THE BOMBYCINE MOTHS OF NORTH AMERICA, PART III. 



By Alpheus Spring Packard. 



Superfamily SYSSPHINGINA Packard. 



Family CERATOCAMPID^ (Harris) Packard. 1 



Subfamily 1. Ceratocampin.e Grote. 



(See Part II, Memoirs of the National Academy of Sciences, vol. 9.) 



Subfamily 2. Agliin^e Packard. 



Agliinx Packard, Proc. Amer. Phil. Soc. [XXI (1893), p. 139]. 



Agliinse Packard, Ann. and Mag. Nat. Hist. [(6), XI (1893), pp. 172-175]. 



Head rather large, unusually narrow between the eyes; the vestiture rather long, but not 

 shaggy or radiating. 



Antennae of 6" varying greatly, either bipectinated, with short very densely ciliated branches 

 (Arsenura), or the branches still shorter, forming almost simple teeth, much ciliated (Dysdse- 

 monia), or very widely pectinated to the tip (Aglia and Polythysana), or moderately bipectinated 

 nearly to the tip (Bathyphlebia) . In 9 either with very short pectination (Aglia, Polythysana), 

 or entirely simple (Arsenura and Dysdsemonia). Palpi very constant in form, being unusually 

 well developed, large, compressed, ascending, passing beyond the front, distinctly 3-jointed, 

 reminding one often of the Sphingidae. * Maxilla? unusually well developed, though slender and 

 short; in Dysdsemonia the two appendages are united for about half their length, and they are 

 as long as the head is broad, or about one-third as long as the S antenna?. Thorax rather stout, 

 abdomen conical. Wings often large; fore wings with the costa much curved on the outer 

 half; the apex either somewhat produced and rounded, or broad and square (Dysdsemonia); 

 outer edge normal, moderately full (Aglia) or slightly falcate (Polythysana and Arsenura), or 

 much so, and the outer edge deeply excavated and scalloped in Dysdsemonia. 



Hind wings either normal, with the outer edge either full and rounded (Aglia, Polythysana) ; 

 or with a long angular projection at the end of veins III 2 and III 3 (Arsenura), or in Dysdsemonia, 

 with a rather long tail widening at the square, flaring end, supported by veins III 2 and III 3 . 



Venation: Fore wings, with 11 veins; vein III 2 independent, entirely detached from its 

 original vein or stalk (Arsenura and Dysdsemonia) ; in Aglia and Polythysana the vein is less 

 detached. In all the genera examined the vein IL. arises within the origin of the anterior discal 

 vein, while the origin of this vein, in Aglia, is situated nearer to the discal vein than in any other 

 genus of the group. Another almost diagnostic character of the subfamily is the small size of 

 the discal cell; in all the genera the outer end or side is situated well inside of the middle of the 

 wing; it is widest in Dysdxmonia, narrowest in Arsenura. 



Hind wings with eight veins; the discal cell is small and short, except in Polythysana, 

 where it is two-thirds as long as the entire wing along the median vein (IV), the genus being 

 very aberrant in this respect. 



The common line formed by the two discal veins taken together is very oblique (Arsenura) ; 

 in Aglia much less so. In the venation of the hind wings Aglia is in all important respects 

 much like Arsenura and Dysdsemonia. 



Legs rather large, long, and slender. 



' [According to Art. 5 of the International Rules of Zoological Nomenclature, this family must be called Citheroniida? Dyar, 1894, and the sub- 

 family must be CitheronUnse.] 



83570°— 14 1 1 



