112 -MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Dataua drezelii Kd wards. 



(PI. n, lig. ,5,^;lig. 0,9.) 



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



Sinith, List Lep. Hor. Amer., p. 30, 1892. 

 Kiiby, Syu. Cat. Lep. Het., i, p. (U3, 1892. 



Neum. and Dyar, Trans. Amer. Eut. 8oc., xxi, p. 198, 1894; Jouin. X. Y. Kut. Soc, ii, p. 116, 

 Sept., 1894. 



Larva. 



(Plate XI, tij;s. 2,2/., 2f, 3.) 

 ICdteanU, Papilio, iv, p. 25, 1884. 

 Jiiiitcnniiillfr, Can. Ent.. xx. p. 57, 188l!. 

 Diinr, Psyche, v, p. 418, 1890. 



Moth. — Extei'ior margin ol' the primaries less distinctly scalloped in tlic i than in the 9 , but 

 fore wings distinctly so in botli, witli the markings as in J), ministra, but larger, and the costal 

 shade is bright, distinct, contrasting. Its tint is ochraceous (Itidg., Y, 7). Thoracic i>atch 

 tawny ochraceous (R , V, 4) in front, shading darker, as in D. ministra. Discal dot large and 

 distinct, darker than tlie line ("Fronts brown," R.. 111,11), the inner round, outer elliptical. 

 Hind wings darker than is usual in ministra, shaded, somewhat jiowdcred with russet (R., Ill, 10), 

 a faint jialer extramesial band sometimes perceptible. Underside essentially like i>. ministrti. 

 Occasionally a dark sha<lc, concolorous with the lines, fills up a part or most of the space between 

 the tiist and tilth line below the costal shade. Exi)anse of wings, IS-.jo mm (Dyar). 



Ef/f/. — Subspherical, shell tliick opake, porcelain white; micropyle smaller than m J>. major. 

 see p. 116. 



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

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

 Body sordid yellow, cervical shield, anal ])late, ;nid feet blackish. A number of short hairs from 

 the head and from al)out si.K rows of simill blackish tubercles, which are larger in proportion than 

 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 si)aces, dull yellow and 

 conlluent posteriorlj'. During this stiige the larva> eat the parenchjina in the same manner as 

 1>. major. I have estimated that a single larva eats about ilO s(]. mm. of witchdiazcl leaf" 



Utafjc II. — " Head black and sliiny, with a few hairs ; widtli, 1.1 mm. Body brown, stripes dull 

 yellow, narrower than the intervening spaces, extending from the cervical shield and the anterior 

 edge of the protlioracu! segment to the anal plate, and becoming a little conlluent there. Cervicid 

 shield, anal plate, thoracic and anal feet, and the abdominal feet outwardly black. Hairs short 

 and i)ale. Duiing this stage tlui larv:e eat the whole leaf." 



Stai/r III. — " Head higher than wide, depressed at the sutures of the clypeus: smooth, .shiny 

 black; widtli, l.S mm. Body brown, the stripes jellow, conlluent posteriorly and along the 

 anterior edges of tlif prothoracic segment. Otherwi.se as in the previous stage." 



Stiii/f I V. — •' Head slniped as before, smooth, centrally dei)rcsseil at the to]) of the clyjieus 

 and more slightly along the central suture; clypeus ;ind labruin wrinkled; all shining black; 

 width, 3.2 mm. Cervical shiehl black or partly brown; in some examples nearly all light brown; 

 anal plate, thoracic feet, and the abdominal feet ontw;irdly black. Body black or jiartly brown, the 

 antei'ior half of the |)rothor;icic segment yellow, the stripes strongly contiuent on the last segment. 

 The bases of the legs and 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 ai)pear conducuit, on iuicount of its darker shade. Hairs sordid white, besides 

 other short, tine, brownish hairs .seen with a lens."' 



Stage F.— " Head as iiigli as wide, llattened in front, dei)rcsscd at the upper pari of the 

 sutures of the clypeus, punctured, ('lypeiis and labruni somewhat wrinkled. Color slimy black, 

 the antenna' and pidpi white ringed, their bases gr(?eiiish. Widtli, o.l mm. I'.ody black, cervical 

 shield honey yellow; anal jilate, thoracic and anal feet, ;iiid the abdominal feet outwardly black. 

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



