STATES OF JNSECTS. 163 



thoracic shield. Example: Psoais, Coccinella> most 

 Hemiptera a . 



2. Thysanuriform. Polyphagous; hexapod; antenniferous : 



body with segments of trunk distinctly marked; anus 

 often furnished with setae or mucro. Ex. Meloe b ? 

 Thrips, Aphis. 



3. Chilopodiform. Carnivorous; subhexapod; antennife- 



rous : body depressed, elongate, linear, with falcate 

 acute mandibles, a distinct thoracic shield, and an 

 anal proleg. Ex. Cicindela c ? Carabus L. 



4. Chilognathiform. Herbivorous: body subcylindrical, 



elongate, linear; no thoracic shield; often many pro- 

 legs, sometimes a retractile one, and sometimes none. 

 — Ex. Elate?; Petalocera, most Lepidoptem^ Ten- 

 tliredo L. d 



5. Vermiform. Polyphagous ; apod or hexapod : with 



very short legs; antennae nearly obsolete; body 

 fleshy, plicate, with sides often plicato-papillose ; 



a Plate XVIII. Fig. 1. as to the thoracic shield. 



b May 27, 1822. This day, T. Allen, Esq. F.L.S. brought me in 

 a phial a vast number of the little insect which Goedart, Frisch, and 

 De Geer took for the larva of Meloe Froscarabceus, which he found 

 on the leaves of Achillea Millefolium. These little animals were 

 coursing each other with wonderful velocity over the sides of the 

 phial. To assist them in their motions, they applied to the surface 

 of the glass the end of their abdomen, using it, like many larva? of 

 Coleoptera, as a seventh leg. This circumstance excited a suspicion 

 in the minds of both Mr. MacLeay sen., then visiting me, and my- 

 self, that after all they might be coleopterous larvae. One, amongst 

 other circumstances, however, seemed to militate strongly against 

 this opinion ; namely, that in this infinite number none appeared to 

 differ in size. 



c Plate XVII. Fig. 13. 



•» Ibid. Fig. 12.; Plate XVIII. Fig. 4, 11, 13, &c. 

 M 2 



