190 Psyche [December 
GEOMETRID NOTES. 
By L. W. Swett, 
Boston, Mass. 
I am convinced, after a careful study of the genitalia, that the 
American form of Eucymatoge, now listed as Horisme vitalbata, 
D. &S., is distinct from the European. I have received a number 
of specimens, of the American form of vwitalbata through Mr. 
Wolley Dod from Calgary, Alberta, and of the European through 
Dr. Bastelberger and I can find only very slight external differ- 
ences. The American form of vitalbata seems to have the yellow 
band of primaries, more of a grayish cast, where the European 
is a deep yellow. Also the band of the primaries seems narrower 
than the European and at the apex is more clouded. It is very 
hard to draw any definite characters for separating them except 
on the genitalia which prove most distinct and so would list the 
American form as a race, if not later may turn out to be a good 
species. 
Horisme vitalbata D. & S. var. incana nov. 
The valve are narrower and longer than the European vitalbata 
and the sacculus is most distinct, being bifurcate at tip. It re- 
sembles slightly the shape of a boy’s mitten, with the thumb 
projecting at an angle. In the European vitalbata this process is 
rounded with but a single jointed projection. Also the penis of 
the American form is thicker than the European and the cedeagus 
is spined in the middle, which is lacking in vitalbata. The tip of 
the penis is bulbous with short spines apparently knobbed at the 
base, and the vesica has wide and long cornuti. The saccus is 
broad and rounded. The ductus bursa of the female genitalia 
has three elongated patches from which long stout spines protrude. 
At the junction of the neck or ductus bursa and the bag or bursa 
there is a row of very stout spines projecting at all angles. The 
bursa is instrate or covered with fine spines not heavy and thick 
as in vitalbata. The edge of the bursa in vitalbata is surrounded with 
heavy spines, where in incana they are not any thicker than in the 
other sections. The true vitalbata D. & 5S. may possibly occur 
in North America as our material at present is so limited, so I 
have listed the American form as a race until we know more about 
