704 EXTERNAL ANATOMY OF INSERTS. 



7:6. Dytiscus?. 9:1.. Perga Leach ?. 



7:7. Ammopkiia, &C« 9:8. Perga$. 



(Dytisclis (?. 10:7. Locusta Leach ?. 



(Lucanus, &c. 10:8. J. 



8:7. Geotrupes Latr. 10:10. JEshna* 



8:8. Pimpla. 11:7. Phasmd. 



8:10. Enchlora M C L. a ? 11:9. Chelifer. 



8:13. Scutigera. 12:11. Thelyphonus, 



9:5. Carabus Latf. Many: Myriapoda. 

 9:6. Gymnoplenrus 111. 



I shall next explain the articulation of the segments 

 with each other, both that of the rings formed by the 

 union of the dorsal and ventral pieces, and that of those 

 pieces themselves. In general it may be stated with re- 

 spect to the former, that each ring is suspended by liga- 

 ment to that which precedes it; but this takes place in 

 three ways — in some the margins of the suspended rings 

 touch each other only, with little or no inosculation ; 

 in others the dorsal segments only touch, and the base 

 of each ventral is covered more or less by the apex of 

 the preceding one ; and in others again the base of the 

 whole ring, both above and below, is so covered, or 

 inosculates. The first kind here mentioned you will 

 find exemplified in Melolontka, Geotrupes, Musca, &c; 

 the second in Scorpio; and the third in Staphylinus, the 

 Hymenoptera, and many others. In the Coleoptera, says 

 M. Cuvier, speaking of the movements of the abdomen, 

 the rings only touch each other at the margin, and the 



a In this genus the bed of the posterior coxae appears to consist 

 of two segments, which are beautifully fringed with parallel short 

 bristles. 



