240 Transactions of the Society. 



drawn in, 120 fx ; greatest width of trunk, 50 /x, corona, 35 fx. The 

 head is quadrate, and the width of the deep sulcus between the 

 disks is about one-third that of a disk. The bridge between the 

 disks rises as a rounded lobe, below which is the flatter round of 

 the upper lip. The collar makes a little sharp prominence at 

 each side. The cheeks, collar, and corona are of nearly the same 

 width. The rostrum is short and broad. The two segments of 

 the rump are of nearly equal size, the pre-anal abruptly marked 

 off from the central trunk, and the plicae traverse both. The foot 

 is very short, the first point rapidly tapered and rounded. The 

 spurs are somewhat like those of Callidina microcornis and its 

 relatives, but the membrane joining them is very convex. 



Habitat. — Summit of Papagaio (the Parrot), a mountain near 

 Eio de Janeiro, 1912. 



Okder RHIZOTA. 



The Pthizota of South America are very little known. Daday 

 (7) has recorded five species for Paraguay : — Conochilus vohox, 

 Megalotrocha spinosa, Limnias anmdatus, Meliceria. ring ens, Ge- 

 phalosiphon limnias. I collected other five species in Eio de 

 Janeiro, one of them being hitherto undescribed. 



There were many other species in the various water-lily ponds 

 in the parks of Eio, but knowing almost nothing of the order at 

 that time I could not identify them, and my methods of collecting 

 and preserving have not been very successful with the Ehizota. 

 The five species are all new records for South America. 



The identifications of Floscularia longicaudata and Limnias 

 cornuella were made by Mr. Eousselet from specimens in my 

 collection. There was a Floscularia in Lake Titicaca, which could 

 not be identified. A Floscularia and an Oecistes were found in a 

 stream at Punta Arenas (Chile), but not identified. 



LIST OF SPECIES COLLECTED IN BEAZIL. 



* Floscularia amhigua Huds. * Oecistes pecti^iifer sp. n. 

 F. longicaudata Huds. * Limnias cornuella Eouss. 



* Oecistes crystallinus Ehr. 



Notes on the Species. 



Floscularia longicaudata Hudson. — Mr. Eousselet identified 

 this from a mounted specimen. It had not the long slender 

 foot, but it looked as if that had been broken offl I had seen 

 another example which had the characteristic foot. 



