256 THE CANADIAN ENTOMOLOGIST. 



Expanse 12 ram. 



From Coy Glen, Ithaca, N. Y., July, and Black Mt., north 

 fork Swannanoa River, N. Car., May. 



Plectrocnemia canadensis Bks. (Fig. 37). 



My Polycentropus canadensis must be referred to Plectrocnemia, 

 unless a new genus is made for these small forms. The female has 

 the mid legs with dilated tibia and tarsi, but fork 1 is present in 

 both wings, and discal cell closed in both wings. In fore wings 

 fork 1 is as long as its pedicel, fork 2 back to discal cell, fork 3 

 with short pedicel, fork 4 back as far as fork 2. In hind wings 

 fork 1 is about as long as pedicel, fork 2 reaches to cell. The male 

 genitalia are figured. It occurs in many places in Eastern States. 



Plectrocnemia cinereus Hagen. (Figs. 25, 26). 



This is a larger species than P. canadensis, but the male 

 genitalia, which are figured, are similar. 



Plectrocnemia adironica n. sp. (Fig. 60). 



Palpi brownish; antenna? pale, broadly annulate with brown; 

 vertex with gray hair in middle, black hair on sides; whitish hair 

 on thorax; abdomen black above, yellowish beneath, legs pale 

 yellowish. Wings gray, with blackish marks along costa and 

 cubitus; blackish spots at end of veins, yellowish between them, 

 rest of wing with pale brown areas, mostly with yellowish hair; 

 hind wings pale, darker at tip. In fore wings no fork 1, fork 2 

 reaches a little way on discal; fork 3 with short pedicel, fork 4 

 hardly longer, not as far back as fork 2, fork 5 broad near base; 

 in hind wings fork 1 is nearly as long as its pedicel, fork 2 back on 

 cell, fork 5 very broad; the male genitalia have a rather long median 

 ventral plate. 



Expanse 20 mm. 



From Axton, Adirondack Mts.,N.Y., 12-22 June (MacGillivray). 

 The absence of fork 1 in the fore wings makes its generic position 

 rather doubtful; if the loss is accidental, it is a Plectrocnemia. 



Phylocentropus vestitus Hagen. (Fig. 35). 



I cannot see any difference in the male genitalia between the 

 large spring specimens and the small autumn specimens, both of 



