MEMOIUS OF TUE NATIONAL ACADEMY OF SCIENCES. 



109 



Fig. 54.— Pupa of Datana from 

 OlyunHa, "Wash. DorMal view of 

 head. 



.several of the same species or variety from Judge P. ( '. Truman, of Volga, S. Dak., wliicli differs 

 from tlie same form only in slight respects (i. e., the yellow spot below tlie suranal plate), and 

 which also lives ou the oak. I will first describe the Oregon specimeus from life. 



/yrtrfvf.— Length, .l."* mm. Head black, rough, punctured, coarsely so below the vertex; the 

 punctures more or less continent on the sides and in front, with fine lines and ridges. Shape of 

 the body as in D. mhilstra; prothoracic shield entirely ocher-yellow (not lemon or sulphur yellow), 

 the yellow extending down each side of tlie plate and, as in 7>. mhiisfru, 

 crossed longitudinally by a black line, below which is an ocherous 

 yellow line. IJody on each side with live narrow, somewhat wavy, 

 lemon or greenish yellow lines; the fouith or lateral line wavy or 

 scalloped and interrupted at the sutures; the fifth line broken and 

 represented by stiort portions betweeu tbe thoracic and the abdominal 

 legs. All tbe lines are nan'ower than in I), minhtra. Thoracic legs 

 ■entirely black ocherous aronnd the base, but not so much so as in I), 

 ministra. ^liddle abdondnal legs ocherous, with an external dusky 

 brown, not black, not A^ery large patch just above the planta. Two 



ocherous patches behind the thoracic, and behind the fourth pair of abdominal legs in the place 

 wheie the abdominal legs would be if present; these patches as in J), vuiiislra, but smaller. Of 

 the four unbroken lines the three subdorsal ones are continuous; the uppermost or dorsal one is 

 slightly narrower than the third one from the top or middle of tlie back. The ventral median 

 line is broad and continuous, also lemon-yellow, like those above. End of the body black, the 

 yellov/ lines scarcely reaching the tenth segment, and not coalescing under or below the suranal 

 l)late, as they do in I>. ministra. In this respect the larva is more as in D. angimi, though in the 

 South Dakota specimens two of the lines do coalesce and form a small yellowish patch. The 

 body is hairy, much as iu D. ministra in color, being pale gray or testaceous, i. e., pale tawny and 

 not white, as in J), anijusii. The hairs are long and abundant, those of the thoracic and three 

 last abdominal segments longer than the others; the short dorsal ones form tufts, nearly meeting- 

 over the middle of the back, and the lateral pairs are grouped in tufts directed' downward. 



I at first referred tiie larva to D. angusii on account of the narrow lemon-yellow lines, but it 

 differs from that species in having one more lateral line, the ventrolateral one (though in a 

 blown specimen of I), angusii given me by the late Mr. Elliot, this line is represented by a faint 

 yellow mark on each segment); it also differs in the iirotlioracic plate being always ocher-yellow; 

 also the thoracic segments between the legs are not "purplish black," but ocherous yellow. 



It differs from I>. ministra, to which it is nearest allied 

 (and in this respect I agree with Dr. Dyar, to whom I sent 

 sijecimens) in the narrow lemon rather than sulphur yellow 

 lines, in these lines not being confluent on each side below 

 the snranal plate (though in the South Dakota specimens 

 slightly so), and in the ventrolateral or fifth line not being 

 so distinct. The body beneath with ocherous patches, but 

 smallei-, less extensive than in J), ministra, the latter, how- 

 ever, differing m this respect in different sets of specimeus. 

 This may prove to be a climatic variety of I), ministra; 

 I .should certainly think so if its food plant in South Dakota 

 and iu Oregon were the apple, as we should hardly expect 

 to find any species of the genus on the Pacific Coast, though 

 D. californica may be authoctonous. The South Dakota 

 ^specimens are in one respect, i. e., the small yellow bands on the sides of the tenth segment, 

 intermediate betweeu D. ministra and the Oregon examijles. 



The following is a description from life of the South Dakota specimeus: 



Larra. — Length, 17 mm. Head large, black; prothoracic shield ocherous yellow. Body 

 black, with five narrow lemon or greenish yellow stripes on each side, all of nearly uniform 

 width; the longest (fifth) are broken and not readily seen; end of the lines continent on the 

 tenth abdominal segment, forming a small ocherous spot below the suranal plate. A mediau 



Fig. j5.— Pupa of Datana from Olympia. Wash. 



