12 TNTEOUUCTOUY KEMAEKS. 



manifested a clear analogy to a corresponding division of Ame- 

 tabola ; namely, — 



First A larva of a linear oblong form, attenuated at both ends, 

 depressed or cylindrico-convex, of a sluggish appearance, with short 

 and scarcely perceptible feet, distinctly marked atove with trans- 

 verse striae. A pujja nearly smooth, or with comparatively few 

 protuberances, very obtuse at the anterior extremity, attached by 

 the abdomen, braced, vertically suspended with the head upwards 

 or tending forwards in a horizontal direction. Representing the 

 Vermiform Ametabola. 



Secondly. A larta of a cylindrical form, generally swelled or 

 thickened at the fourth or fifth section of the body, attenuated 

 towards the head and posterior extremity ; in the typical genera 

 naked, or covered with short, obtuse, fleshy protuberances ; in the 

 extreme genera, at the boundary of the neighbouring groups, 

 covered with a close silky down, or with short scattered hair, most 

 remarkably distinguished by a furcula or forked tentaculum, situ- 

 ated between the head and neck, which may be drawn back or thrust 

 forward at pleasure. Piipa augulated and mostly tuberculated ; in 

 the typical genera, and in those at the confines of the first group, 

 attached by the posterior extremity, braced, and vertically sus- 

 pended with the head upwards ; in the genera approaching the 

 third stirps, perpendicularly suspended, according to the habits 

 of that stirps. Representing the Chilognathiform or JuUform 

 Ametabola. 



Thirdly. A cylindrical larva, strikingly characterized by its 

 terrific or threatening aspect, being covered with sharp, rigid, erect 

 processes, often of great length, but diversified in the different 

 subdivisions, arranged in regular longitudinal lines along the body 

 of the larva, and beset with numerous diverging spines disposed in 

 a verticillate manner. The attitude of the pupa is the reverse of 

 that of the typical forms in the two former divisions : it is attached 

 by the abdomen, while the head is directed perpendicularly down- 

 wards ; in form it is greatly diversified. Representing the Chilo- 

 pud.iform or Scolopendriform Ametabola. 



Fourthly. A lengthened cylindrical striated larva, somewhat 

 smaller at each end, apparently of an agile habit, naked, or covered 

 \\ith a slight down, having a head of moderate size, armed with 

 two erect spines, or provided with a movable shield, often of great 





