\^ol. Xxii] EXTOMOLOGICAL XEWS. 399 



males, over which I spent an entire day, chiefly examining and 

 most carefully comparing the antennal branches and bristles. 



Four males from New Brighton, Pa., are the largest and 

 brightest colored that I have from anywhere east of the Rock- 

 ies. These have antennal branches about the length of the 

 v.idth of the shaft, narrowly stalked, though, except in one 

 specimen, slightly enlarged at tips, from which spring single 

 bristles about equal in length to the branches. 



Nine from Chicago show a gradation from branches 

 not exceeding width of shaft, with bristles of equal length, 

 the joints being well marked by branches being a little thick- 

 ened at their bases, to others with branches longer than width 

 of shaft, with joints of shaft not marked, and the branches 

 uniform throughout their length, or else a little thickened at 

 tips. In some the branches are as long as, or longer than, some 

 \'ancouver Island pcctinatits, but less thickened at tips and 

 with longer bristle. In others the branches are shorter than 

 in the New Brighton specirnens. Occasionally two bristles 

 spring from the tip of a branch, one a Httle longer than the 

 other, and the bristles are not always as long as the branches. 

 Eight other males from scattered localities in Illinois, from 

 Elmwood, R. I., and Sudbury, Ontario, show similar variation 

 to the Chicago specimens. Such malformations occasionally 

 occur as in other species with pectinate antennse. as two 

 branches being united by a membrane, or one springing from 

 the stem of another. 



Three from Winnipeg have pectinations of three different 

 lengths. In one they are as short as in the New Brighton 

 specimens, and the shortest from Chicago, with bristle as 

 long or nearly as long as branch, and thickened at base rather 

 than at tip. In the other two they are longer but of different 

 lengths, in one as in the longest from Chicago, not thicken- 

 ed at base, with bristle not much more than half the length 

 of branch, and a little, though not much longer than in pec- 

 tiuatus from \'ancouver Island. The last two specimens are 

 typical tertialis, and from type locality. Thirteen males from 

 Husavick and Winnipeg Beach, close together and about 50 



