of some new Species of Geometridce. Ill 



to the drum of the Cicadce. I regret exceedingly not being able 

 to make out more satisfactorily both this peculiarity, and the struc- 

 ture of certain anal appendages, which seem to exist in both sexes of 

 some at least of the species. In Erateina Zora'ida those of the male 

 consist of two large shell-like valves, lined internally vvith hair, 

 and furnished above vvith a tuft of long hairs on each side ; they 

 appear to be capable of being entirely retracted within the abdo- 

 men. The structure of the scales and hairs, within the fold of the 

 inner margin of the posterior wings, is very remarkable. The 

 scales are oval, much like those of the peculiar spots on the wings 

 of some species of Colias and Callidryas, very faintly striate. The 

 hairs are jointed, composed of striated cylinders, much resembling 

 the spines of an Echinus, easily detached one from the other, and 

 then appearing like small cylindrical scales. On this subject I 

 shall have more to say at a future time, as also on the characters 

 of the abdomen. 



Genus Erateina. 

 Head small, round, the forehead clothed with appressed scales, 

 the vertex between the antennae with a tuft of elongate scales, 

 not closely appressed. Eyes rather small, round, not remarkably 

 prominent. Maxillce about equal in length to the whole body. 

 Labial palpi small, much curved, ascending, parallel, scaly ; the 

 sccLes in front at the base elongate, more or less erect ; behind 

 and towards the apex in front short, appressed ; first joint stout, 

 sub-cylindric, much curved, the apex obliquely truncate ; second 

 joint of about equal length, slendei*er, less curved, sub-cylindric, 

 smaller towards the apex; third joint one-third the length of the 

 second, obovate, and slightly pointed. Antennce not quite so long 

 as the body, simple, the joints short, scaly on the back, thickly 

 set at the sides and within with very delicate, short, erect hairs. 

 Thorax rather small, oval, the prothorax exceedingly short. An- 

 terior rvings trigonate, the apex very slightly rounded, the margins 

 but little rounded, the anterior one-half longer than the inner 

 margin, this latter rather shorter than the outer margin. Costal 

 nervure extending beyond the middle of the anterior margin. 

 Sub-costal nervure throwing off its first nervule before the end of 

 the cell, then bending downwards, and again rising to unite for a 

 short distance with its first nervule, thus forming a small elongate 

 cellule. Second, third and fourth sub-costal nervules united at 

 their origin, the second separating itself at a point nearer to their 

 common origin than the point where the third and fourth separate 

 from each other ; the fourth terminating at the apex ; the fifth, on 



