NORTH AMERICAN J>EPID0PTP:RA. 10') 



rarely furnished with an embossed, or a hjng, sharp, conical tubercle. 

 The vestiture is sometimes smooth, of closely appressed scales, some- 

 times tufted with comparatively long, overhanging scales. 



Eyes. — The eyes are large, globular, prominent, naked. There is 

 often a tendency to lashing, though it is never decided. There is in 

 the eyes scarcely any variation in the family, so far as my observa- 

 tions go. 



Ocelli. — The ocelli, though sometimes wanting, are generally 

 present. In the most of cases distinct, in some instances .scarcely 

 existing. I am of the opinion that in some instances in a species 

 where the ocelli are present, but very small, specimens may be found 

 where they are entirely absent. There seems also a difference in the 

 prominence of this organ in some cases in the sexes. The ocelli are 

 situated back of the ba.se of the antennre and close to the edge of 

 the eye. 



Antennae. — The anteume vary greatly in the species, and in the 

 sexes. They are found in the various s[)ecies pectinate, dentate, 

 crenulate and ciliate, and are generally somewhat uniformly clothed 

 with hairs or tufted. The antennte of the males generally differ 

 from those of the females, the latter being more simple and gener- 

 ally ciliate pubescent. The antennae of the males are in many spe- 

 cies distinguished by a structure peculiar to the family. This con- 

 sists of a moditication (jf the four or five members just beyond the 

 first member above the base. In all cases where this exists thei'e is 

 apjjarently a pressing together of the members on their inner side, 

 thus shortening them, and at the same time somewhat of a length- 

 ening of the same members on the outer side, thus forming a con- 

 cavity or arc in the antennoe. The members of the antenna forming 

 this bend are always more or less fused together, sometimes quite 

 coalescing. x\t the same time, as it would seem by the pressing out 

 and hardening of the juices, the upper extremity of each member 

 in the l)end is prolonged more or less into a chitinous, spine-like, 

 ])rotuberance. The inner portion of the bend also generally has an 

 abnormal development of scales forming a tuft or ridge. Rarely 

 there is another modification in the existence, in the place of the 

 tufting, of a perpendicular filiform process or laminte two or more 

 on each segment. 



The basal member is variable in form, generally l>roadly (jval, 

 sometimes I'ounded, lengthened cylindrical, and sometimes has a pro- 

 tuberance on the inner side, exactly corresponding in this respect 



TRANS. AM. ENT. SOC. XVII. (14) MARCH, 1890. 



