i6 



Jl" 'HEELER. 



[VOL. II. 



This seems to be the universal rule in ant larvae. The head 

 in dorsal view is represented enlarged in Fig. 6, b. The power- 

 ful dentate mandibles lie just below the outer edges of the 

 bilobed labrum ; still lower and projecting forward lies the 

 labium, bearing on its tip the opening of the spinning gland 

 (to be used in weaving the cocoon), and on either side two peg- 

 shaped tactile (?) organs. Similar but somewhat larger organs 

 are seen on the edges of the maxillae, which protrude on either 

 side below the mandibles. The ten tracheal stigmata, begin- 



FIG. 5. Odontomachus haematodes Linn, a, young larva ; />, tubercle of the same. 



ning on the mesothoracic and terminating on the eighth 

 abdominal segment, are clearly shown in Fig. 6, a. The bristly 

 tubercles are essentially the same in structure as those of the 

 younger larva, but they are relatively shorter and smaller. 

 (Cf. Fig. 5, b, and Fig. 6, c.) 



The larvae of Leptogenys (Fig. 7) are remarkably slender 

 and scarcely flattened on the ventral surface. In the young 

 larvae (Fig. 7, a) the tubercles are distinctly curved and pointed, 

 without apical bristle, and with only a few rather short bristles 

 encircling the base (Fig. 7, d). In the adult larvae (Fig. 7, b 

 and e) the tubercles are larger and shorter, with blunt or 



