2-4 THE CANADIAN ENTOMOLOGIST. 



A NEW FORM OF PRIONIA, AND NOTES ON PLATYPTERYX 

 ARCUATA AND P. GENICULA. 



BY GEORGE H. HUDSON, STATE NORMAL SCHOOL, PLATTSBURGH, N. Y. 



Prionia levis, n. var. or sp. 



Primaries without the delicate frosted or silvery appearance, and 

 without the numerous short, fine, strigate, brown lines of bilineata. The 

 brown scales are present, but are uniformly and evenly distributed, save 

 where they form the two brown lines which cross the wing, and a little 

 darker shading near the outer edge and apex. These two transverse lines 

 are about a third wider apart than in bilineata, the second narrowly edged 

 externally with the clear, pale yellow ground-colour of the wing. There 

 is no brown submarginal line, but a wavy, pale yellow line runs from inner 

 margin to costa, midway between the second line and the outer margin. 

 The vestiture appears to be more dense and smooth than in the allied 

 form. Both primaries and secondaries seem to have a more decided 

 ochreous tint. 



Underside with markings more obscured. 



Described from one male taken Aug. 13, 1887, and one female taken 

 Aug. 3. i(Sqo ; both from the electric lights. 



This may prove to be a seasonal form of bilineata. My dates of capture 

 for the latter, since 1S86, are as follows (the figure after the hyphen giving 

 the number of specimens). May 8, 10-2, 15-3, 19; June 16, 22-2, 30. 



Mr. H. G. Dyar, while here last summer, suggested that this new form 

 might be the one which the late Mr. Hy. Edwards (Can. Ent , XIX, 146) 

 referred to P. lacertinaria, Linn. (=lacertula, Den. and Scheiff.). Both 

 P. bilineata and P. levis are distinct from the European form, although 

 very closely allied to it. Mr. Dyar also called my attention to the fact 

 that this form seems to vary somewhat after the manner of Platypteryx 

 genicula from P. arcuata, as pointed out by Dr. Packard in '' Proceedings 

 of the Boston Soc. Nat. Hist.", Vol. XXIV., page 491, 1S90. We 

 separated the two forms and then looked up the dates of capture, with 

 results as follows : — 



Platypteryx arcuata. — May 10-2, n, 16-2, 19,21-2, 24; June 1-2, 



3> 9 5 J ul y -7- 



P. genicula. — July 7, 13, 27-3, 28-2, 31-2; Aug. 2-4, 3-2, 14. 



