X INTRODUCTION. 



A comb-like or pectinate process from tlie under side of tlie anten- 

 nae is called lamellate, fig. 17. P'requently the processes themselves 

 are ciliated, the pectinations equal on both sides, and the pyra- 

 midal teeth usually furnished at their summit with short cilise. 



THORAX. Figs. 1, 2, k. 



Pisf. 1. ri<r. 20. 



al 



l.s^D 



md 



The thorax in front, bears the head ; behind, the abdomen ; be- 

 neath, the legs, and on the sides, the wings; the fore part, collare, 

 1, and the shoulder-covers, scaptdcB, ra, which cover the roots of 

 the wings, are often prominent. Besides this, the scales above often 

 form peculiar elevations. 



ABDOMEN. Figs. 1, 2, n. 



This consists of six to seven rings, the segments of which are 

 for the most part discernible under the scales. These segments 

 often have above, or on the sides or behind, tufts of hair. 



IMG^, pedes. Figs. 2, 19. 



There are three pairs of legs, pedes antici, A, pedes medii, B, 

 and pedes postici, C. They are composed of the coxa, by means 

 of which the leg is inserted into the body, o, the trochanter, p, 

 which unites the coxa and i\\Q femur, q; the tibia, r, and the feet, 

 tarsi, s. The tihicB have usually two spurs, crdcares, t, at the end; 

 the hind tibiae often have two behind the middle, u ; the fore tibia; 



