326 Philippine Journal of Science 1919 



Measurements of the worker. 



mm. 



Length of head 4.00 



Width of head 1-03 



Width of pronotum 0.69 



Distribution. — Formosa (Taihoku, Horisha, and Koshun) ; 

 Kotosho (Botel Tobago Island) . 



Remarks. — The present species is very closely related to Leuco- 

 termes speratus, from Japan proper. It is very hard to draw 

 a fast line between the imagoes of the two species; however, 

 the soldiers of the two species distinctly differ as follows: 



a 1 . Head narrow and long, 1.75 to 1.81 millimeters long, 1.03 to 1.09 milli- 

 meters broad; lateral borders of head straight and parallel; posterior 

 border of pronotum nearly straight L. flaviceps. 



a 1 . Head rather broad and short, 1.56 to 1.71 millimeters long, 1.06 to 

 1.09 millimeters broad; lateral borders of head convex, slightly con- 

 verging anteriorly; posterior border of pronotum clearly indented 

 at middle L. speratus. 



In addition, the swarming seasons of the two species are 

 quite different. The winged forms of L. flaviceps swarm in the 

 beginning of January, while those of L. speratus swarm in April 

 or May. 



Family METATERMITIM] Holmgren 



Genus ODONTOTERMES Holmgren 



Odontotermes (Cyciotermes) formosanus (Shiraki). Plate I, figs. 

 4 to 6. 



Termes formosana Shiraki, Trans. Ent. Soc. Jap. 2 (1909) 234; 



Oshima, Rep. Term. 3 (1912) 81, pi. 1, figs. 7, 26, 27; pi. 2, figs. 



11, 18. 

 Termes vulgaris Shiraki, Trans. Ent. Soc. Jap. 2 (1909) 233; Oshim\, 



Rep. Term. 1 (1909) 37, pi., figs. 9, 10; Zool. Mag. Tokyo 22 (1910) 



379; Rep. Term. 2 (1911) 7; Matsumura, Schiidl. u. Niitzl. Insekt. 



v. Zuckerrohr Formosa (1910) 2, pi. 1, figs. 2-4. 

 Odontotermes (Cyciotermes) formosanus Holmgren, Termitenstudien 



3 (1910) 38; Termitenstudien 4 (1913) 116, pi. 4, fig. 11; pi. 5, 



fig. 11; Hozawa, Journ. Coll. Sci. Tokyo 35 (1915) 105, pi. 3, figs. 



21-23, text figs. 26-28. 

 Odontotermes formosanus Holmgren, Annot. Zool. Jap. 8 (1912) 127. 

 Odontotermes {Cyciotermes) formosana Oshima, Philip. Journ. Sci. 



§ D 8 (1913) 278. 



Imago. — Head, thorax, and abdomen chestnut; anteclypeus 

 yellowish white; antennae, labial palpi, T-shaped marking and 

 anterolateral corners of pronotum, and legs brownish yellow; 



