206 THE CANADIAN ENTOMOLOGIST. 



ing between the more marked ones, constantly occur. Being struck with 

 the considerable differences between the specimens I have collected of 

 diis species, it occurred to me that my observations on the subject might 

 be of interest to some others ; and with that view I give them. In 

 speaking of the spots the following nomenclature will be adopted in this 

 article : — 



I— Anteiior; 2 — intermediate; 3 — posterior; 4 — fourth; 5 — basal; 

 I 6 6 — antero-basal. 



2'' In reference to those of either elytron, tliey may be further desig- 



. > nated as right or left. 



The typical variety (i) is, of course, the one having three of the 

 beautiful creamy dots on the outer margin toward the end of each elytron ; 

 or, the anterior, intermediate, and posterior spots. Where not otherwise 

 stated, all the varieties will be understood to have these three typical spots. 

 Others (2) have the rudiment of a fourth spot, which I have so called, near 

 the inside margin ; being what is in vulgaris the prolongation inward of 

 the anterior spot in sex-guttata. A variety (3) just in advance of this is 

 one having the fourth spot as well developed as the others. I'he one (4) 

 next in order has the anterior spot connected with the fourth by an almost 

 imperceptible thread ; but with no extra markings on the elytra. 



We come now to the forms in which the extra markings, not so fre- 

 quently met with, occur. The first of these forms (5), in addition to the 

 fourth spot, has the rudiment of the antero-basal. The next (6) has, 

 beside the fourth, instead of the rudimentary antero-basal, the rudiment of 

 the basal spot. The other (7) is an amalgamation of the two, having, as 

 well as the fourth spot, the rudiments of not only the basal, but also the 

 antero-basal, thus being really twelve-spotted — twice the number indicated 

 by its name I Then the final (8), and one departing most widely from the 

 typical variety, is distinguished by having the anterior and fourth spots 

 united by a wide line into one, as in vulgaris, forming the irregular, band- 

 like marking, and of nearly the same pattern, with which that species is 

 ornamented.. And further it is distinguished by having also the basal and 

 the antero-basal spots well developed, but not connected; these corre- 

 sponding to the curved band of vulgaris, in the same position. Although 

 the markings are here much more developed than in the preceding, still, 



