MEMOIRS OF THE XATIOXAL ACADEMY OF SCIE>fCES. 



109 



Fig. 54. — Papa of Datana from 

 Olympia, "Wash. Dorsal view of 

 bead. 



.several of tbe same species or variety from Judge P. C. Truman, of Volga. S. Dak., which differs 

 from the same form only in slight respects (i. e.. the yellow spot below the sursiual idate). and 

 which also lives on the oak. 1 will tirst describe tbe Oregon specimens from life. 



Larta. — Length. .35 mm. Head black, roagh, punctured, coarsely so below the vertex: the 

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

 the body as in D. miiiisira: prothoracic shield entirely ocher-yellow mot lemon or sulphur yellow), 

 the yellow extending down each side of the plate and. as in I>. ministra. 

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

 yellow line. Body on each side with five narrow, somewhat wavy, 

 lemon or greenish yellow lines: tbe foru'tb or lateral line wavy or 

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

 represented by sbort jiortions between the thoracic and the abdominal 

 legs. All the lines are narrower than in J>. minMni. Thoracic legs 

 entirely black ocherous around tbe base, but not so much so as in I>. 

 ministra. Middle abdominal legs ocherous. with an external dusky 

 brown, not black, not very large patch just above the planta. Two 



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

 M'bere the abdominal legs would be if present: these patches as in J), minintra, but smaller. Of 

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

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

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

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

 plate, as they do in D. ministra. In this respect the larva is more as in I), angiisii. though in tbe 

 South Dakota specimens two of tbe lines do coalesce and form a small yellowish patch. Tbe 

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

 not white, as in D. anffusii. The hairs are long and abundant, those of the thoracic and three 

 last abdominal segments longer than tbe others; the short dorsal one* form tufts, nearly meeting 

 over the middle of tbe back, and the lateral pairs are groupeil in tufts directed downward. 



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

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

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

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

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



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

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

 specimens) in the narrow lemon rather than sulphur yellow 

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

 tbe suranal plate (though in the South Dakota specimens 

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

 so distinct. Tbe body beuejitb with ocherous patches, bat 

 smaller, less extensive than in I>. ministra. tbe latter, bow- 

 ever, diflering in this respect in different sets of specimens. 

 This may prove to be a climatic variety of D. ministra: 

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

 and in Oregon were tbe apple, as we should hardly expect 

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

 D. californica may be authoctouous. Tbe South Dakota 

 the small vellow bands on the sides of the tenth segment. 



Fig. 55,— Papa of Datan.i frv-m Olympia. Wash. 



s])ecimens are in one respect, i. e.. 



iutermediate between D. ministra and the Oregon examples. 



Tbe foUowiug is a description from life of tbe South Dakota specimens: 



Larra. — Length. 17 mm. Head large, black: protboracic shield ocherous yellow. Body 

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

 width: the longest fifth) are broken and not readily seen: end of tbe lines confluent on tbe 

 tenth abdominal segment, forming a small ocherous spot below tbe suranal jilate. A median 



