L. W. Swett.
Geometrid Notes.
Psyche 24(6):190-191, 1917.

This article at Hindawi Publishing: https://doi.org/10.1155/1917/70360
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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 vitalbata 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 oedeagus 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. & S. 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 lmow more about Puche 24:190 I SW). http //psyclir.enl<-liib.ore/24/.24- 190 him1



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