EUROPEAN AND NORTH AMERICAN SPECIES , 767 



EUROPEAN AND NORTH AMERICAN SPECIES 

 INCLUDED IN THIS VOLUME. 



Not many species have been positively identified as common to tlio two 

 continents, but several are so closely allied that subsequent examination 

 of good series of specimens may prove some of them to be synonyms. 



1 Pachygaster orbitalis WaMbg. From Alclrich's remarks (Cat. N.-Amer. 



Dipt., 192) it seems extremely probable that Loew bad this species before 

 him when describing the female of his F. pidcher from Columbia. 



2 Nemotelus nigrinus Fall. Van der Wulp stated (Tijdschr. Ent., x., 127) that 



he had seen this species from Wisconsin, but Melander considered that he 

 had mistaken JV. wnicolor Loew for it. It is however most probable that 

 N. unicolor and even N. niger Bigot from Chili are synonyms of one very 

 widely spread species. 



3 Sargus cuprarius L. This species is recorded as not rare in Canada and the 



United States. It is a very possible colonist from Europe. 



4 S. nutoeculosus Zett. The record (Johnson, Ent. News, vii., 94) of this species 



from New Jersey must be doubtful until the specific distinctness of 

 Zetterstedt's species is assured. Melander (Canad. Ent., xxxvi., 19) has 

 stated that all North American specimens under this name are only 



5 S. viridis Say. This species is common in North America, and is possibly 



the same as a single male which was stated to have been taken at Cassel, and 

 which was described by Loew in 1855 under the name of S. frontalis ; some 

 mistake may have occurred as Loew's species has not been again recorded 

 from Europe. Mi/iochrysa coerulea Bigot is a synonym of aS'. viridis. 



6 Microchrysa polita L. Apparently common at Quebec and Montreal. In 



all probability another colonist from Europe. 



7 Beris Morrisii Dale. Recorded by van der Wulp (Tijdschr. Ent., xxiv., 153) as 



having occurred at Quebec. 



8 Xylomyia varia Meig. is very closely allied to X. 2Mllij)es Loew. 



9 Xylophagus ater Fabr. According to a female in Bigot's collection (labelled 



" Washington ") X. reflectens Walk, is very closely allied though not quite 

 conspecific, and a supposed male of the same species is still more distinct 

 through the frons being more grey on even the front part and the wings very 

 much more clouded. 



10 X. cinctus DeG. A female in Bigot's collection under the name of X. abdomin- 



alis Loew appears to be this species. 



1 1 Coenomyia ferruginea Latr. Say's C. pallida from the Atlantic States, and 



^icus criicis Fabr. from the West Indies, are now accepted as synonyms of the 

 European species. 



12 Atherix Ibis Fabr. According to Walker the American A. variegata is very 



closely allied. 



13 Haematopota crassiccrnis Wahlbg. The very characters used by Osten 



Sacken to distinguish his //. americana from H. j^luvialis tend to prove that 

 the American species must be almost or quite identical with //. crassicornis. 



14 Tabanus distinguendus Verr. More study is still required to differentiate 



this from T. affinis Kirby, which occurs from Canada northwards. 



