ORISMOLOGY. 359 



num is at first adnate to the sides of the postscu- 

 tellum, and then diverges across the pannel to the 

 base of the wings. Ex. Belostoma grandis. 



IV. ABDOMEN. 



1. COALITE (Coalitum). When the abdomen is not 



divided into segments. Ex. Araneidea, Chelonus. 



a. PLICATE (Plicatum). When it consists of transverse 



folds. Ex. Gonyleptes, Carldnodes*. PLATE XV. 

 FIG. 11. 



b. TENSE (Tensum). When it is not folded. Ex. 



Most Araneidea. 



2. INSECTED (Sectwri). When it is divided into seg- 



ments. Ex. Most insects. 



3. SESSILE (Sessile). When it has no footstalk, but is 



closely united to the trunk. Ex. Coleoptera. 



4. PETIOLATE (Petiolatum). When the first segment, 



or more, is longer and much narrower than the 

 subsequent ones, so as to form a footstalk. Ex. 

 The Sphecidtf, Ichneumon. 



5. ADJOINED (Adjunctum). When it is connected with 



the trunk by a very short petiole. Ex. Vespa, 

 Apis. 



6. SUPERIMPOSITED (Superimpositum). When the foot- 



stalk of the abdomen is inserted in the upper part 

 of the postscutellum, so as to leave a considerable 

 space between it and the postpectus. Ex. Evania. 

 PLATE IV. FIG. 2. 



7. RETRACTED (Retractwri). When it is nearly with- 



drawn within the trunk. Ex. Gonyleptes. PLATE 

 XV. FIG. 11. 



* VOL. iii. p. 396. 



