no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 13 



Originally referred by Holland to the Drepanulidse, the genus was placed in the "Saturnidaa" 

 by Karsch. [More recently (1909) G. septiguttata Weym. has been described from East Africa 

 and G. oriens Hampson from Ruwenzori.] 



DYSDiEMONIA Hiibner. 



Dysdsemonia Hubner, Verzeichniss bek. Schmett., p. 151, 1S22. 

 Dysdxmonia Walker, Cat. Lep. Het. Br. Mus., VI, p. 1328, 1855. 

 Dysdxmonia Maassen and Weymer, Beitrage Schmett., I, 1869. 

 Dysdxmonia Felder, Reise der Novara, Lep., IV, 1874. 

 Dysdxmonia Kirby, Syn. Cat. Lep. Het., I, p. 768, 1892. 



Hiibner had only one species under Dysdsemonia, D. boreas (Cramer). 



Imago. — S and 9. Head moderately prominent; eyes rather large. The front is square, 

 though longer than wide, while the squamation is close, the scales appressed to the surface. 

 The male antennae are very peculiar, being long and narrow; the joints are longer than thick; 

 and the distal pectinations are absent; the basal ones very short and broad, obtuse at tip, the 

 outer ones much longer than those on the inside, which are simply short blunt teeth; they 

 are densely ciliated, the long cilia spreading out. above, beneath, and at the ends. The 9 

 antennas filiform, simple, with a minute tuft of cilia on each side of each joint. Palpi very 

 distinct, as the scales on the under side of the head and thorax are short; they extend a little 

 beyond the front and slightly ascend; the tliird joint is not distinct from the second and is quite 

 small. The maxillae are well developed, and, what is unusual in the group, united at their 

 base; and though very slender, coiled up between the palpi, they are about one-third as long 

 as the o" antennae. The thorax is rather stout, and the scales short. 



Fore wings large and broad with the costa straight at base, but well arched toward the 

 apex, which is elongated, squarely docked, and the outer edge deeply excavated and scalloped; 

 in the 9 the broad apex is shorter and the outer edge less deeply excavated than in <? . Hind 

 wings rectangular at apex; the middle of the outer edge is drawn out into a rather long square- 

 tipped tail, which in 9 is much longer though no wider, being nearly as long as half the breadth 

 of the wing. Abdomen of s rather more regularly conical than usual. Costal region wider 

 than in Arsenura. 



Venation: Approximates to that of Arsenura; vein 11^ arises at the same distance within 

 the discal cell; but HI 2 is wanting, showing a reduction and aberration; vein FV \ originating as 

 in Arsenura; vein rV 2 arising in the middle, so that the cells on each side are of the same width; 

 the discal veins each curved, so that the common line made by the two is a distinctly sinuous 

 one. Hind wings with the same general arrangement of veins as hi Arsenura but the anterior 

 discal vein is straight, not curved, and extends very obliquely to origin of vein ni 2 , and the 

 posterior discal vein is not oblique but regularly curved. 



Markings: The genus may be at once recognized by the two twin regularly oval clear spots 

 on the fore wings at the end of the discal cell. On the hind wings is a minute indistinct clear 

 round spot; both wings are crossed by three dark lines which radiate from near the inner angle 

 of the wings. Ground color fawn brown, the color of the elk and deer, also leaf brown. Both 

 sexes have the same shades and style of markings. 



Larva. — Body smooth, unarmed, somewhat as in Agiia tau; the head and first two thoracic 

 segments small; the metathoracic segment large and swollen. 



The genus is marked by the tailed wings in both sexes, but also by the peculiar antennas, 

 which suggest the Sphingid type by their very short pectinations which are ciliated, as do also 

 the coiled, though slender and small maxilla?. In no other genus are there two twin oval spots, 

 one discal, the other in the cell in front. In its colors and tailed wings the moths probably are 

 mimetic and could be mistaken for a dead dry leaf with its stalk. It is allied to Arsenura, the 

 venation not being very different in the two genera. 



In the shape of the head and coloration, the fine close vestiture of the body, and the angu- 

 lated wings and venation, the genus comes near Arsenura, from which, or some allied form, it 

 may have originated; its greater degree of specialization is seen in the short "tails" and the 



