STATES Or INSECTS. 169 



convex and the other flatter, so as to give the idea of an 

 Armadillo and of an Oniscus. 



Strepsiptera. Larva Vermiform. 



Dermaptera. Larva Thysanuriform. Type Podura or 

 Sminthurus. 



Orthoptera. Mr. MacLeay considers the larvse of this 

 Order as primarily Thysanuriform a , though he allows 

 the resemblance between them and Amphipoda to be par- 

 ticularly striking 5 . For my own part, their prototypes ap- 

 pear to me to be in the Crustacea, and their analogical re- 

 lations to the Thysanura much more distant. I trust this 

 will appear to you the reverse of dubious in a progress 

 through the Crustaceous Orders. I begin with the Iso- 

 poda. Take the larva of a Blatta, and place it between 

 a Lepisma, or Machilis, and an Oniscus, or Porcellio ; 

 you will find that in shape and width, and the form of its 

 anal styles, it resembles the latter much more than it does 

 the former, with which it possesses scarcely any character 

 in common, except its multiarticulate antennae. It is re- 

 markable, that amongst the Blattida we meet with spe- 

 cies that represent both the Oniscidce and Armadillo or 

 Glomeris c , the latter being more convex than the former. 

 In their habits the Blattae certainly agree with Lepisma ; 

 and Dumeril, who thought the latter and Podura sub- 

 ject to a metamorphosis, imagined they were related d . 



The Spectres of Stoll {Phasma F.) are so strikingly 

 analogous to another crustaceous tribe, the Lcemodipoda, 

 particularly the genus Caprella, that Montagu gave one 

 species the Trivial name of Phasma e . The jumping Am- 



a Hor. Entomolog. 397. " Hid. 399. c Ibid. 438. Note *. 



d Traite Element, ii. 35. n. 577. 



" Trans. Linn. Soc. vii. 6b". t. \i.f. 3. 



