480 CLAUDE FULLER. 



V next. In the XVI-jointed form III frequently shows a 

 pseudo-articulation, and its comparatively large size is due to 

 the fact that it represents III, IV and V in the XVIII-jointed 

 expression found in the worker castes ; the proportion of III 

 to IV is not constant because the proliferation of the joint is 

 arrested to varying degrees. 



Gula much darker than ventral gen?e ; very broad, nearly 

 half the breadth of the head ; sides straight parallel. Free 

 apex short, narrowed ; distal margin straight, sides diverging 

 and faintly incurvate. 



Thorax. — Transparent, concolorous with abdomen. 



Pronotum sellate ; cephalic mai-gin bilobed ; sides curvate, 

 tapering roundly into incurvate hind margin ; cephalo-lateral 

 corners rounded. 



Mesonotum sub-elliptical ; shorter and narrower than 

 pronotum ; sides curvate, more or less parallel ; caudal margin 

 incurvate. 



Metanotum shorter and wider than mesonotum ; sides 

 curvate, diverging ; caudal margin straight or slightly incur- 

 vate. 



Legs pallid or pale broAvn-yellow. 



Majoe Worker. 



Measurements. — Total length 5'5 to 7*5 mm.; head- 

 width 1*7 to 1'9 mm. 



Head. — Pale red-brown ; Y-suture darker, Avith an insig- 

 nificant pale spot in fork ; clypeus paler than epicranium, with 

 a fine median brown line ; epistome pale yellow-brown ; 

 clypeo-frontal suture dark ; labrum-epipharynx pale brown; 

 eye-spots insignificant. 



Antennae XVII- or XVIII-jointed, more frequently XVII- 

 jointed. In the XVIII-jointed antenna, IV is the smallest 

 joint ; in the XVII-jointed, III is the smallest and V next 

 because IV and V of the XVIII-jointed form have failed to 

 separate ; this failure is often indicated by pseudo-articulation 

 in IV of the XVII-jointed form. 



Legs pallid. 



