Ros 192 



Rostrate. — In the form of a rostrum. (L. rostrum.) 



Rostrulum. — The oral instrument of Aphaniptera 

 (Pulex L.), in which the ordinary trophi are 

 replaced by a bivalve beak, between tlie valves 

 of which there appear to be three lancets. It 

 includes the laminse, scalpella, and lingula. 

 (L. rostrum.) 



Rostrum. — Prolongation of the head between the 

 eyes to a nose or beak. (L. a mouth.) See 

 Proboscis. 



Rostrum. — The upper part of the mouth of 

 Coccidse, from which spring the rostral filaments. 

 (L.) 



Rotative, Rotatory. — (Motion.) When capable of 

 turning wholly round, describing a circle. (L. 

 rota, a wheel.) 



Rotundate. — When the margins pass gradually 

 into each other, and do not meet in sharp angles. 

 (L. rotundus, round.) 



Ruber. — Clear unmixed red. (L. red.) 



Rubescent. — Possessing a rose-coloured pubescence. 

 (From L. ruheo, to be red.) 



Rubineous. — (Splendour.) The red splendour of 

 the ruby. (From L. ruber.) 



Rubrican. — A bay or gray-black colour. (L. ruber, 

 red.) 



Rudimentary. — Undeveloped. (L. rudimentum.) 

 Rufescent. — Somewhat reddish. (L. rufns, red.) 



