716 Mr. II. Druce on 



of RJunoceros, but at the front end of tlie wing on tlie under 

 side is a large foramen lealing into a wide and deep cavity. 

 Tills space communicates with tlie 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. hicornis this notch is represented 

 by a foramen confluent wMth the upper foramen of the 

 vertebrarterial 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. hicornis 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 complete. They seem to be referable to AcenilJieriuni 

 hugtiense, Pilgrim (loc. 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, 

 nothing 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 Rhinocerotidse and a single large and heavy form to 

 which all these numerous fragments belong. 



EXPLANATION OF PLATE X. 



Fi(/. 1. Pai-acemthermin hugtiense. Ri{,'lit half of ramus. 

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



LXXIX. — Descriptions of some ncio Species of Ileterocera, 

 mostly from Tropical South America. By Hekbkrt 

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



Fam. Syntomidae. 

 llomceocera watkinsi, sp. n. 



Male. — Head and antenna; black ; collar white ; tegulre 

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

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



