NORTH AMERICAN LEPIDOPTERA. 205 



The species is readily recognized. It is intermediate between un- 

 dnlosa and catalpce in size, with the same typical maculation, distinct 

 enough from each at first sight by the green or olivaceous j^owdering 

 of the primaries. 



The variation is in the intensity of coloring ; sometimes the pri- 

 maries will be very dark, leaving only the outer margin beyond the 

 transverse lines paler. Prof. Riley has figured the extreme of this 

 variation as well as the more common form and the larva, in the 

 Kept. U. S. Agricultural Department for 1881-82. The genitalia 

 are much as in undidosa. I could not make a very close study of 

 them. 



D. catalpse Bd.,» Sp. Gen. Lep. Het. i. 103, pi. ii, figs. 1 and 2, Siphinx ; Strk., 

 Lep. Rhop. et Het. 142. Sphinx: Grt., Buff. Bull. iii. 224, Diludia ; Koebele,« 

 Bkln. Bull. iv. 20; Grt., Can. Ent. x. 231, Daremma; Butl., Tr. Zool. Soc. 

 Lond. ix. 629, Pseudosphinx ; Riley,* U. S. Agr. Eep. 1881-82, 189, pi. xiii. 

 life history. 



Ashy or fuscous gray, more sordid in appearance than either of its congeners, 

 with essentially the same markings, but much less distinct. Head and sides of 

 tegulffi paler, more grayish, collur with two transverse black lines joined at the 

 extremes. Tegulse darker to the lateral pale shade, a distinct brown line sepa- 

 rating the two shades: the terminal tuftings are blackish, dorsum of thorax of 

 the ground color. Abdomen of the same sordid fuscous gray with a more or less 

 evident dorsal line and a broader, interrupted, subdorsal line and a narrow lat- 

 eral one. Beneath uniform pale fuscous gray. Primaries with an obscure, trans- 

 verse shade at basal fourth, outwardly angulated over the cell, and inwardly 

 terminating on the inner margin rather close to base. Beyond the discal spot is 

 another dusky shade somewhat lunulate, more distinct than the others, evenly 

 curved outwardly over the cell and thence rather straight to inner margin a 

 little beyond the middle. Beyond this line, to the outer of the following lines, 

 the wing is usually somewhat lighter in shade. From the outer fifth of costa a 

 double line runs, outwardly curved to middle, then parallel with outer margin, 

 to the hind margin rather close to the anal angle. The two parts of this double 

 line are rather remote at costa, the outer forming an obscure blotch. An oblique 

 angular black streak from apex inwardly, a longitudinal black streak between 

 veins 5 and 6, and another in the submedian interspace near the base. Discal 

 dot distinct, round, pale, dark ringed. Fringes paler gray, cut with dark brown. 

 Secondaries deep fuscous brown, with three indefinite darker transverse bands, 

 the two median converging at anal angle. Fringes as in primaries. Beneath 

 much the same color as above, but a somewhat paler shade, the transverse 

 shadings of both wings faintly reproduced. Expands 2.75 — 3.50 in. ; 70—87 mm. 



Hab. — Virginia to Florida ; westward to the Mississippi ; as far 

 north as Indiana. 



The species varies somewhat in intensity of markings, but never 

 becomes distinctly ornamented. Boisduval figures a form with much 



