Mart). | | CLARK — SOME UNDESCRIBED SPHINGIDAE 107 
1919 
Hind wing above: Basal area orange. Black distal band, 10 mm. in 
width at the costal margin, narrowing gradually to 5 mm. on M2, where it 
narrows abruptly and extends narrowly to the anal angle; obscurely irro- 
rated with white along the distal margin. Faint gray geminate line at 
hinder angle parallel to distal margin, and included in the marginal band. 
Fore wing beneath: Brown-gray, yellow toward inner margin. Sub- 
marginal lunulate dark line extends from a point on the costal margin 
11 mm. from the apex, to a point on the inner margin 5 mm. from the hinder 
angle. This line accentuated by black vein dots. Parallel to it, at a dis- 
tance of 4 mm., extends a faint postmedian lunulate dark line. An obscure 
white patch on costal margin on each side of the submarginal line. Cilia 
prominently white at the veins. 
Hind wing beneath: Similar in color to fore wing. A dark lunulate line 
extends from a point on the costal margin 7 mm. from the apex to a point 
3 mm. from the distal margin at the anal angle. Inside this line extending 
from the anal margin to R2, is an orange area, extending to the base of the 
wing. Second and third discal lines extend obscurely from costal margin 
to the orange area. 
Cautethia yucatana sp. nov. 
Plate XII, figure 3. 
Al ant: long, 9, 16 mm: Al. ant. lat., 9, 7.5 mm. ‘Marg. ext., 9, 
8 mm. 
Habitat. — Izamal, Yucatan. One male and one female in coll. B. Pres- 
ton Clark, taken by George F. Gaumer. 
While I have not examined the genital armature of this form, I have 
no doubt that it is a distinct species. It is closely allied to C. spuria, The 
yellow basal area of the hind wing is as pale as in that form, and the ground 
tone of the fore wing is of the same smoky gray color. In both these re- 
spects it differs from C. grotei and from C. noctuiformis, in each of which the 
basal area of the hind wing is orange and the fore wing above is lighter in 
color. The black marginal band of the hind wing above extends almost to 
the cell. It differs from C. spuria in being a distinctly smaller form. The 
markings of the fore wing above are less prominent. The basal area is 
lighter in color. A dark band extends from the hinder angle of the fore 
wing obliquely basad; it narrows, and then continues obscurely to the 
median point of the costal margin. This band is similar to that in C. noctui- 
formis. In C. spuria this line is replaced by a broader triangular patch, 
with its base at the hinder angle, and its apex on M2, and running less 
obliquely to the inner margin, thus forming a wider angle. 
