138 INSECTA. 



the first joint of the posterior tarsus very large and compressed 

 in the form of a square or triangular face. 



SUBGENUS BOMBUS, Lat. 



Corselet much larger than the head ; posterior legs spiny. 



SUBGENUS APIS PROPER. 



Head and corselet equal in width ; posterior legs without 

 spines ; first articulation of the tarsus squared. 



ORDER VII. LEPIDOPTERA. 



Four membranous wings covered with little coloured scales ; 

 mouth forming a rolled proboscis, produced by an elongation 

 of the jaws, upon the sides of which are found the rudiments 

 of mandibles and downy palpi. Metamorphosis complete ; 

 larvae called caterpillars- of which some feed upon leaves, 

 others, less common, gnaw the ligneous part of trees, soften- 

 ing it with a saliva which they disgorge ; some live at the 

 expense of woollen stuffs and furs. The nymphs are almost 

 always motionless, and generally spin a cocoon to effect the 

 metamorphosis. 



FAMILY I. DIURNA. 



Wings vertical during repose ; antennae terminated, in ge- 

 neral, by a small round club, at other times tapering at the 

 end and reflexed into a hook; caterpillars almost always 

 provided with sixteen feet; chrysalis hardly ever enclosed 

 in a cocoon, but suspended in the air by the posterior extre- 

 mity of the body. 



GENUS PAPILIO. Butterfly. 

 SUBGENUS PAPILIO PROPER. 



The six feet adapted to walking ; inferior palpi very short, 

 hardly reaching the hood. 



SUBGENUS PARNASSIUS. 



Six feet adapted to walking; inferior palpi elevated beyond 

 the hood and with three joints. 



