246 Journal New York Entomological Society. |Voi. xi. 



Palpi stout, porrect, slightly exceeding the front, and with close scales ; third 

 joint distinct, but short and somewhat depressed. 



Thorax stout, with a few fine slender but long hair-like scales, i. e., flattened 

 hairs, on each side of the patagia. 



Fore wings much as in Automeris, the wings more falcate than in Dirphin ; costa 

 well curved before the apex which is subacute ; outer edge much shorter than the 

 inner and very slightly concave. Hind wings much rounded at the apex ; outer 

 edge full and convex, the inner angle extending as far as the tip of the abdomen. 

 Venation: Differs from that oi Automeris io in vein II (first subcostal) arising 

 nearer the middle of the discal space, while the independent vein arises near the middle 

 of the discal space, i. e., the two discal veins are of nearly the same length, while in 

 A. io the anterior discal is very much shorter than the posterior. In the hind wings 

 the discal cell is narrower than in A. io. 



Colors and markings : Very similar to those of some of the species of Automeris. 

 A curved irregularly scalloped basal line ; extradiscal line strongly rnarked, oblique, 

 a little curved and ending as in Automeris at the apex. Ocellus faint, much as in 

 Automeris. Hind wings with a well-marked very large ocellus of the Automeris type 

 and partly surrounded by a heavy black extradiscal line. 



Abdomen lake-red, but tawny yellowish at tip. 



This genus is based on Dirphia mceonia of Druce, the only spe- 

 cies yet known. 



Geographical Distribution. — So far as yet known the single species 

 of the genus is confined to Mexico, but may be found to extend into 

 Central America. 



This rather remarkable genus is a very interesting annectant form 

 between the two principal subdivisions of the family Hemileucidae 

 represented by Dirphia and Automeris. It differs from Dirphia and 

 Hyperdirphia in the much smaller palpi, which are much as in Auto- 

 Dieris, being of about the same length, though the antennae are of the 

 same shape as in the two former genera. In the shape of the wings 

 it approaches Automeris, and still more in the markings in which it is 

 in advance of its structural features, having the oblique extradiscal line 

 of the fore wings, and the very large and perfect ocellus of the hinder 

 ones. The erect long thoracic hair-like thoracic scales may be an in- 

 heritance from Dirphia, while in the single known species the abdo- 

 men is not striped with dark and yellow, but is reddish carmine. It 

 is most probable that the Automeris group originated from a form sim- 

 ilar to this. Its larval history would be most interesting. 



Eusyssaura, gen. nov. 



Syssaura Huebner (in part), Verzeichniss, p. 150, 1816 (1822?). 

 Oxytenis WALKER, Cat. Lep. Het. Br. Mus., V, p. iiSi, 1855. Kirbv, Syn. 

 Cat. Lep. Het., I, p. 770, 1892. 



