168 ZYG^NID^ AND BOMBYCIDtE 



Genus CETA. Grote. 



"The wings are longer than the body. The anterior rather narrow, 

 enveloping the body when folded ; apex obtusely rounded and hind 

 margin slightly oblique. The subcostal nervule gives rise to a mar- 

 ginal nervule, about its middle, and within the disc forms a large 

 secondary cell, from the hind end of which arise three distinct marginal 

 nervules, the lower one reaching the costa rather above the tips. The 

 disc extends rather beyond the apical third of the wing, and the discal 

 vein gives rise to three nervules. The median is three-branched, the 

 posterior branch being remote from the others, and arising opposite 

 the origin of the subcostal branch, which forms the secondary cell. 

 The fold is thickened and the submedian furcate at its base. 



" The hind wings are rather broader than the fore wings ; obliquely 

 rounded along the hind margin from the tip to the base ; costa nearly 

 straight. The costal nervure distinct and simple ; the subcostal simple 

 and rather attenuated from the discal vein towards the base. The dis- 

 cal vein gives rise to two nervules, and sends a false nervule through 

 the disc towards the base of the wing The median subdivides into 

 three equidistant nervules. 



"Head rather small, smooth, free; without ocell. Face rather 

 narrow, tapering, vertical. Eyes small, salient. Antennae slender, 

 with joints closely set, serrated beneath with scales. Palpi slender, 

 cylindrical, curved, ascending rather above the middle of the front ; 

 basal joint squamose ; middle and terminal joints smooth and equal 

 in length. Tongue about one half as long as the body. 



' ' Body slender, scarcely equal in length to the fore wings. Patagia 

 scale-like. Abdomen slender, more than one half as long as the 

 body beneath. Legs smooth and slender ; fore tibi^ with a long con- 

 cealed internal spur ; hind tibia; with a pair of apical spurs. 



"The wing structure of the insect included in this genus resembles 

 most strikingly that of the Tineina, and must form a group connecting 

 the Glaucopidas directly with it." 



Clemens, Proc. Acad. Nat. Sci. Phil, (i860.) 



