Insects Visiting Blossoms of Spirea 129 
One sexual difference in this species is that in the male 
the antenne are strongly serrate and are entirely or nearly 
entirely black while in the female they are quite feebly 
serrate and according to Leng (1890, p. 189) joints 4-11 
are annulate with yellow. As a matter of fact, the antenne 
in both sexes are subject to considerable variation as regards 
color. The following data on the variation in the antennz 
of the males of Leptura canadensis is based on a study of 
fifty-two antenne from thirty-one individuals, some of the 
specimens having lost on antenne: 
Amtennerentirely black... 0.02062 s.cse. ewes 33 from 19 individuals. 
Antenne with joint 8 with more or less yellow 
UMOAAC UE ERs Mie sia staid chacicla els stale ictals:s:s\arntere ste 18 from 11 individuals. 
Antenne with joint 6 with more or less yellow 
PRAMS SM eoy Persncls (ate aie dele sielsladaile ciaheis' sinrareicoilx\ oye 1 from 1 individual. 
Antenne with joints 6 and 8 more or less yel- 
MMP USSE skiers bits css welenwia’s alas ohicisla ate a 1 from 1 individual. 
Except in one case, the two antenne on the same indi- 
vidual were similar. 
The variation in the female antenne is more striking. 
The thirteen females studied agree in having joints 1, 2 and 
3 and 11 entirely black and joints 5, 6 and 8 with more or 
less yellow. The following tabulated data on variation in the 
antenne of the female of Leptura canadensis is based on a 
study of twenty-two antennze from thirteen individuals. 
With joints 4-10 all more or less yellow... 7 from 4 individuals. 
With joint 4 entirely black ...........% 3 from 2 individuals. 
With joint 7 entirely black. /..):3% . 2's. 11 from 7 individuals. 
With joint 9 entirely black: cares silyl 14 from 8 individuals. 
With joint 10 entirely black <.........- 4 from 3 individuals. 
With joints 7, 9 and 10 entirely black...... 3 from 2 individuals. 
With joints 7 and 9 entirely black.......... 10 from 6 individuals. 
With joints 8 entirely or nearly entirely yel- 
LON! Oo obi Ce RRBI Eatid GIRLS Eto. CR GIGI IST ou CORE in Wong 19 from 11 individuals. 
With joints 6 entirely or nearly entirely yel- 
VM is) oP kstel ss a, vate ata rss esynietsi ass ebb ye oI nba a! 14 from 9 individuals. 
With joints 6 and 8 entirely or nearly en- 
GEREEY VOLO W) ooo isc cu-taet, « shoeysieieis\orsle ebsietey4 9) 13 from 9 individuals. 
Tt will be seen from the above that in the specimens from 
the Elka Park region taken in 1915 and 1917 there is a ten- 
dency toward joints 4, 7, 9 and 10 to be entirely black, and 
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