228 Mr. A. G. Butler on the 



specimen assumes a hybrid appearance. All the anterior 

 appendages except the eyes are those of Palinurus ; the eyes 

 and the posterior appendages are those of Sc^Uarus, while the 

 intermediate appendages are common to both. It does not be- 

 long to any genus of the Palinuridee ; and it does not belong to 

 any in Scyllarid^ : it either unites the two outlying families 

 into one, or it is the type of a form distinct from either. My 

 own inclination is to bring the three into one family ; but our 

 want of knowledge of the character of the brephalus of Synaxes, 

 whether it be that of Phyllosoma, as are those of the other 

 two forms, in each of which are several very distinct and well- 

 defined genera, makes it more prudent for the present to group 

 it in a distinct subfamily in the same tribe as the other two, 

 thus : — 



Synaxidea. 



Synaxidae. 

 Scyllarina. Synaxina. Palinurina. 



The dried condition of the specimen at my disposal has 

 enabled me only slightly to examine the branchial apparatus ; 

 but from what I liave seen I think it may be tabulated by the 

 same formula as that of Palinurus and Scyllarus. 



The specimen has been kindly lent to me for examination 

 by Dr. Carte, and belongs to the Natural-History Museum 

 under his care in Dublin. It was taken in the West Indies 

 by Commodore Sir F. M'Clintock ; but the depth and precise 

 locality are not recorded. 



EXPLANATION OF PLATE XIV. 



Fig. 1. Synaxes hyhridica. Dorsal aspect. 



Fig. 2. S. hyhridica. Ventral aspect. 



Fig. 3. >S'. hyhridica. Lateral aspect of cephalon (eye removed). 



Fig. 4. q, second pair of pleopoda (Synaxes, female). 



Fig. 5. p, first pair of pleopoda {Arctus, male) ; q, second pair of pleo- 

 poda (Arctus, female) ; r, third pair of pleopoda (Arctus, female). 



Fig. 6. q, second pair of pleopoda {Palinurus^ female) ; r, third pair of 

 pleopoda {Palinwus, female). 



XX. — On the first Part of a Memoir hy Mons. Charles Oher- 

 thilr on the Lepidoptera of the Isle of AsTcold. By Arthur 

 G. Butler, F.L.S., F.Z.S.,&c. 



In the last livraison of his ' Etudes d'Entomologie ' (some 

 preliminary diagnoses for which were kindly forwarded to me 

 by the author Lite in 1880) M. Oberthiir gives an account of 



