MEMOIRS OE THE :N^ATIONx\.L ACADEMY OF SCIEi^CES. 
191 
Last stage. — ^Ir. Dyai* has quite fully described this stage, but there are some structural 
features to which we would call atteutiou. The head is distinctly bilobed, with no Avarts, but a 
bristle on each side of the vertex. The markings <>f the head have been well described by Mr. 
Dyar, From the first abdominal segment arises a large, double tubercle, undoubtedly movable as 
ill Schizura, and serving to frighten aAvay ])arasitic insects. From the hump arise two dark, 
smooth tubercles, which are directed forward and give rise ea(;h to a bristle. 
Oil tiie eighth abdominal segment, where the siiiracles are nearly twice as large as the others 
on the abdomen, is a decided hump, bearing two small, i>iIiferous Avarts. The anal legs and end 
of the body are much as in Schizura, being raised at times. 
The larva closely approaches those of the siiecies of Hcliizura, haA'ing essentially the same 
style of coloration and the same arrangement of terrifying humiis and tubercles, but not the 
peculiar V-shaped dorsal marks of Schizura. The markings of the moths are quite dilferent, and 
while tke two genera are quite distinct, they are more closely allied than any other tAvo genera. 
1 add the description draAvn up from examples obserAXHl in ProAudence: 
Head not \^ery large, not so Avide as the protlioracic segment; pale, almost Avhitish ash-gray; 
an irregular dark ash band on each side in front passing up from the mandibles and meeting on 
the A^ertex, A\Tiere a brancli is sent out at right angles, uniting with its felloAV in the median line 
of the head; no median line aboAX* the apex of the Axrtex, but two spurs are sent out above the 
Axrtex from eaeh side, which nearly reach the median line of the head, and inclose a clear round 
space. Protlioracic segment pea-green on each side aboAX the sxAiracle. Meso- and metathoracic 
segments bright deep pea-green, bordered with reddish beloAv; along, narroAv, triangular dorsal 
light-brown band, slightly forked on the protlioracic segment, extends from the head to near the 
base of the large dorsal tubercle on first abdominal segment; this tubercle is sensitive and 
retractile as in the other sfAecies of this subfamily; it is large but not forked, tiie end being very 
slightly cleft, blackish in the middle, and each small terminal AA’art has a dark hair Avhich is bent 
doAViiAvard and forward. First to third abdominal segments pale gray and reddish broAvn, thelirst. 
less marbled and watered Avith gray than the second and third; the back oi‘ the fourth to ninth 
segments clear deep pea-green, with around sinus in front on the fourth segment, and on the sixth 
and front edge of seventli inclosing a Avatered, gray, elongated, irregular ]>atch. On the eighth 
segment a small dorsal tubercle tinted Avith brown; tlie eighth spiracle much larger and more 
conspicuous than the others; around the seventh x»air of s]>iracles are clear Avhite patches. The 
abdominal legs 1 to 1 are thick and tleshy, Avitli a reddish brown circular line incomplete above; 
anal legs small and slender, about one-third as large as the others. Length, ^So mm. 
Piq?u.— Body short and thick; “minutely but sj)arsely ]>inictured. At the posterior edge of' 
the thorax is a roAv of grauiilar s<iuare elevations, extending across in a curved line betAAxen the 
wing cases.” '(Dyar). Tip of abdomen unusually blunt; cremaster rudimentary, not 
projecting beyoiijd the tip, and consisting of two Avidely separate, hattened, squarish spines,, 
terminating in two small sj>ines. Length, 18 mm. 
Cocoon. — “Tough and parchment-like, semitransijareiit, similar to that of Svhiznra unicornis. 
After forming its cocoon, the larva fades to a nearly uniform whitish color, and the change to 
I)UX»a does not occur till about a mouth before the emergence of the imago in the si)ring.” (Dyar.) 
Habits . — The caterpillar of this niotli occurs on the onk at Providence from the middle to the 
last of September. The larAm is very characteristic and allied to those of Schizura. In Professor 
Riley’s collection are the regadaiiy o\ml, thick, earthen cocoons lined Avith silk, and about three- 
fourths of an inch in length, the cateiqnllar transforming on the surface or within the earth. 
Riley records finding larvic in March, and from July to September, and the moths as Hying in 
March, Ajuil, May, June, July, and August. 
Food plant. — Different sx)ecies of oak; on beech iu September, Brunswick, 3le. ; Ncaa'^ York, 
white birch (Dyar). 
Oeograpltical distrih^iiion.~Bvm\%\\\i±, Me. (Packard); Franconia, N. 11. (.Mrs. Slosson); 
Cambridge, IMass., (Hyatt); Providence, P. 1. (Packard); Lansing, Mich. (Miles); Eastern New 
York, (Dyar); Plattsburg, N. Y. (Hudson) ; St. Anthony Park, Minn, (Lugger) ; Georgia, (Edwanls); 
Nebraska (Bruner); A olga, S. Dak. (Truman, larAne on oak); New York, Pennsylvania, Arkansas. 
(Palm); Maine, Ncav York, Nebraska, Missouri, District of Columbia^ Georgia, and Texas (U, S, 
