106 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



^^'e add also the following desci'iption, furnished by Doctor Rile}-, who has compared it 

 with the caterpillar of Aiusotii stlgtna: 



" Pellucida comes nearest to A. stir/nid in general appearance, but the spines are shorter, more pointed, uniformly 

 lilaek; the color is darker, being almost Vilai;k, so that the iiapillre, which are rather denser, give the dark portion a 

 bluish cast; the subdorsal and stigmatal lines are of a more intense red, inclining to pink, and the stigniatal line is 

 rather broader than the suljdorsal. The average length is somewhat less and the larva more slender than in stlffina; 

 the shorter, blacker spines, deeper colors, and stronger contrast between the lines at once separating it from stigma." « 



Specimens, without much doul)t belonging to this species, though we have not found the 

 moth in Maine, occurred on the red oak at Brunswick, Me., August 28. The bodj^was greenish, 

 with dark dorsal and lateral, not "reddish." bands. 



Pi/j>ati'o)i. — One larva 25 mm. in length pupated about September 12-14. In casting the 

 larval skin the head split along the middle from the front edge, on the left side of the clypeus up 

 along the median suture, and through the median line of the thoracic segments to a point half 

 through the 3d abdominal segment. 



Variation. — From the batch of eggs received from Albany. N. Y.. about 250 larvse hatched. 

 The entire number did not show any perceptible variation in color or in the length of the horns. 

 They had been placed in a gauze ))ag tied on the end of a small oak tree: but they soon crawled 

 out of the bag and were found huddled up together on the under side of a leaf. 



Mr. Joutel informs me that the larvw of the tirst stage are all similar in color in all he raised, 

 but the other stages vary in the amount of pink in the stripes, some in the third stage showing 

 only a slight trace of it; they also vary in the amount of green. 



Pi(j)a. — S . The body is slightly slenderer than in the S of A. riilicKnda. the spines not 

 quite so stout, while the cremaster is not quite so thick; the surface has similar punctures; other- 

 wise the characteristics of the species are those of the genus. Length, 23 mm. 



Food jiJanta. — Oak of difierent species. 



IlahiU. — This species (^4. virginiensis) has been said by Fitch to have been common for 

 many years in Salem, N. Y.. where ^1. stigma has seldom l)een seen. The larva? mosth' enter 

 the ground to transform into tht^ pupa early in August, though some remain on the trees as late 

 as the middle of September. 



Parasites. — Limneria fugitiva Say attacks the caterpillar when about one-third grown, a 

 single Q^g being deposited in each caterpillar, the larva spinning a slight cocoon within its host. 

 A Tachina oviposits several eggs, usually in the neck of nearly full-grown caterpillars. 



Geograpliieal disti'ihution. — Brunswick, Me. (Packard): Plattsburg, N. Y. (Hudson); Boston, 

 Mass. (Harris): Williamstown, Mass. (Grote); Attleboro. Mass., June IS (Packard); New York 

 (Grote, Elliott): Rhode Island (Clark. Dearden); Columbus, Ohio (Tallant): New Jersey ("com- 

 paratively scarce," Smith): Maryland (Strecker): St. Louis. Mo., and Virginia (Riley): Minne- 

 sota (Lugger); Georgia (Abbot). (See Map IV.) 



Amwla consuhtris Dyar, .Tourn. N. Y. Ent. Soc. IV, p. 166, Dec, 1896. List N. A. Lep., p. 75, 1902. 



Larva. 

 (PI. V, fig. 8.) 



^^ Imago. — Male; smaller than the female: body ocherous brown, wings dark purplish brown, 

 a larger ill-defined subhyaline space in the center of the fore wings; a round white discal dot. 

 Terminal space more purplish than the basal part of the wing. 



"Found on different kinds of oak, October 2, 1873, many larv;e looking like D. stigma. The form is the same, 

 but they differ considerably from them in color and markings. It is to be distinguished from D. stigma iu its smaller 

 size, in the ground color of the dark parts being blacker, the papilL'e being yellow instead of white, and in the ]ialer 

 vittjc lieing of a deep pink or lake-red. The head and anal shield are more olivaceous, and the sj)ines are shorter and 

 stouter. The whole larva is more brightly and distinctly marked. iMoths issued April 22, 1874. 



Some of the dried larva skins were brought from Loudoun County, Va., in July, 1881. (Riley's unjiublished 

 notes. ) 



