l893-] ENTOMOLOGICAL NEWS. 4I 



from the cross-vein, and occasionally we note a very distinctive 

 tendency toward a division of the cell itself, by a distinct fold. 

 The head structure is not unlike that of the Saturniidae, and the 

 same may be said of the leg structure; the armature of the tarsi 

 being usually sparse. On the fore tibiae of some of the species 

 the epiphyses are enormously developed, and force the question 

 of their purpose quite prominently upon the student. In the 

 method of pupation the species of this family differ entirely from 

 the Saturniidae in that they all form naked, subterranean pupae. 



Under the term " Bombycidae," my list contains a miscellane- 

 ous aggregation of forms which did not fit into the families that 

 I had more definitely limited, and, as it stands, this "family" is 

 incapable of definition. It is, however, quite easy to divide it, 

 and we get first, the family Hemileucidae, containing the genera 

 Pseudohazis and Hemiletica as they stand in the list. In vena- 

 tion this family corresponds very closely with the family Satur- 

 niidae, and stands much nearer to it, indeed, than the Ceratocam- 

 pidae; not only in this respect, but in the wing form and in the 

 method of pupation. The family differs primarily in the struc- 

 ture of the antennae, in which there is only a single pectination 

 to each side of each joint. As the number of pectinations is as 

 great or greater than in Saturniidae, it necessitates at least double 

 the number of joints in an antennae of the same length, and these 

 joints are quite different in form. We have thus an absolute, 

 sharply-limited character in the relative number of joints in an- 

 tennae of the same length. The head structure also is quite 

 different, influencing the location of the antennae. In the Sa- 

 turniidae the eyes are comparatively large and extend to the ver- 

 tex, the antennal cavities touch the margin of the eye, and are 

 separated by less than their own diameter, even in the female. 

 In the Hemileucidae, on the contrary, the eyes are much smaller, 

 much more widely separated and do not reach the vertex. The 

 antennal cavities are situated on a prominence, do not touch the 

 margin of the eye, and are separated by nearly twice their diam- 

 eter. So different, indeed, is the head structure, that if we at- 

 tribute as much value to its modifications as Dr. Packard has 

 been inclined to do, we cannot find more widely distinct families. 

 The legs are short and hairy, the spurs obsolete, except on the 

 * posterior tibiae, but the tarsal spinulation is distinct, and the tarsal 

 claws are unusually long. The fore tibiae are peculiar; they are 



