164* STATES OF INSECTS. 



no distinct thoracic shield. Ex. Cvrculio L., Ce- 

 rambyx L., Musca L., and many other Diptera a . 



6. Araneidiform. Carnivorous ; hexapod : body very 



short ; mandibles long, suctorious ; animal lying in 

 wait for its prey in a pitfall it has prepared; motion 

 retrogressive. Ex. Myrmeleon L. b Cicindela ? 



7. Isopodiform. Saprophagous ; hexapod; antenniferous, 



with longer antennae : body oblong ; thoracic shield 

 distinct; anus styliferous or laminiferous. Ex. 

 Blatta L. Silpha L. ? 



8. Onisciform. Herbivorous ; polypod ; antenniferous : 



body short, oblong, depressed, margined. Ex. Ery- 

 cina, Lyccena, in the Lepidoptera, and some species 

 of Tenthredo L. c 



9. Idoteiform. Subcortical; hexapod; antennae obso- 



lete : body much depressed, with the last segment 

 elongate, terminating in three or more mucros. Ex. 

 Larva from Brazil. Perfect insect at present un- 

 known. 

 I have placed this larva, which was described above d , 

 amongst crustaceous forms, because of the remarkable 

 resemblance which the last segment of the body bears to 

 that of the Idoteidce ; but I do it with considerable hesi- 

 tation, since in other respects its type seems to be in the 

 Ametabola. In its want of antennae, very short legs, and 

 ventral asperities, it resembles some of the Vermiform 

 larvae ; in its small head, distinct thoracic shield, and ob- 

 long shape, it approaches the Anopluriform : and in its 



a Plate XVIII. Fig. 3, 9. ■> Plate XIX. Fig. 8. 



c Ibid. Fig. 3. Reaum. v. 97. t. xii./. 17, 18.; De Geer ii. 1004. 

 t. xxviii./. 12. 

 « See above, p. 1 10, 114, 138, 142. 



