368 THE CANADIAN ENTOMOLOGIST. 



Polyiaxonus,n. gen. — Front wings with the radio-medial cross-vein 

 always present ; the second abscissa of Cu always shorter than the free 

 part of M^; the hind wings with both the free part of R^ and the transverse 

 part of Mg wanting ; the posterior metatarsus never longer than the four 

 following segments together ; the claws appendiculately toothed at base. 

 Type, Taxonus robusttis, Prov. 



Eriocampa, Hartig. — American writers have erroneously referred 

 the species of the genus Cal/roa, Costa, to Eriocampa, and the American 

 species that belong to Eriocampa to Stephens's genus Sciapteryx. So far 

 as I am aware the genus Sciapteryx does not occur in America. 



Sciapteryx punctum, Prov. — This is the female of Dimorphopteryx 

 pinguis, Nort. 



Eriocampa rottmda, Nort. — This is the female of Eriocampa obesa, 

 Say. Say described his species as an Alla?itus, and his name should have 

 precedence. 



MoNSOMA, n. gen. — Front wings with the radio-medial cross-vein 

 always present ; the second abscissa of Cu always shorter than the free 

 part of M4 ; the hind wings with the free part of R4 wanting and the trans- 

 verse part of Mg present ; the posterior metatarsus never longer than the 

 four following segments together ; the head and the thorax smooth, 

 without punctures. Type, Poecilostoma inferentia. 



Poecilostoma albosecta, Prov. — Specimens of this species and 

 Poecilostoma inferentia, Nort., are taken in this region commonly and 

 together on Alder. Although very differently coloured, they are identical 

 in structural characteristics ; there is but little doubt that they are the 

 male and the female of the same species. 



Macremphytijs, n. gen. — Front wings with the radial cross-vein 

 present and the radio-medial cross-vein wanting ; the second abscissa of 

 Cu almost obliterated by the migration of M^-t-Cuj towards the medio- 

 cubital cross-vein; the hind wings with the cell Rn.2 extending to the apex 

 of the wing, with a slight appendage at apex ; the free part of R^ wanting, 

 the transverse part of M2 present ; the posterior metatarsus distinctly longer 

 than the four following segments ; the claws cleft, the rays subequal. 

 Type, Harpiphorus variabilis, Nort. 



This genus is erected to include the American species referred to the 

 genus Harpiphorus. This genus contains a single European species, 

 which is readily differentiated by having the second segment of the 

 antennas longer than the first. The length of the posterior metatarsus in 



