COLEOPTERA. 39 



characterised by a strongly marked peculiarity of structure which it 

 is impossible to overlook. * Mr. MacLeay is, however, of a different 

 opinion ; and, rejecting the tarsal system entirely, has proposed a 

 division of the Coleoptera, founded upon their larva state, of which he 

 describes the five following types . — 



1. A carnivorous Hexapod larva, with an elongated linear and 

 flattened body, having a large head armed with two sharp falciform 

 mandibles, and furnished with six granular eyes on each side. Ex- 

 amples, Carabus, Dyticus. [Analogy with Scolopendra.] 



2. An herbivorous Hexapod larva, with along and almost cylindri- 

 cal body, so fashioned that the posterior extremity being curved under 

 the breast, the animal, when at rest, necessarily lies like an lulus on 

 its side. Examples, Petalocerous LarvK. [[Analogy with lulus.] 



3. An Apod larva, having scarcely the rudiments of antennae, but 

 furnished, instead of feet, with flat fleshy tubercles, which, when con- 

 tinued along the back and belly, give the animal a facility of moving 

 in whatever way it may be placed. Examples, Curculio or Cerambyx. 

 [Analogy with Vermes.] 



4. An Hexapod and distinctly antenniferous larva, with a subovate 

 leather conical body, of which the second segment is longer and of a 

 different form from the others, so as to give the appearance of a thorax. 

 Examples, Coccinella or Chrysomela. [Analogy with Pediculus.] 



5. An Hexapod antenniferous larva, of oblong form, having, like the 

 former, vestiges of a thorax, besides two or more articulated or un- 

 articulated appendages to the last segment of the abdomen. Example, 

 Meloe. [Analogy with Podura.] 



" Each Coleopterous larva, I have observed, may be assimilated 

 to one or other of these types, which it is scarcely possible to look 

 at without being reminded of the primary types of the Ametabola. 

 Indeed, it occurred tome almost immediately, that I had Chilopodi- 

 form, Chilognathiform, Apod or Vermiform, and Anopluriform larva^, 

 with a fifth form (Thysanuriform), of which, even now, I know little, 



* Several French entomologists (Solier, Chevrolat, Brulle) have very recently 

 rediscovered this minute joint, to which they have attached as much importance 

 as IMr. jMacLeay. The advantages resulting from the discovery are not very 

 apparent when the Longicorn Beetles are separated from the other Tetramera, and 

 brought into the Pentamera, as proposed by Mr. Brulle. M. Solier also (Ami. 

 Soc. Ent. Fr. 183-^, pp. xlii.), considers that all the Coleoptera are in fact 

 Pentamerous. 



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