EXPLANATIONS OF TERMS USED IN TEXT. 283 



R. 



radial vein, (Fig. page 155). 



rectum, posterior part of alimentary canal (Fig. 40). 



reticulate, with net-like veins or markings. 



retrorse, pointing backward. 



roseate, rosaceous, rose-red; a pale blood-red. 



rudimentary, not sufficiently developed to be of use. 



rufous, rufescent, reddish. 



rugose, rugosity, rugx, wrinkled ; wrinkles. 



salivary, relating to saliva ; secreting or convej'ing saliva. 



saltatorial, fitted for leaping. 



scabrous, covered with small, slight elevations; rough like a file. 



scraper, a part of the stridulating organ (Figs. 46, 48). 



scrobes, pits or depressions in -which are placed the bases of the antenna. 



scutel uw, the third division of a thoracic tergite (Figs. 28, 32). 



scutum, the second division of a thoracic tergite (Figs. 28, 32). 



sebiHc, fat-secreting. 



segment, ring-like division or joint. 



semi, a prefix meaning half 



serrate, saw-toothed. 



serrations, teeth like a saw. 



serrulate, finely serrate ; having minute serrations. 



setaceous, bristle-shaped. 



shrilling organs, (Fig. 48) . 



sinuate, indented; cut into a series of deep sinuses with a wavy border. 



sinus, a curvilinear indentation, more or less profound ; an excavation as 

 if scooped out. 



solitary, single. 



spatulate, paddle-shaped. 



speculum, a mirror-like, transparent, shining surface on the tegmina of 

 male grasshoppers and crickets used as a sounding board (Fig. 45). 



spermatheca, a receptacle for semen; the seminal receptacle in the female 

 insect. 



spinose, armed with spines. 



spinulose, furnished with spinules or diminutive spines. 



spiracle, an external opening of the respiratory- sj'stem. 



spurs, the strong spine at the apex of the tibise. 



squamseform, shaped like a scale. 



sternal plate, the ventral plate of a bod3- segment. 



sternum, the ventral part of a body segment. 



stipes, the second joint of the maxilla (Fig. 27). 



stridulate, to make a shrill sound; to grate, scrape or creak with the strid- 

 ulating organs. 



style, a small non-articulated process near base of abdomen. 



