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 (Sectum). 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 Sphecidce, Ichneumon. 
5. Adjoined (Adjunctum). When it is connected with 
the trunk by a very short petiole. — Ex. Vespa, 
Apis. 
6. Superimposited (Snperimpositum). 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. 
V. Retracted (Retractum). When it is nearly with- 
drawn within the trunk. — Ex. Gonyleptcs. Plate 
XV. Fig. 11. 
* Vol. iii. p. 3&6. 
