112 MEMOIRS OF THE NATIONAL ACADEMY OF SCIEXCES. 



Datana drexelii Edwards. 



(PI. II,fig. 5,^;fig. 0,9.) 



Datana drexelii H. Edw., Papilio, iv, p. 25, Feb., 1884. 



.Smith, List Lep. Bor. Amer., p. 30, 1892. 

 Kirby, Syii. Cat. Lep. Het., i. p. 613, 1892. 



Neum. and Dyar, Trans. Amer. Ent. Soc, xxi, p. 198, 1894 : Journ. X. Y. Eut. Sec, li, p. 116, 

 Sept., 1894. 



Larva. 



(Plate XI, figs. 2,26, 2r, 3.) 

 Edward?, Papilio, iv, p. 25, 1884. 

 lieutenmiiller, Can. Ent., xx, p. 57, 1886. 

 Dijar, Psyche, v, p. 418, 1890. 



Moth. — Exterior margin of the primaries less distinctly scalloped in the S than in the 9 , but 

 fore wings distinctly so in both, with the markings as iu D. minhtru, but larger, aud the costal 

 shade is bright, distinct, contrastiug. Its tint is ochraceou.s (liidg., V, 7). Thoracic patch 

 tawny ochraceous (R,V, 4) iu front, shading darker, as in Z>. miniatni. Discal dot large and 

 distinct, darker than the line ("Fronts bnjwn," R., Ill, 11), the inner round, outer elliptical. 

 Hind wings darker than is usual in minlstra, shaded, somewhat powdered with ru.sset (R., Ill, 10), 

 a faiut paler extramcsial band sometimes perceptible. Underside essentially like 7). minisin'. 

 Occasionally a dark shade, concolorous with the lines, tills up a part or most of the space between 

 the first and fifth line below the costal shade. Expanse of wings, 48-55 mm (Dyar). 



J^fjg. — Subspherical, shell thick opake, porcelaiu white: micropyle smaller than in I>. major. 

 see p. IIG. 



Larva, Stage I. — "Head rounded, black, shiny; width, 0.5 mm. When nearly hatched the 

 larva is scarcely distinguishable from D. major. The anal feet are rather long and elevated. 

 Body sordid yellow, cervical shield, anal plate, and feet bluckish. A number of short hairs from 

 the head aud from about six rows of small bhu-kish tubercles, which are larger in proportion th;in 

 in the subsequent stages. As the stage advances the body becomes reddish, with four lateral 

 stripes on each side and three ventral, about as wide as the intervening spaces, dull yellow aiul 

 confluent posteriorly. During this stage the larv;e eat the parenchyma iu the same manner as 

 D. major. I have estimated that a single larva eats about UO s((. mm. of witch-hazel leaf" 



St<((/e II. — " Head black and sliiny, with a few hairs; width, 1.1 mm. Cody brown, stripes dull 

 yellow, narrower than the intervening spaces, extending from the cervicq,! shield aud the anterior 

 edge of the prothoracic segment to the anal plate, aud becoming a little confluent there. Cervical 

 shield, anal plate, thoracic aud anal feet, ami the abdonunal feet outwardly black. Hairs short 

 aud pale. Duiing this stage the larv;¥ eat the whole leaf." 



Statje III. — " Head higher than wide, depressed at the sutures of the clypeus; smooth, shiny 

 black; width, 1.8 mm. Body brown, the stripes yellow, confluent posteriorly aud along the 

 anterior edges of the prothoracic segment. Otherwise as in the previous stage." 



Stage IV. — "Head shaped as before, smooth, centrally depressed at the top of the clypeus 

 and more slightly along the central suture; clypeus ,iud labruni wrinkled; all shining black; 

 width, 3.2 mm. Cervical shield black or partly brown; in some examples nearlj' all light brown; 

 aual plate, thoracic feet, and the abdominal feet outwardly black. Body black or i)artly brown, the 

 anterior half of the prothoracic segment yellow, the stripes strongly confluent on the last segment. 

 The bases of the legs aud corresponding spots on the legless segments, as in the mature larva, of 

 a darker yellow than the lines. Each segment is shaded centrally with this yellow, but it does 

 not cause the lines to appear confluent, on account of its darker .shade. Hairs sordul wliite, besides 

 other short, flue, brownish hairs seen with a lens." 



Stage F.— " Head as high as wide, flattened in front, depressed at the upper part of the 

 sutures of the clypeus, punctured. Clypeus aud labrum somewhat wrinkled. Color shiny black, 

 the antenme aud palpi white ringed, their bases greenish. Width, 5.4 mm. Body black, cervical 

 shield honey yellow; anal ])late, thoracic and anal feet, and the abdominal feet outwardly black. 

 Anterior half of the prothoracic segment yellow; stripes narrower than the spaces, citron-yellow, 



