108 CLARK — SOME UNDESCRIBED SPHINGIDAE [Py 22.0. 
Perigonia lusca bahamensis subsp. nov. 
Plate XII, figure 4. 
Al. ant. long., o’, 29mm.; 9, 31 mm. Al. ant., lat., #, 11.5 mm.; 9, 
12mm. Marg. ext., o',16mm.; 9,17 mm. 
Habitat.— Andros Island, Bahamas. Males and females in coll. B. 
Preston Clark, taken by W. M Mann, July, 1917. 
The Bahaman form of P. lusca is larger than the other West Indian forms 
of this species. The light shading on the fore wing above, of the basal 
area, of the undulate postmedian line, and of the distal marginal area, gray 
in f. interrupta Walker, has, in this form, a bluish tinge. The same is true 
of the patch at the hinder angle of the hind wing above. The yellow area 
at the anal angle of the hind wing above is much more marked than in f, 
interrupta, to which this form is closely allied. The ground tone of both 
the fore wing and the hind wing below, gray in f. interrupta, is distinctly 
rufous in the Bahama individuals. 
While in its general maculation this form is very close to f. interrupta, its 
size, which appears to be uniformly greater in a considerable series, as well 
as the marked differences in color above noted, seem to justify subspecific 
separation. 
Gurelca sonorensis sp. nov. 
Plate XII, figure 5. 
Al. ant. long., o',17 mm. Al. ant. lat., 7,7 mm. Marg. ext., 7, 7mm, 
Habitat. — Copete Mine, thirty miles east of Carbo, Sonora, Mexico, 
One male in coll. B. Preston Clark, collected by Dr. F. C. Nicholas, August, 
1915. 
This is a remarkable form, and marks the first occurrence of the genus 
Gurelca in the Western Hemisphere. Through personal conversation with 
Dr. Nicholas I have verified the locality. 
Palpus projecting, terminal surface triangular, almost quadrangular; 
scales at apex of first segment prolonged laterally, forming a kind of fan; 
brown. In all respects typical of the genus. Antenna (only the left 
present, and that broken) brown, compressed, filiform. Thorax and ab- 
domen above, light brown; dark brown lateral patches on tergites. Ab- 
domen below, yellow-brown, irrorated with dark brown. Minute white 
lateral patches at the base of segments 4 to 6. 
Fore wing above: Light brown with darker markings. Elongate basal 
patch 2 mm. in length. Dark antemedian line extending obscurely from a 
