MEMOIliS OF THE NATIONAL ACADEMY OF SCIENCES. 121 



divided into two oval lanceolate black plates, the small ends pointing toward the head. Otherwise 

 the body is marked as in the abo\e-desriibed specimen, except that tlieie are black si)ots at the 

 base of the middle abdominal legs. The hairs are not reiireseuted as so clavate as in the other 

 specimen. It is possible that the latter is in the second stage, but if so, the suranal plate would 

 not ])robably bo so large and entire. 



Tliinl stdijc. — Length, 7 mm. (probably not of the normal length, owing to confinement), July 

 30. About ready to molt, as the prothoracic segment is somewhat swollen. The black prothoracic 

 plate still persists, and the hairs arising from it are about twice as long as those elsewhere, but 

 the black suranal plate has disappeared; the anal legs are still slight, and the boily beyond the 

 sixth abdominal segment is upraised. The reddish color has deepened, and the yellowish lines 

 are more distinct, while the spiracular line, inclosing the distinct black spiracles, is pale lilac; the 

 middle abdominal legs do not appear to be spotted. 



Fourth Htaije. — Length, 10 mm., August 13 (evidently underfed and unnaturally small). The 

 head is large, as wide as the body in front; the cervical shield still persists, as do the clavate 

 hairs. The color has now changed to a dark reddish brown, above and beneath, with longitudinal 

 gray strii)es seen from above and four seen sideways; the additional stripe is the infraspiracular 

 one, while the spir-aeular one has moved up, the spiracles being situated between them. 



The following is a description of another larva of this stage received from Mr. Angus, 

 August 25 : 



Length. 15 mm. Head shining black, as wide as the body. 



The body of the visual cylindrical shape, rather slender, dark pitchy reddish brown all over. 

 Prothoracic shield transversely oblong, not so square at the corners as in 1>. pcrspiciia. There are 

 four dull whitish rather obscure lines on each side, which are of nearly the same width and of 

 exactly the sam.e color; they are somewhat irregular on the edges, being somewhat l)roken and 

 of the same distance apart. The lowest or infraspiracular line is a little wider and more distinct 

 than the others, and extends along the lateral ridge. The body beneath is of the same color as 

 above. The suranal plate is black, rounded; the anal legs are black at the tips. The middle 

 abdominal legs are stained black above the plant;?, and the thoracic legs are black. The hairs 

 are long and white; those on first thoracic segment, and eighth and ninth abdominal, longer than 

 those elsewhere; those on the prothoracic segment stand up and curl over the head, and two or 

 three of them are as long as the three thoracic segments put together. The spiracles are black. 



Fifth stage. — Length, 28 mm., August 20. Very different from the fourth stage, the color 

 being .still darker, while only two grayish lines are seen from above, and two lines when the larva 

 is seen from the side. The two dorsal and the supraspiracular lines have disappeared. The body 

 is now clothed with numerous soft fine gray hairs, many of which are nearly as long as the body. 

 The anal legs are still smaller than in the preceding stage. 



Recapitulatioit. — 1. In this species the larvae of the first four stages apparently have clavate 

 glandular hairs, an nunsually late persistence. 



2. The body is reddish in the three first stages, but becomes dark in the fourth, while in I), 

 ministra the body is reddish in the fourth, being less precocious than in this species. 



3. The loss of two of the longitudinal stripes in stage V is noteworthy, and the habits of the 

 larva should be noted by the future observer to learn the probal)le cause of such a change ; also why 

 in D. ministra, and perhaps in other species, there is such a decided change in the general color 

 and stri])es in the last as compared with the penultimate stage. 



4. The black suranal plate seems in Stage I to be entire, and to divide in two at the end of the 

 stage, not being present iu the third stage. It is to be hoped that those who may hereafter rear 

 the species of Dafana will preserve specimens of the earlier stages iu alcohol for future study. 



Haiti ts. — Eggs, August; larviie, August and September; adults, Maj' and August; localities,. 

 Kansas, ^Missouri, Indiana, New York, Elaine, and District of Columbia; food plants, walnut, 

 hickory, larkspur, thorn. (Eiley MS. notes.) 



Food plants. — The larvie prefer black walnut, but feed on hickory, butternut, etc. (Angus); 

 walnut (Pilate); "Live together iu large companies on walnut {Juijlans), hickory {Carya), beech, 

 {Far/ns), and also on oak {(^nercus), but very rarely" (Beutennuiller); willow, honey locust, thorn, 

 and apple (Riley). In Kansas, Juglans nigra (Popenoe). 



