USED IN ENTOMOLOGY. 31 



Semicylindric, flat on one side ; the form of the longitudinal 

 half of a cylinder. 



Semisagittate, half arrow-shaped ; like the longitudinal half of 

 an arrow-head. 



Septum, an internal division of a tubular body. 



Sericeous, having the surface shining by means of dense, minute, 

 short, silky hair. See pubescent. 



Serrate, like the teeth of a common saw ; differs from crenate 

 in having the teeth acute, and from dentate in having them 

 directed towards one end, their tips not being opposite to the 

 middle of their base. 



Sesquitertial, occupying the fourth part. 



Sesquiocellus, or sesquialter, a large ocellus including a smaller 

 one. 



Sessile, connected immediately with the part from which it 

 originates, without the intervention of a peduncle ; (abdomen) 

 attached to the stethidium by a considerable part of its whole 

 breadth. 



Seta, a bristle. 



Setaceous, bristle-shaped ; slender and gradually attenuated to 

 the tip. See capillary ^ filiform. 



Setarious, aristate ; terminating in a simple naked bristle, as 

 in the antennae of some of the Diptera. 



Setous, bristly, set with bristles. 



Sexes, of insects, are distinguished in Entomological works by 

 (Mars) for male, and 9 (Venus) female. 



Shank, the tibia. 



Simple, destitute of any remarkable process or appendage ; 

 (thighs) equal, not dilated or formed for leaping ; (aculeus) 

 having only a single dart or point, not vaginate. 



Sinuate, indented : cut into deep sinuses. 



Sinus, a curvilinear indentation more or less profound ; differs 

 from emargina in not being angulated ; an excavation as if 

 scooped out. See refuse. 



Solid, this term is applied to the capitulum of the antennae, 

 when the articulations of which it is composed exhibit no in- 

 terval between them. 



Sparse, or sparsate, scattered ; spread irregularly, and at a dis- 

 tance from each other. 



Spatulate, battledoor-shaped ; round and broad at top and attenu- 

 ated at base. See cuneiform. 



Species, comprehends all the individuals which descend from one 

 another or from a common parentage, and those' which resemble 

 them as much as they resemble each other. 



