MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



241 



<(wliich shows that iu this as well as in Sohizara aiul perhaps some other genera of NotodoutidiB 



there may be useful specific characters in the front of the heail). Other differences may be seen 



by comparing our camera drawings witli tig. 82. Tiie vestiges of the 9 sexual aperture are oval, 



and shorter than iu H. (jiiitivittu. Behind the .mesoscutum the dark transverse line or band 



usually present is formed of six black tubercles (these in my single specimen may be somewhat 



deformed in this respect and not entirely normal), which are not 



square, but very short and transversely oblong, but otherwise as 



iu IJ. (/utiifitta. Length, 18-19 mm. 



Habits. — The habits and distribution of this species are very 



similar to those of H. guttivitta. In Providence the larva? in the 



second stage occurred July 1, and the fully fed larva occurs as late 



as September 10. 



In Maine I have found larviij 10 mm. in length feeding on the 



rock maple July 21, and the fully developed caterpillars occur there 



late in August and during the early part of September. As in H. 



[juttivitta, the young horned larva shakes its head rapidly from 



side to side when disturbed. The larv;^ when nearly or quite fully 



growu are often observed resting on the midrib on the underside of 



the leaf. When full-fed they leave the tree and wander about before 



pupating. Riley has captured the moth in Maj' and iu August. 



Food x)lants. — The red and sugar maple (Packard) ; " Are cherry, 



yellow birch, white birch, willow, witch hazel, dogwood, beech, hick- 

 ory, etc. (Dyar; see also the food plants iu Dyar's description refer- 

 red to in Ent. Amer."). 



Geographical distribution. — Brunswick, Me. (Packard). In Fran- 



conia, N. H., which appears to be an outlier of the Hudsonian fauna, 



this moth is less common, fewer having been captured at light by Mrs. Slosson than of H. 



giittiritta. which is more frequently collected. 



Massachusetts (Harris Coll.); Plattsburg, N. Y. (Hudson); New Jersey, Pennsylvania (Palm); 



Providence, R. I. (Clark, Packard); New York (Hulst); "Wash- 

 ington, I). C, New York, Illinois, Missouri (Riley, U. S. Nat. 

 Mus.); Kittery, Me., Tiftin, Ohio, Champaign, 111. (French); 

 North Carolina (Morrison); Winter Park, Fla., reddish form 

 (Mrs. Slosson). 



The southern and southwestern limits of this species are 

 not known; it has not been discovered in Texas nor iu the 

 Rocky Mountain region. It is recorded by Druce from Jalapa, 

 Mexico, and Volcan de Atitlan, Guatemala, 2, ."500 to 3,500 

 feet elevation ; San Geronimo, Guatemala, and Pauama, Volcan 

 de Chirique, 2,000 to 3,000 feet elevation. Mr. Druce adds: 

 "The Central American specimens before me agree well with 

 Walker's type in the National collection. The female example 

 from the State of Panama is more distinctly marked with dark 

 brownish spots than any I have seen from North America, but 



Bpecimens from Columbia in my own collection are exactly lilce those from New York;" (P. 234.) 

 It seems strange that so distinct a species as S. ohliqua should be regarded by Mr. Druce as 



synonym of H. biundata. 



The type of "L. olivata"^ is in the Cambridge Museum. 

 S. Mis. 50 IG 



Fig. 83. — Pupa of Heterocampa biun- 

 data. 



Fig. 84. — Pupa of H. biundata; end of body. 



