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TEXT-BOOK OF ENTOMOLOGY 



sternum is divided into four pieces besides the sternum proper 

 (Fig. 96) ; and in Embia, also, the sternites, according to Sharp, are 



complex. 



The apodemes. The thorax is 

 ^ supported within bv beam-like 



FIG. 95. Alitrunk of Sphex chrysis : A, 

 dorsal aspect ; , pronotum ; b, mesonotum ; 



c, tegula ; d, base of fore, e, of hind, wing ; 

 y, ff, divisions of metanotum ; h, median (true 

 first abdominal) segment ; i, its spiracle ; k, 

 second abdominal segment, usually called the 

 petiole or first abdominal segment. B, posterior 

 aspect of the median segment ; a, upper part ; 

 b, superior, c, inferior, abdominal foramen; 



d, ventral plate of median segment ; e, coxa. 

 After Sharp. 



FIG. 96. Sternal view of pro-, meso-, and 

 metathorax of Forficula ht-niata : pat, prsester- 

 num, divided into 4 pieces; st, pro-, st , rneso-, 

 st" , metasternum ; ex, coxa; not, notuin. 



passing up 

 y 



from the sternum 



processes, or apodemes, which pass inward and also form attach- 

 ments for the muscles. Those 

 form the entothorax of Audouin, 

 and the process of each thoracic 

 segment is called respectively 

 the antefurca, medifurca, and 

 post f urea. In the Orthoptera 

 (Caloptenus and Anabrus), the 

 antefurca is large, thin, flattened, 

 directed forward, and bounds 

 each side of the prothoracic 

 ganglion. In the Coleoptera two plates (Fig. 97, 2. s) arise from the 

 inside of the sternum and "form a collar or leave a circular hole 

 between them for the passage of the nervous cord" (Newport). 



FIG. 97. A, under surface of prothorax, or 



pniMrnmm. i>f I>i/t!ciix <//<///////< -.fix : 'l.g, pro- 

 sternuin; 'i.f, epistmium ; 'J./(, rpiiiuTiim; '!.(<, 

 antefurca or entothorax. 



