272 OR1SMOLOGY. 



Broader at the has eand apex Ex. The Proster- 

 num of many Capricorn beetles. 



24. CLAVATE (Clavata). Club-shaped. Linear at the 



base, but towards the apex growing gradually 

 broader. PLATE XI. FIG. 4. 



25. QUADRATE ( Quadrata ). Square. Quadrilateral 



with the sides equal and the angles right angles. 



26. RHOMBOID (Rhomboidea). Quadrilateral with the 



sides equal, but with two opposite angles acute, and 

 two obtuse. PLATE XXVII. FIG. 62. *". 



27. TRAPEZATE (Trapezata). Quadrilateral with the 



four sides unequal, and none of them perfectly pa- 

 rallel. PLATE XIV. FIG. 4. 



28. TRAPEZOID (Trapezoidea}. Quadrilateral, with two 



sides unequal and parallel a . PLATE XXVI. 

 FIG. 34. b'. 



29. PARALLELOGRAMICAL (Par allelogr arnica). Qua- 



drilateral, with all the angles right angles, and all 

 the sides parallel, but two longer than the others. 



VI. FORM". 



1. SPHERICAL (Sphterica}. The shape of a globe. A body 



whose diameter every way is equal. PLATE XX. 

 FIG. 5. 



2. ORBICULATE ( Orbiculata ) . A depressed globe, 



whose horizontal section is circular, and vertical 

 oval. PLATE XX. FIG. 10, 11. 



3. LENTICULAR (Lenticular is). Lens-shaped. Whose 



a We have departed from the more usual definition of trapezoid, 

 " An irregular figure whose four sides are not parallel," because the 

 above is best suited to forms in insects. 



b We use this term to denote the shape of solid bodies. 



