MEMOIES OF THE NATIOiN^AL ACADEMY OF SCIElS^CES. 
119 
Immediately after molting one can see the fluids of the body under the neck; the head is 
‘Cherry-redj while the suranal plate, anal and other abdominal, and also the thoracic legs are pale 
carneous. 
Stage Yf, — Length at first, 20 mm., becoming the next day 23-25 nun. Body as before, but 
the stripes are blackish red, there being no other change of importance. Tlie suranal plate is a 
little larger than before. 
Last stage, — Length, 40 mm. Head large, black, as wide as the body. Ib’othoracie shield 
■dark reddish black. 
The stripes are of the same relative width as in Stage III, but have lost their red color, find 
are brown-black, while the yellow of the body has a greenish tinge. There is no red at all on the 
prothoracic segment or on the legs or on any part of the body. The suranal plate is large and 
black, the black median dorsal line wider on the segment in 
front. The hairs are now Avhitish and thicker than in theprevious 
stages. 
I notice that the hairs on the thoracic segments have at 
times fin individual motion, and are jerked one way and another, 
-as also the warts wliich give rise to them. 
AVhen irritated it discharges a drop of green fluid, its partly 
•digested food. 
One pujiated September 20, and another a little later, 
rupa . — Body long, but not very thick. Head projecting 
in front, with three ridges, one median. Cremaster with four 
long equal acute spines, the points long and tapering, almost 
setiferous; surface rugose. A lateral small, stout spine on each 
side of the base. The vestiges of the 5 sexual opening bi*oad, 
with a round tubercle on each side. Surface of the body 
corrugated with confluent punctures on head and thorax; abdo- 
men coarsely punctured. Length, 22 mm. 
Food plants. — Sumac {Rhns glabra and R. typliina) (Miss 
Morton, Mr. Dyar, Dr. C. Y. Biley). 
Habits, — Lnrvie occurring in July and September; moths in 
•June. July, and September (Riley). 
Geographical distrilnition. — Chicago, 111. (Westcott); Colo 
rado S])rings, Colo., June 25, at light (Gillette); West Farms, 
K. Y. (Angus); Newburg, X. Y. (Miss Morton); New Jersey and 
Pennsylvania (Palm); Chicago, 111. (Bolter); Manhattan, Ivans. (Popenoe); Colorado (Edwards 
Coll. Amer. Mus. Nat. Hist, N. Y.); Illinois (Strecker); Mr. Dyar has received this species from 
(U. S. Nat. Mus.); New York, Pennsylvania, Wisconsin, Missouri, Carbondale, 111. (French). 
Datana robusta Strecker. 
(PI. 11, fig. IfJ, c?;17,9.) 
Daiana I'obKsta Streck., Lep. ind. and Kxot., p. 131. 1872. 
Smith, List Lei), * Amer., p. 30, 1891. 
Kirby, Syn. Cat. Lep. Het.. i, p. 613, 1892. 
Neum. and Dyar, Trans. Amer. Ent. Soc., xxi, p. 199, 1894; Jonrn. Y. Ent. Soc., ii, p. 116, 
1894. 
^foth. — Closely allied to 7>. perspiciia and marked in exactly the same way. Tlie outer margin 
of primaries. seems less distinctly scalloped. Thoracic patch ocher-yellow, shading into tawny 
posteriorly exactly Jis in I). perspicua., or entirely ocher-yellow, with only a few tawny scales 
defining its posterior border. In this latter case it is paler than the thorax. Thorax and primaries 
clay color (It., V, 8, a little paler), heavily dusted with hazel scales (R., lA”, 12), these i)redominating 
in the space between first and fifth lines below the median vein, all throughout giving a dark 
cast to the wing; lines, spots, and fringe, as in D, perspicua^ or rather fainter. Rarely, only the 
•outer lines are discernible. Aledian venules marked Avith brown rather more heavily than in D, 
