. 



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

 quotes Loew in lift., this may be the same as the M. pliryganopterus 

 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, 151152. 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 

 taenionota M., flarescem F., fuscipemris M. (as I saw them named in Mr. 

 Kowarz's collection). Erioptera maadata M. is a true Acypliona, agreeing 

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

 The definition which Dr. Loew gives of Acypliona (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 

 Acyplionae therefore, are not Acyplionac in my sense at all. Moloplulus 

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

 The definition of Mesocypliona 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 for 

 separating Rhypholophus from his Dasyptera; and, being united, the 

 former name must be adopted as the earliest. TricJiosticha Schiner 

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



