7358 Insects. 



undoubtedly admit of better arrangement, and ought properly to be 

 broken up into several stirpes of equal value with the other seven. 

 The genus Zygsena cannot possibly, in any natural arrangement, be 

 widely separated from Chalcosia, Procris, &c., either by the cha- 

 racters of the larva or imago ; and these genera, along with Erasmia, 

 Carapylotes, Eterusia, Pintia, Soritia, Herpa, &c., undoubtedly form 

 a natural stirps or family by themselves, distinct fi'om Syntomis, 

 Glaucopis and F^uchromia, the latter of which approaches more 

 nearly to the Chelonidae, with which it is connected by means of 

 some American genera, such as Lophocampa. Atteva Bnicea, which 



is included in this stirps (page 300) be- 

 longs to the Tineina, and probably to 

 the family Yponomeutidae, as the ac- 

 companying sketch of its wing-venation, 

 added to its other characters, will suffi- 

 ciently show. 



Stirps III. is a compound of the Chelonidae, and a group of insects 

 which Mr. Walker, in the British Museum ' Catalogue,' has associated 

 with the Liparidse, but which appears to me to belong to neither of 

 these groups, but to form a separate and independent family, con- 

 necting the Liparidte and Lasiocampidae with the Attacidse, and for 

 which I would suggest the name of Daralidae. They are robust, 

 woolly insects, with broad, substantial wings, densely clothed with 

 scales both above and below, having much the aspect of some of the 

 aberrant Attacidae, which they approach to some extent in the vena- 

 tion of the wings; but they possess. the connecting bristle at the base 

 of the under wings, which prevents their being associated with either 

 the Attacidae or Lasiocampidae, while the character of their trans- 

 formations will equally prevent them from being merged in the 

 Liparidse. There is, however, considerable diversity of structure 

 among the species in Mr. Walker's genera ; and it is quite possible 

 that some of the insects in question, such as Tagora arnaena, which 

 wants the bristle, may truly belong to the Lasiocampidae, to which 

 family their transformations closely approximate. 



R. F, Logan. 



Duddiiigston, Edinburgh, 

 December 4, 1860. 



Rate of Speed of Flight of a Butterfly. — Mi. Home's calculation of butterfly 

 speed (Zool. 7280), astonishing as it is, conveys but an imperfect idea of the actual 



