Vol. xxi] ENTOMOLOGICAL NEWS 359 



pair of hair pencils fitting into grooves at the sides; the harpes 

 are only slightly asymmetrical, but the claspers are altogether 

 unlike, that of the left side, seen from below, being practically 

 lost, while that of the right side is fully developed. The uncus 

 in this form is only slightly dilated toward tip. In the uniform, 

 or trifolii series, the abdomen has neither hair pencil nor lateral 

 grooves ; the harpes are decidedly dissimilar, both claspers are 

 well developed though entirely unlike, and the uncus is spatu- 

 late at tip. 



Oregonica in genital structure resembles trifolii in that the 

 abdomen has no hair pencils, but the claspers are hugely and 

 irregularly developed, altogether unlike anything else exam- 

 ined. 



Having determined the existence of two structurally distinct 

 forms, I attempted to divide them upon superficial characters, 

 choosing contrast and development of the W-mark in the s. t. 

 line as a base. On this I succeeded in getting two very nice 

 series, coincident in distribution : but on testing by genitalic 

 structure I found it all wrong; some very nicely contrasting 

 forms that should be albifusa by all superficial signs, proved 

 structurally like uniformly marked examples that should be and 

 were trifolii. Abandoning- this base, I noted a slight difference 

 in wing form ; one type with primaries a little more drawn out 

 and pointed than the other. This served better, and then, on 

 close study of individual features, I noted that in some exam- 

 ples the reniform was symmetrical above and below, making 

 a rather broad, kidney-shaped mark. In other examples the 

 inner defining line slopes toward the middle, drawing the mark 

 out into a somewhat conical form that breaks the reniform out- 

 line. I found also that this was accompanied by a somewhat 

 more ovate orbicular, tending to draw to a point inwardly, and 

 on this basis all my examples separated nicely, the genitalic 

 and ornamental characters coming into agreement. 



Unfortunately, I have no European examples for comparison 

 at this time, so that I am unable to say whether our forms are 

 identical with those from that country, or whether there is not 

 more than a single species involved in that country. All that I 



