XV, 4 



Oshima: Formosan Termites 



331 



with a much larger head, measuring 0.91 to 0.94 millimeter 

 long and 0.88 to 0.91 millimeter broad; while the latter has a 

 smaller head, measuring 0.84 to 0.91 millimeter long and 0.84 

 millimeter broad. This distinction between the two forms is 

 observable in the earlier stage when the larvae are provided with 

 11-jointed antennae. 



Nymph of royal form. — Head, thorax, and abdomen milk 

 white ; eyes nonpigmented ; head and pronotum sparingly pilose ; 

 wing pads with a few short hairs; abdominal tergites densely 

 covered with minute hairs. 



Head round, slightly broader than long; fontanelle spotted, 

 round and white, situated at center of head; eyes round and 

 prominent; ocellus separated from eye by a distance equal to its 

 diameter; postclypeus short, anterior border nearly straight, 

 shorter than posterior; anteclypeus as long as postclypeus, with 

 rounded anterior border; labrum tongue-shaped, sides slightly 

 converging posteriorly, tip and cutting margin of mandibles 

 dark brown; antennae 19-jointed, second joint longer than third, 

 fourth joint nearly as long as second, semidivided; pronotum 

 semicircular, anterior border concave, posterior border indented 

 at middle, anterolateral corners rounded; lateral parts of meso- 

 notum and metanotum much produced posteriorly, forming primi- 

 tive wing cases, which are provided with rudimental veins. 



Measurements. 



Length of body 

 Length of head 

 Width of head 

 Width of pronotum 

 Length of pronotum 



mm. 



8.50 

 1.15 

 1.31 

 1.40 

 0.93 



THE FOUNDATION OF A NEW COLONY 



In Formosa the swarming of Coptotermes formosanus takes 

 place at the end of May or early in June, while in Japan proper 

 the winged individuals swarm a little later; that is, at the end 

 of June. 



Table I. — Records of the swarming season of Coptotermes formosanus. 



Year. 



1912 

 1913 

 1914 

 1915 

 1916 

 1917 



Formosa. 



No record 



June 1; at Taihoku 

 June 3; at Taihoku 

 June 1; at Taihoku 

 June 4; at Taihoku 

 June 8; at Taihoku 



Japan proper. 



June 12 to 19; at Marugrame. 

 June 26; at Mitajiri. 

 June 25; at Gifu. 

 No record. 



Do. 



Do. 



