116 GRAMMAR OF ENTOMOLOGY. 



the head in the manner of the main-spring of 

 a watch, or the Ionic volute in architecture. 

 When bearing this form it is exceedingly long, 

 slender, and pliable ; and the blades of each feeler- 

 jaw being internally grooved, unite and form a 

 honey-sucking tube : it has this form in butterflies. 



413. A lanceolate blade (lacinia lanceolata) 

 is when it is straight, flat, decreasing gradually 

 to a sharp point, incapable of any horizontal 

 motion, and employed by being thrust vertically 

 into the object on which its possessor feeds : it 

 has this form in blood-sucking gnats and flies. 



414. A leathery blade (lacinia coriaria) is 

 when it is composed of a tough, strong, and 

 flexible substance ; when this is the case, it 

 usually is very long, without horizontal motion, 

 parallel with the ligula, and unites with that part 

 of the mouth in forming a sucking-tube : it has 

 this form in bees. 



415. An obtuse blade (lacinia obtusa) is when 

 it is not produced into a conspicuous or active 

 form, but terminates the feeler-jaw in a rounded 

 and apparently undeveloped form. 



416. A falcate blade (lacinia falcata) is when 

 its point is acute, and bent over towards the 

 opposite blade : this kind of blade has its in- 

 terior edge, hirsute, dentate, or simple ; its point, 

 bifid or simple. 



417. An articulated blade (lacinia articulata) 

 is when it unites with the disk of the feeler-jaw 



