92 ENTOMOLOGY. 



existing in museums,, the beetles are so different from all 

 other insects that, with the exception, perhaps, of the two 

 families StylopidcB and PlatypsyllidcB, no one would con- 

 found them with the members of any other order. Beetles 

 differ from other insects in the nature of the fore wings, 

 which are usually thick and solid, generally without dis- 

 tinct veins, and serve as sheaths (elytra] to protect that 

 part of the body situated behind the prothorax, which is 

 large, broad, and moves freely on the rest of the thorax; 

 while the mouth-parts are free and adapted for biting. 



In order to learn the names of the different parts, the 

 beginner should have specimens of a ground-beetle and of a 

 may-beetle, and compare them with Figs. 83 and 84. This 

 will save pages of dry description. How the antennae vary 

 in form in different beetles may be seen by reference to Fig. 

 85, while Fig. 86 represents the different forms of eyes. The 

 jaws vary much in shape, while perhaps the extreme of 

 variation in the maxillae is seen in many species of Nemog- 

 natha, in which the outer lobe is generally prolonged into 



Horn, G. H. Descriptive catalogue of species of Nebria and Pelophila 



(Trans. Am. Ent. Soc., ii., 1870). 

 Synopsis of Malachidre of U. S. (Trans. Am. Ent. Soc., iv., 



1872). 



- Brenthidse of U. S. (Trans Am. Ent. Soc.,iv., 1872). 



Revision of species of Lebia (Trans. Am. Ent. Soc., iv., 1872). 



- A monograph of the species of Chrysobothris inhabiting the 

 United States (Trans. Am. Ent. Soc , xiii., 1886). 



A monograph of the Aphodiini inhabiting the United States 



(Trans. Am. Ent. Soc., xiv., 1887). 

 Lacordaire, J. T., et Chapuis. Genera des Coleopteres (i.-vii. Paris, 1854). 

 LeConte, J. L., and G. H. Horn. The Rhychophora of America north of 



Mexico (Proc. Am. Phil. Soc., 1876). 

 Classification of the Coleoptera of North America (Smithsonian 



Inst., 1883). 

 Schaupp, F. G. Synopsis of the Cicimlelicte of the U. S. (Bull. Ent. 



Soc., Brooklyn, vi , 1884. Five plates ; every species with a colored 



figure, on four plates.) 

 Stal, C. Monograph of American Chrysomelida? (Upsala, 1862-5). 



Also articles by Austin, Blnnchard, Casey, Fitch, Fuchs, Harris, Hub- 

 bard, Matthews, Melsheimer, Randall, Say, Schwarz, J. B. Smith, 

 Ulke, Ziegler, Zimmenuann and others in Trans. Am. Ent. Soc. 

 Phil.; Bull. Brooklyn Ent. Soc.; Entouiologica Americana; Can. 

 Entomologist, etc. 



