hair ; and the characters to be derived from the habits of the 

 species will only be sufficient to divide them into families. 

 Latreille in his various works has comparatively done little in 

 the arrangement of this Order, which appears to have been 

 the favourite of the collector and the outcast of the scientific. 

 Savigny indeed is never to be forgotten for his inimitable dis- 

 sections, so exquisitely delineated in his " Memoires sur les 

 Animaux sans Vertebres," and it is to be res-retted that his 

 labours were limited to the comparison of the analogous organs 

 of some of the Orders. Schrank has instituted many good 

 Genera, as well as Ochsenheimer and Germar ; but the cha- 

 racters of the former are often not satisfactory, and the latter 

 frequently gives nothing more than an example of the genus. 

 With such assistance it is with difficulty that the genus of an 

 insect can be decided. The diurna, crepuscular ia^ and noc- 

 turna are undoubtedly the best understood ; yet it was with 

 great difficulty that I could determine the exact situation of 

 the insect now under consideration. Germar and Leach have 

 separated Rotatoria by the name of Odcfiesis, leaving quo-ci- 

 folia and Pini in the original genus Gastropacha, and the 

 remainder of that genus is distributed between Lasiocampa 

 and Eriogaster. O. Phii, however, differs so materially from 

 G. quercifolia, in its short palpi, straight antennae and entire 

 wings, as well as in the texture of its cocoon, that it will be found 

 to agree infinitely better with O. patatoria^ although it may 

 form a division in that genus. 



Mr. "Wilkes about the middle of September 1748 took a 

 caterpillar of O. Pini upon a white-thorn bush near Richmond 

 Park, which lived through the winter without eating; and 

 my friend Joseph Sparshall, Esq., took a fine male in the Nor- 

 folk and Norwich hospital, 22d July 1809, and I am in- 

 debted to his kindness for being able to give a drawing of it. 

 A British specimen has never before been figured. 



Bemg desirous of making the subject as complete as pos- 

 sible, I have been induced to copy the female caterpillar 

 figured in Roesel's " Der Montalich-herausgegebenen," &c. 

 where he says that it feeds upon Pinns si/lvestris and P. Stro- 

 bus ; that in June it spins a cocoon, and three weeks after 

 the moth appears. The caterpillar of the male, which differs 

 very much from that of the female, is published by Kleemann 

 in his continuation of Roesel's work. 



Pinus stjlvestris (Scotch Fir) is figured hi the plate. 



