478 



CLAUDE FULLER. 



articulation of mandibles forming- two dark spots ; lateral 

 edges and teeth of mandible dark brown ; cephalo-f rontal 

 suture a little darker; eyes distinct, with black centres, as 

 with soldiers. 



Antennas smoky black, ringed with white ; 19, 18 or 

 17 joints; the XVIII-jointed antennas the most fi-equently 

 met with, the XlX-jointed appears to be due to the sub-division 

 of III of XVIII, the XVII-jointed to the fusing of III and 

 IV of XVIII. In the XlX-jointed form. III, IV and V are 

 the smallest, V being a little shorter than III or IV. In the 

 XVIII-jointed form IV is the smallest and represents the 

 unaltered V of the XlX-jointed form. In the XVII-jointed 

 form IV is a large joint between two smaller joints. The 

 following approximate measurements (in /u) of the three forms 

 of antennas from insects of the one nest-series will illustrate 

 the reduction in the number of joints.^ 



Minor Worker. 



Measurements, — Total length 3 to 4*5 mm. ; head-width 

 I'l to 1'3 mm. Very much like the major worker ; generally 

 with XVII-jointed antennae ; antennge simulating the XVII- 

 jointed form of the major worker. 



^ See also introdxactiou to Section Y, p. 419. 



