SUCTORIAL TYPE OV LARV^. 



61 



has nevertheless preserved, in such as belong to this 

 type, the strongest and most beautiful analogy to animals 

 of such habits. The Hesperidce, or skipper butterflies, 

 unlike all others of the tribe, are enclosed and covered, 

 in their larva state, from the air; not, indeed, in water, 

 but within the folds of a leafy case, fabricated by the 

 animal itself, and which it never quits except as a 

 winged insect. The name of anopluriform had better, 

 perhaps, be retained to the examples of this type among 

 the diurnal Lepidoptera ; this epithet having been be- 

 stowed upon it from the resemblance borne by the cater- 

 pillars to the anopluriform apterous insects, or bird 

 lice, of Dr. Leach. But let us enumerate more par- 

 ticularly the character of these larvae. First, then, the 

 head, which in the two former is of moderate size, in 

 this type is always disproportionably large, thick, and 

 obtuse, yet it is never decorated with horns or append- 

 ages : the body is not long, but rather inclined to 

 shortness ; the hinder extremity, however, is always 

 much thicker than the fore part, so that it frequently 

 seems to end very abruptly : the surface is generally 

 smooth and naked, nor is their any appearance of spines, 

 tubercles, or other appendages. These caterpillars, 

 more than any other, resemble the fat maggots of flies ; 

 while their bodies, being sufliciently protected by the 

 covered habitation they fabricate, are usually soft : the 

 legs are small and weak, because there is little use for 

 them ; the caterpillar being, as it were, sedentary. In the 

 natatorial or anopluriform type of other animals, the 

 legs are generally wanting. 



(58.) The Suctorial, or Vermiform type, is one of 

 the most remarkable types, in the variation of its struc- 

 ture, and in the apparently contradictory forms under 

 which it appears. There is one peculiar distinction, 

 however, by which it may generally be recognised ; 

 this is, in the sraallness of the heads of these caterpil- 

 lars, destitute, at the same time, of any thing like ex- 

 traneous appendages. It follows, from this circum- 

 stance, that the mouth is particularly small ; while the 



