HUNTING 53 



pillars during the weeks of their feecling-time ; it re- 

 quires regularity, carefulness, and some exercise in 

 keeping up the supply of leaves ; but the results pay 

 for the work, and it is all interesting. 



For convenience in describing, the body of a cater- 

 pillar is mapped out in sections, each area being given 

 a name, and the lines separating them being named 

 also. These lines may be only imaginary, or there may 

 be one or more of them as actual marks on the larva. 



The plan of the caterpillar shows the lines which 

 bound these areas. It is not a drawing of any real 

 caterpillar, but merely a map or plan of caterpillar 

 surface and appendages on one side. 



The dorsum, or dorsal area, is the back, included be- 

 tween the subdorsal lines on the two sides {y-y). It 

 is bisected by the dorsal line. 



The lateral area is that bounded by the subdorsal 

 {y-y) and sublateral lines (^-^), and is bisected by the 

 lateral line. 



The stiymatal area is that between the sublateral 

 {z-z) and substigmatal {s-s) lines, and is bisected by 

 the stigmatal line. 



The venter, or ventral area, is that between the legs 

 and props, extending from head to anal end, and is 

 bisected by the ventral line. Between this area and 

 the substigmatal line is the subventral line or area. 



The most common marks on caterpillars are the 

 dorsal line; the subdorsal line; the obliques, or 

 oblique lines, of sphingid larvae, often extending across 

 two or three areas; the sublateral line, frequently 

 present on the thoracic segments only ; and the stig- 

 matal line. 



