22 Claude Fuller 



(2) Tips of mandibles plainly up bent. 



a. Head shorter than body ; mandibles prominent, 

 teeth large; labrum short, wide, appears rounded; 

 eyes large, coneolorous with head. Calotermes. 



b. Head almost as long as body, very characteristic; 

 in front decidedly truncate and with a distinct 

 frontal cavity ; cavity overhung by a sculptured 

 ridge ; mandibles short, triangular with small 

 teeth; labrum triangular; eyes small, usually in- 

 distinct. Cryptotermes. 



C. Heads lenticular, flatly arched, oval or sub-oval in dorsal 

 outline; without facetted eyes. 



/(I) Labrum characteristic. 



a. Labrum with a deep median groove and fim- 

 brinate tip; fontanelle large; mandibles short and 

 with acute teeth. Schedorhinotermes. 



b. Labrum not grooved, triangular, with a distinct 

 cordate, fleshy tip. Macrotermes. 

 [Labrum forked like prongs of catapult; head 

 abnormal. CuMtermes, et ante.] 



(2) labrum excluded, except us a secondary character. 



a. Mandibles sickle-shaped (characteristic) ; both 

 alike ; both furnished with one strong tooth, the 

 point of which is directed backwards. Hamitermes. 



b. Mandibles without teeth on cutting margin. 

 Mandibles strong, sword-shaped, tips inbent and 

 upcurved. 



(i) Large insects: soldiers of two sizes; labrum 

 with cordate fleshy tip. Smallest soldiers 

 as large or larger than largest workers. 



Macrotermes (et ante). 



(ii) Small insects : soldiers about one size ; 

 labrum triangular, tip not fleshy. Soldiers 

 not larger than largest workers. Microtermes. 

 [ Small insects : head abnormal ; mandibles 

 blade-like. CuMtermes and 



Procuhiterm^s^ 

 [Mandibles rod-like. Mirotermes.\ 



c. Left mandible only with one strong tooth (like a 

 step) on cutting margin. Tooth placed at half 

 length. Right mandible may exhibit a faint 

 tooth opposite that on left. In most species, 

 soldiers only a little larger than largest workers. 



Termer (Termes). 



d. Both mandibles dentate. 



(i) Soldiers with facetted eyes. 



aa. Head broadly oval or round, slightly 

 arched; mandibles massive, with large 

 sharp triangular teeth; eyes black and 

 conspicuous. Pronotum distinctly sel- 

 late. Eodotermes. 



