123 EXPLANATION OF TERMS 



insect or of any articulate is a transverse portion reaching entirely across 

 the body, originally separated on the exterior by incisions or sutures from 

 the preceding and the succeeding segments, having attached to it not more 

 than one pair oi ventral appendages, containing internally not more than one 

 pair of nerve ganglia which supply nerves to the pair of appendages ; = 

 somite, arthromere : fusion of segments frequently obscures, as in the head : 

 externally the walls of one segment may be composed of a number of 

 sclerites separated from each other hy secondary sutures. 



Segmentate: made up of rings or segments. 



Segmentation of egg: the division of the originally single celled egg into a 

 number of coherent cells or blastomeres ; ^ cleavage. 



Segregated: detached or scattered into groups. 



Segregation: a separation or placing apart. 



Sejunctus: separated. 



Sellate: saddle-shaped. 



Sematophore: a seminal packet, composed of the seminal fluid mixed with 

 the excretions of the accessory glands. 



Sembling: = assembling; q. v. 



Semen: the fluid secreted in the testes, containing the spermatozoa. 



Semi-: half. 



Semicircular: like the half of a circle. 



Semi-complete: in metamorphosis, = incomplete ; q. v. 



Semicordate: half or partly heart-shaped. 



Semicoronate: partly surrounded by a margin of spines, hooks or the like. 



Semicoronet: a margin of spines or hooks partly surrounding a structure or 

 process. 



Semi-cylindrical: like a groove or half a cylinder. 



Semi-hyaline: hyaline in part only: not altogether transparent. 



Semi-looper: a caterpillar in which one or two pairs only of the abdominal legs 

 are wanting and where in progression, only small loops are formed : see 

 looper. 



Semi-lunar: in the form of half a crescent. 



Semi-lunar valve: guards the auriculo-ventricular opening of the heart. 



Seminal ducts: = vasa deferentia ; q. v. 



Seminal vesicles: enlarged tube or pouch-like structures which serve to store 

 the seminal fluid of the male, and in which the later stages of its develop- 

 ment may take place. 



Seminiferous: semen-secreting. 



Semipupa: that stage of the larva just preceding pupation: more specifically 

 the interpolated stage between the active larva and the true pupa, in hyper- 

 metamorphosis. 



Semi-saggitate: like the longitudinal half of an arrow head. 



Semitropical or Gulf strip: is the southern part of the Austro-riparian area; 

 extends from Texas to Southern Florida, covers a narrow strip in So. 

 Georgia and probably follows the coastal lowlands into South Carolina. 



Sensim: gradually. 



Sensoria: the circular openings covered by membrane, on the antenna- or legs 

 of plant lice. 



