the case in 2°, Synchloe Mesentiua, these insects thus resembling in this 

 respect the genus LeptaHs. 



3° and A°. Paiiiassius Apollo and Delias. I possess specimens of both 

 these species in which the first and second subcostal nervures coalesce more 

 or less completely. Sometimes the junction is complete; in other cases 

 the veinlets again separate just before the end of the first subcostal. 



5°. P. Clodias. In the only specimen of this insect which I possess (a 

 female) there is, in the right-hand lower wing, a transverse nerve running 

 from the first subcostal near its extremity towards the second, which, how- 

 ever, is not quite reached, though both nervures are angulated and drawn 

 towards one another by the additional vein. 



6°. Thais Polyxena. In one of my specimens there is a distinct and 

 well-formed prediscoidal cell in the hind wings : in two other cases this cell 

 is faintly indicated. This would seem to be a case of reversion to a former 

 type, and to indicate that Thais is comparatively a modern genus. Its 

 nearest ally is of course Parnassius, but as it also seems to possess a true 

 affinity with Zegris, and so with the Pierinae, we may perhaps conclude 

 that this last-named group is somewhat less ancient than the Papihoninge. 

 Before concluding I may be allowed to remark on the affinity between the 

 genera Parnassius and Eurycus, as shown by the females of each being 

 provided with a horny pouch. I have nowhere seen it stated that this 

 appendage was formed by Eurycus, but the fact is probably well known." 



Mr. Dunning read a " Note on Atropos and Clothilla, with reference to 

 Mr. W. Arnold Lewis's strictures on Dr. Hagen." 



After quoting at length the passage from pp. 54, 65, of Mr. Lewis's 

 * Discussion of the Law of Priority in Entomological Nomenclature, with 

 Strictures on its Modern Application,' in which Dr. Hagen is said to have 

 been guilty of "astonishing chicanery," and to have described in 1805 an 

 insect as having leather-like winglets, ST-jointed antenuce, and with legs not 

 thickened, which in 1861 he had described as having a bare back, ] 5-jointed 

 antennte, and thickened thighs, Mr. Dunning proceeded as follows : — 



"The contention is that the Atropos of 1861 is the Clothilla of J 865. 

 Let us see if this be correct. Linne described a certain insect under the 

 name Termes pulsatorium, and subsequent authors unanimously regarded 

 the Linnean name as designating a creature which for the present purpose 

 may be sufficiently described by saying that it is wingless and has seventeen 

 joints to its antennae. In 1815 Leach founded the genus Atropos ; and for 

 fifty years the insect popularly known as the death-watch was known to 

 entomologists as Atropos pulsatoria. When Dr. Hagen compiled his 

 ' Synopsis of the British Psocidae ' (Eut. Ann. 1861, p. 17), it had not 

 occurred to any one to doubt that this creature was the identical species 

 which Linne described as Termes pulsatorium ; accordingly we find that, 

 at p. 21, Dr. Hagen gives the well-known insect as the pulsatoria of Linne 



