THE CANADIAN ENTOMOLOGIST 215 



and the abdomen more distinctly speckled. 



Length, 5 mm. 



Type, male, Rutland, \^t., August 1-15, 1916. 



Allotype, Auburndale, Mass., June 22. 



Paratypes, one male, Mt. Greylock, Mass., June 15, 1906; one female, 

 Bar Harbor,' Me., July 30. 1919. 



Type in collection of Boston Society of Natural History. 



I have no doubt whatever that this species occurs in Europe, where it is 

 confused with vespertina, as Stein in one of hi? recent papers on European 

 Anthomyiidae states that vespertina varies in the colour of the halteres, having 

 them sometimes black and sometimes yellow, and in the number of bristles on 

 the anteroventral surface of the hind tibia. I have found only one male of 

 vespertina which had two anteroventral hind tibial bristles and that was on one 

 tibia only. The colour of the halteres in both sexes of vespertina is black while 

 in the new species they are yellow in both sexes. 



BOOK REVIEW. 

 Contributions to the Natural History of the Lepidoptera of North 



America, Vol. IV., No. 4. 

 — The Pterophoridae of North America — by Wm. Barnes, M.D., and A. W. 



Lindsay, Ph.D. 



The final number of \^olume IV. of the well-known "Contributions" con- 

 tains a noteworthy monographic revision of the North American 'plume-moths'. 

 This interesting family has been much neglected by American entomologists dur- 

 ing the past twenty years ; in fact since the publication of the Fernald monograph 

 in 1898 only a few sporadic descriptions of new species have appeared and with 

 each year the difficulties connected with the correct determination of material in 

 this group have become greater and greater. The present paper should obvi^e 

 all this for besides 170 pages of text there are included 7 plates containing most 

 excellent enlarged photographic reproductions of the primaries (and in some 

 cases of the secondaries) of all the North American species, and in addition 7 

 plates dealing with structural details (wing venation and male genitalia). 



Great care has been taken to establish the correct synonymy of each species. 

 A large proportion of the existing type material has been personally examined 

 and in cases where this was not possible, careful comparisons have been made 

 by well-known specialists with material sent from the Barnes Collection. A 

 number of changes in specific synonymy — some of them quite startling — have 

 resulted, but these appear to be thoroughly well authenticated and must be ac- 

 cepted. 



The greatest changes, however, are to be found in the generic nomencla- 

 ture. Following what we believe to be the only course, if stability of nomen- 

 clature is ever to be attained, the authors have adhered strictly to the Interna- 

 tional Rules of Nomenclature and the opinions rendered by the International 

 Commission on Nomenclature. According to these rules a genotype is not fixed 

 until one of the originally included species in the genus in question has been 

 definitely cited — either at the time the genus was created or at a later date — as 



