MEMOIRS OF THE NATIONAL ACADEMY OF SCIEXCES. 191 



l.iisl shii/r. — .Mr. I>yar has (|iiite lully deseribi'd this sta!;'t', Idit Ihi'ie are some structural 

 features to whieli we would call attention. The head i.s distinctly bilcthcd. w ith no warts, Lnt a 

 bristle on each side of tiie vertex. Tlie niarkin.tis of the liead ha\'e been well described by Mr. 

 Dyar. From the lirst abdouiiual segiueut arises a large, double tuliercle, nudoul)tedly movable as 

 iu Schiziira, and serving to frighten away ])arasitic insects. I^'roni tiie hump arise two dark, 

 smooth tubercles, which are directed forward and give rise each to a bristle. 



On tlie eigiith abdominal segment, where the spiracles are nearly twice as large as the otlier.s 

 on the abdomen, is a decided hump, bearing two small, piliferous warts. The anal legs and cud 

 O'f the body are much as in Schizura, being raised at times. 



The larva closely approaches those of the species of Scliizura, lia\ iug essentially the same 

 style of coloration and the same arrangement of terrifying humps and tubercles, but not the 

 l)eculiar V-shaped dorsal nuxrks of Schizura. The markings of the moths are quite different, and 

 while the two genera are ([Uite distinct, they are more closely allied than any other two genera. 



1 add the description drawn up from exam[iles observed in Providence: 



Head not very large, not so wide as the prothoracic segment; pale, almost whitish ash gray; 

 an irregular dark ash band on each side in front iiassiug up from the mandibles and meeting on 

 the vertex, where a branch is sent out at right angles, uniting with its fellow in the median line 

 of the head; no median Hue above the apex of the vertex, but two spurs are sent out above the 

 vertex from each side, which nearly reach the median line of the head, and inclose a clear rouud 

 space. I'rothoracic segment pea green on each side above the spiracle. Mesa- and metathoracic 

 segments bright deep pea-green, bordered with reddish below; a long, narrow, triangular dorsal 

 light-brown l)and, slightly forked on the prothoracic segment, extends from the head to near the 

 base of the large dorsal tubercle on tirst abdominal segment; this tubercle is sensitive and 

 retractile as in the other species of ihis subfamily; it is large but not forked, tlie end being very 

 slightly cleft, blackish iu the middle, and each small terminal wart has a dark hair which is bent 

 downward and forward. First to third abdonnnal segments pale gray and reddish brown, the first 

 less marbled and watered with gray than the second and third; the back of the fourth to ninth 

 segments clear deep pea-green, with a rouud sinus in front on the fourth segment, and on the sixth 

 and front edge of seventh inclosing a watered, gray, elongated, irregular patch. On the eighth 

 segment a small dorsal tubercle tinted with brown; the eighth spiracle much larger and more 

 conspicuous than the others; around the seventh pair of spiracles are clear white patches. The 

 abdonnnal legs 1 to 4 are thick and flesh}', with a reddish brown circular line incomplete above; 

 anal legs small and slender, about one-third as large as the others. Length, 'Ao mm. 



Pupn. — Body short and thick; "minutely but sparsely punctured. At the ])osterior edge of 

 the thorax is a row of granular S(iuare elevations, extending across in a curved line between the 

 wing cases." (Dyar). Tip of abdometi unusually blunt; cremaster partly rudimentary, not 

 projecting beyond the tip, and consisting of two widely separate, flattened, squarish spines, 

 terminating iu two small si)ines. Length, 18 mm. 



Coeoon.— '■'Tough and parchment-like, semitrausparent, similar to that of Schizufd unicornis. 

 After fornung its cocoon, the larva fades to a nearly uniform whitish color, and the change to 

 pupa does not occur till about a month before the emergence of the imago in the spring."' (Dyar.) 



Hahits. — The caterpillar of this moth occurs on the oak at Providence from the middle to the 

 last of September. The larva is very characteristic and allied to those of Schizura. In Professor 

 Riley's collection are the regularly oval, thick, earthen cocoons lined with silk, and about three- 

 fourths of an inch iu length, the caterpillar transforming on the surface or within the earth. 



Eiley records finding larvic in March, and from July to Sei)tember, and the moths as tlying in 

 March, April, May, June, July, and August. 



Food plant. — Different species of oak; on lieech in Sejjtember. IJrunswick, ile. ; New York, 

 white birch (Dyar). 



Geographical distribution. — Brunswick, Me. (Packard); Fraucouia, X. II. (Mrs. Slossou); 

 Cambridge, ^lass., (Hyatt); Providence, I'. I. (Packard); Lansing, Mich, (ililes); Eastern New 

 Y'ork, (Dyar); Plattsburg, X. Y. (Hudson); St. Anthony Park, iNIinn. (Lugger); Georgia, (Edwards); 

 Nebraska (Bruuer); Volga, S. Dak. (Truman, larva- on oak); New York, Pennsylvania, Arkansas 

 (Palm); Maine. New York, Nebraska, Missouri, District of Columbia, Georgia, and Texas (U. S. 



