BEETLES. 7 



The compound eyes (Fig. 6) of most beetles are prominent, 

 and are of various forms : round, oblong, kidney-shaped, curved, 

 or in one case even divided in the middle, thus giving the impres- 

 sion that the insect possesses four instead of two eyes (Fig. 7). 

 Each eye is composed of many six-sided facets, varying in number 

 from a few to manv hundreds. Some beetles found in caves have 



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Fig. 8 — Serrate Antennie and modifications: 1, serrate; 2, pectinate; 3, bi- 

 pectinate; -i. flabellale; 5. plumose; 6, 7, 8, irregularly serrate, approaching the 

 Clavicorn type. After Leconte and Horn. 



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Fig. 9. — Clavate Antenna, 1-10; Capillary and Vetticillate, 11; Moniltiform, 12; 

 Lamellate, lci-15; Irregular, 16. After Leconte and Horn. 



no eyes at all. Ocelli, or single eyes, do not often occur, though 

 some beetles have tw'o or even only one ocellus. The compound 

 eyes of snout-beetles are usually small and round. 



The feelers or antennae of beetles possess various forms, some 

 of which are exceedingly singular and beautiful, resembling feath- 

 ers. A number of such feelers are shown in Figs. 8 and 9. To 



