ORISMOLOGY. 313 



to a particular section in any genus or tribe. As, the 

 impressed lateral puncta on the thorax of Scarabtzida ; 

 the lateral furrows and dorsal channel in the ground 

 beetles (Eutrcchma\ and the spots in the primary wings 

 of Xylina Polyodon and affinities a . 



SYMBOLS. 



Male (J. Female $ . Neuter ? . Egg 0. Larva. Pupa-D . 

 Imago 0. Head A. Trunk D. Abdomen v b 



B. PARTIAL ORISMOLOGY. 

 I. BODY (CORPUS). 



1. DISJUNCT (Disjunctum). When head, trunk, and 



abdomen are separated by a deep incisure. Ex. 

 ' Hymenoptera y Diptera. PLATE IV. FIG. 2, 3, 5. 



2. COMPACT (Compaction). When head, trunk, and 



abdomen are not separated by a deep incisure, but 

 inosculate in each other. Ex. Buprestis, Elater, 

 and many other Coleoptera^ Ortkoptera, and He- 

 miptera. 



3. BISECT (Bisection}. When the head and trunk are 



not separated by a suture, so that the insect con- 

 sists only of two pieces. Ex. Araneidea. PLATE V. 

 FIG. 4. 



4. COALITE (Coalituin). When neither head, trunk, 



a As this work is intended for general readers as well as for the 

 learned, the above rules, &c. it is hoped will not be deemed with- 

 out use. 



b These symbols are inserted here, because they may be very con- 

 veniently adopted in a correspondence on the subject of Entomology, 



