XXI 
and (fig. b) the under side of the nymph of a new species of Oligoneuria, 
for which I have already proposed the specific name " Garumnica."=:' In 
1869, on the very last excursion which I had the opportunity of making in 
the bassin of the Garonne at Toulouse, I had the good luck of detecting the 
singular metamorphoses of this species. In all probability this nymph is 
the first and only one discovered in this genus up to the present time, as 
neither Pictet, the founder of the genus (0. anomala), nor Imhoff (0. Rhe- 
nana), nor Hagen (0. Rhenana, var. pallida), nor my friend Albert Miiller 
in his different observations on the habits of 0. Rhenana, nor M'Lachlan 
(0. Trimeniana), nor lastly, even the Rev. A. E. Eaton, in his fine and 
quite recently published monograph on the Ephemerid8e,f mention anything 
concerning the larval stage (Vetat de ver), or, as it is called in England, 
" the immature condition of the subaqueous stages of development," of any 
of the species, the names of which I have enumerated. I intend to pubUsh 
shortly the complete anatomy of this curious nymph.' " 
With regard to the above notes, Mr. M'Lachlan remarked that it would 
be most desirable to obtain further and more minute particulars respecting 
Dr. Joly's observations. The information furnished was very vague, and 
no characters were given of the supposed new species. 
Mr. Wollaston communicated a paper " On the Genera of the Cossonidse," 
including descriptions of 139 species which had not hitherto been recorded. 
The Secretary read the following remarks, communicated to him in a 
letter from Mr. Roland Trimen, of Cape Town : — 
" I have lately read with much interest the Rev. R. P. Murray's notes 
'On some Variations of Neuration observed in certain Papilionidae,'! and 
desire to offer the following remarks thereon. In cases 1, 2, 3 and 4, 
Mr. Murray does not state whether the anastomosing or coalescing nervures 
are those of the fore or hind wings ; but in the 1st and 2nd, it is clear, from 
the mention of Synchloe (Pieris) Mesentina, Cramer, that the fore wings 
are intended. In this Pieride, however, the junction of the first subcostal 
nervule with the costal nervure of the fore wings is not an aberration but a 
constant character of that species, as well as of P. Severina, Cram., and a 
few alUed species, and (as mentioned by me in Trans. Ent. Soc. 1870, 
p. 378) has been noticed by both WaUengren and Wallace. 
"I am enabled to supplement case 5, ' P. Clodias' (?Parnassius Clodius, 
Me7i.), by a very similar and even more remarkable instance in a male 
Papilio Merope, Cram.., which has just recently come under my notice. As 
in Mr. Murray's description, the subcostal uervules of the hind wing in this 
* Eraile Joly, 1870, " Contributions pour servir a I'Histoire Naturelle des Ephe- 
merines," No. 1, in t. iv. du Bull, de la Soc. d'Hist. Nat. de Toulouse, avec Planche. ] 
+ A. E. Eaton, "A Monograph on the Ephemeridae," in Trans. Ent. Soc. Lond., 
1871, with six plates. 
I Proc. Ent. Soc, 1872, pp. xxxiii. — xxxiv. 
