716 Mr. H. Drace on 



of Rhinoceros^ but at the front end of the wing on tlie under 

 side is a large foramen lea ling into a wide and deep cavity. 

 This space communicates with the exterior by a large foramen 

 on the hinder part of the upper border of the wing. The 

 vessel occupying this cavity ran over a deep notch in the 

 front of the wing. In R. bicornis this notch is represented 

 by a foramen confluent with the upper foramen of the 

 vertebravterial canal, while the hinder foramen is represented 

 by a small foramen on one wing and a very small and almost 

 obsolete one on the other. The object of the large cavity so 

 slightly represented in R. bicornis was probably to secure 

 lightness in an unusually heavy bone. 



Another large cervical vertebra was found equalling the 

 atlas in size ; also a large astragalus of Perissodactyl type 

 and several other foot-bones. These will be described later 

 on, when it is hoped further material will be forthcoming. 



Two fragmentary skulls from the same locality may be 

 noticed here, one of them with the series of premolars and 

 molars comi)lete. They seem to be referable to Aceratlierium 

 hugtiense, Pilgrim (luc. cit.). Seeing, however, that frag- 

 ments of skulls and upper teeth of this form are fairly 

 common, while, except for the lower jaw just described, 

 )iothing of corresponding size has so far been found, it seems 

 possible that they are the upper and lower parts of the skull 

 of one species. Of the many foot-bones collected there is a 

 large gap in size between those of various species of ordinary 

 sized llhinocerotidae and a single large and heavy form to 

 which all these numerous fragments belong. 



EXPLANATION OF PLATE X. 



Fig. 1. Paraceratherium hugtiense. Right half of ramus. 

 Fig. 2. Ditto. Upper surface of front portion of ramus. 



LXXIX. — Descriptions of some new Species of IJeterocera, 

 mostly from Tropical South America. By HERBERT 

 Druce,' F.L.S. &c. 



Fam. Syntomidae. 

 Homceocera watkinsi, sp. n. 



Male. — Head and antennae black ; collar white ; tegulje 

 and thorax black, the base of the thorax white ; abdomen 

 metallic green, four yellowish-white spots on both sides of 



