154 AMERICAN ENTOMOLOGY. 



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

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

 rected towards one end, the tips not being opposite to the 

 middle of their base. 

 Sesquiterfial, occupying the fourth part. 

 Sesquiocellus, or sesquialter, a large ocellus including a smaller 



one. 

 Sessile, connected immediately with the part from which it ori- 

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

 attached to the stethidiwn, 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, arisfate ; terminating in a simple naked bristle, as in 



the antennae of some of the Diptera. 

 Setoiis, bristly, set with bristles. 

 Sexes, of insects, are distinguished in Entomological works by 



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

 Shan/i', the tibia. 



Simple, destitute of any remarkable processs 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 I'etuse. 

 Solid, this term is applied to the ca2ntiduni 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. 

 Spatvlate, 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. 

 Specific character, a character which comprehends all the indi- 

 viduals of a species, and distinguishes them from all others of 

 the same e;enus 



