89 



tlic lliird joint shMulcr .uid iicutp ; they project ;is liir heyond the front ;is in 

 Pftropliora. Fore wings nuicli as in Pelrvplwra, \\\v. eonvexily of I lie cosla 

 the sani(>, and the apex subaeute. The hind wings are of the sarn(! shape as 

 in Pctropltoni. The; venation (Htfers deci(h>dly, the first tiiree subcostal 

 venules Ix'ing nuieli sliorter than in any other genus of the subfamily cxceiit 

 llyd/ioDuna; the oriuius of these venules are e<|uidis1aiit, the origin of the 

 second sulxostal being situated halt-way between the end of the outer snii- 

 costal cell and the origin of the third venule. There are tvfo subcostal cells, 

 the inner one usually much smaller than the outer. The origin t)f (lie first 

 median venule is rather remote from the second, much as in Lohophord. 

 Hind wings as in Petrop/iom. Hind legs with the tarsi as long as the tibia;; 

 the first joint of the tarsus nearly as thick as the tibiae. Coloration like that 

 of Pe.tropliora, but with a narrow median band on the fore wings. 



This genus chicHy differs from Petrophora in the venation, and the fuller 

 front of the head, and the coloration. The venation is much as in Hydriomena, 

 and is so different from Pelrophora as to forbid uniting it with that genus. 



Larva. — "Quite short and slender, a little swollen anteriorly, with very 

 distinct lines; head large, subglobular, liordered with the prothoracic shield; 

 anal points very distinct; living on conifers. Pu])n green ; in cocoons of silk,- 

 among leaves." — (Guende.) 



Thera contractata Packard. Plate 8, fig. "2 8. 



CUana (Thcra) contracia Pack., Fifth Rep. Poab. Acad. Sc, 56, 1871. 



3 <?. — Palpi, head, and thorax, as well as wings, pale cinereous; base 

 of fore wing with scattered black scales, and two angled, parallel, black 

 lines, the outer heavier, and marked with longitudinal stripes on the veinlets; 

 beyond, a Iiroad, pale band, of very uniform width, slightly angled on the 

 median vein; beyond, a mesial band margined with black, narrowing iiion; 

 than usual on the iuiier margin, where it is less than one-third as broad as on 

 the costa, and the two black margins meet, forming two contiguous black 

 patches. In front, the band encloses obscure ringlets of cinereous ; the sides 

 art! niori! broadly dark on the costa; discal dot black; beyond, an obscure, 

 pale patch; margin with a zigzag white line, the acute scallops enclosing 

 dark dofs ; edge of both wings with the usual black dots, and fringe concol- 

 orous with (he rest of the wing, and hind wing uniform pale cinereous, with 



