306 Mr. G. E. H. Barrett-Hamilton on 



Melolontliides by Lacordaire ; but tliat author cannot, I think, 

 have compared it with Chlorochifon, or he would not have 

 widely separated them. He has described the front coxae of 

 the former as transverse, but a very casual examination shows 

 tliat there is practically no difference in this respect between 

 the two genera. He was also mistaken in the number of 

 joints in the antennae of Chlorochiton and Phytolcema, to both 

 of which he attributed nine joints. As to the latter there 

 has been a curious difference of opinion. Sober stated that 

 there were nine antennal joints in P. mutnhilis. Blanchard 

 counted eight in the same species, as did Redtenbacher in 

 P. elaphocera, while Lacordaire corroborated Sober. After 

 a careful examination of two species of the genus I have 

 concluded that the two last authors mistook a condylar process 

 at the base of the first lamella of the club for an additional 

 joint. 



Of the other genera most nearly related to the foregoing, 

 Colymhomorpha and Pyronota (respectively inhabiting Aus- 

 tralia and New Zealand) are united in the Munich Catalogue 

 (following the rather hesitating opinion of Burmeister). They 

 are entirely distinct, however, differing widely in the antennte, 

 mouth, claws, and the front tibial of the male. 



XLIT. — On Tico new Vohs of the Subgenera Pitymys 

 and Microtus. By G. E. H. Barrett- Hamilton. 



I. Microtus {Pifymy.^t) Thomnsi, sp. n. 



Colour. Above near " mummy-brown " *, the general effect 

 being due to the tips of the hairs, which are thus coloured 

 for a length of about 2 millim. ; the remaining 6 millim. are 

 " slate-black," which colour, showing unevenly through the 

 brown tips, gives the whole a finely grizzled appearance. 

 The colour of the upper surface becomes ligliter and more 

 yellowish on the sides, but passes without any very distinct 

 line of demarcation into the dirty liglit buff of the underside. 

 Feet dirty white. 



The ears are nearly hidden in the fur. The length of the 

 hind foot is about three quarters that of the tail. 



* Names of colours placed in inverted commas are taken from 

 Mr. llobert Eidgwa\'s ' Nomenclature of Colours,' 1886. 



