PROCEEDINGS, 191S 21 



actcrs in conjunction with each other, it will be easier to separate our 

 Briti.sh Columbia species than has hitherto been the case. Messrs. 

 Barnes and McDunnough are certainly to be conoratulated on their 

 work, which, as far as our present knowledge goes, is pretty nearly 

 perfect. 



I may state here that it is not necessary to break off the body of a 

 cherished specimen to examine the genitalia, as by simply removing a 

 few hairs with a fine brush from the anal segment, the uncus is exposed 

 to view and can be readily examined under a strong lens or low-power 

 microscope. 



There are three distinct types of uncus in this group — truncate, 

 conical and bifurcate — each of which has its own modific'ations and 

 variations. 



I will not take up your time in going over the whole list of British 

 Columbia, species separately, but will give you a few remarks on the new 

 forms, with their distinguishing characteristics, and also on those which 

 may be difficult to determine, contenting myself with giving you a list 

 of those species that are well known and of which the names have not 

 been changed. In their proper sequence, the latter consists of furcata 

 periclata Swett ; nubilofasciata cupidata Swett (Mr. Day, of Duncan, 

 has taken the only specimen in British Columbia, that I have any record 

 of); manzanita Taylor; irata Swett ; californiata Pack : and speciosata 

 Pack, with its forms taylori Swett, and ameliata Swett. The latter of 

 which only two specimens have been taken, both of which were collected 

 by myself. 



There has been considerable doubt in the past about the two species 

 furcata Thun., and quinquefasciata Pack. An examination of the 

 genitalia of the two forms shows quite a difference, and they are easily 

 separable by this character alone. 



The shape of the uncus in furcata (page 25, Fig. 1), is identical with 

 the figure given in Pierce's "Genitalia of the British Geometridae." The 

 colour of the primaries of this species is either smoky or else decidedly 

 reddish. There is also a European form that occurs with it, fuscoun- 

 data Don., which is very strongly marked, and having a greenish tinge 

 with the median space ruddy. It is practically identical in maculation 

 with the next species quinquefasciata Pack., and can only be separated 

 by the shape of the uncus (page 25, Fig. 3) being convex instead of 

 concave, having the base broader and the lateral apical points much 

 reduced. With this species goes the form viridata Pack., which is 

 greener, has no ruddy shades, and is more indistinct in its markings. 

 I have specimens of these forms, all taken in Victoria. 



We are all pretty well acquainted with the species hitherto known 

 as reflata Grt. This name has now been relegated in a varietal sense 



