118 EXPLANATION OF TERMS 



Rostellum: a small beak; applied to the mouth parts of sucking lice: also 



used in Hemiptcra, as = rostrum ; q. v. 



Rostral: pertaining or attached to a rostrum; specifically of Hcmiptera. 

 Rostrate: the head, when it has a long protraction bearing the mouth parts. 

 Rostriform: produced like a beak or snout. 

 Rostrum: a snout-like prolongation of the head: in Colcoptera, applied to 



the rigid extension in the snout beetles: in Hemiptera, is the jointed beak 



covering the piercing lancets ; and this is the better use of the term. 

 Rotate: wheel-shaped. 



Rotator: used for turning; applied to muscles. 

 Rotatory: an articulation that permits a rotating motion, e. g., a ball and 



socket joint. 

 Rotula: a small round segment sometimes present between the joints of 



antennae and palpi : = torquillus. 

 Rotule: the trochantine. 

 Rotundate: rounded: in the form of a circle or segment of a circle: without 



angles : said of margins when they pass gradually into each other and do 



not form an angle at their point of junction. 



Royal jelly: the food supplied to bee larvae that develop into queens. 

 Royal pairs or Royalties: the sexually active males and females of social 



insects. 



Ruber: red, approaching carmine [alizar crimson]. 

 Rubescent: reddish or becoming red. 

 Rubiginose: a rusty red [dragon's blood, but brighter]. 

 Rubinous: ruby red: like the eye of a house fly. 



Rudiment -ary: the beginning of any structure or part before it has developed. 

 Rufescent: reddish. 



Rufous: brick-red [chrome yellow + dragon's blood]. 

 Ruga, Rugulae: a wrinkle; small wrinkles. 

 Rugose -ous: wrinkled; with irregular waved elevated lines. 

 Rugulose -ous: minutely wrinkled. 

 Runcinate : notched : cut into several transverse acute segments which point 



backward. 



Ruptor ovi: = egg burster; q. v. 

 Rutilous: a shining bronze red. 



Sabulose: sandy or gritty. 



Sac: in Cocclda;, the separate cottony envelope secreted by many species. 



Saccate: gibbous or inflated toward one end. 



Saccule: a little sac or pouch. 



Saccus: a lobe of ventral plate of 9th segment in ? Lcpidoptcra. 



Saddle: the chitinous plate on the anal siphon of Culicid larvae. 



Sagitta: arrow-like spots on the wings of Lepidoptera and other insects. 



Sagittae: the inner pair of forceps in male genitalia of aculeate Hymenop- 



tera: see stipites. 

 Sagittal: equivalent to longitudinal. 



