BY GERALD P. HILL. 267 



Head and thorax with scattered reddish hairs. Antennae (Fig. 14) 15- 

 jointed, 3rd and 4th joints small, 5tli rather smaller than 6th. 



Abdomen moderately setaceous, with median dorsal stripe as in soldier. 

 Cerci (Fig. 15) short, acuminate. 



Measurements : 



Total length 5.00. 



Head: wide 1.270 — 1.410; from posterior margin of dypeus to hase, long 

 1.175—1.222. 



Mandibles: left, long 0.520—0.564, wide 0.420—0.470; right, long 0.470, 

 wide 0.517. 



Prothorax: long, 0.517; wide, 0.90—0.94. 



Tibia iii. 1.034—1.081. 



Affinities. — The imago is easily distinguished from C. lacteus Frogg. by its 

 less setose, much larger and darker head (hazel in C. lacteus Frogg.), much 

 darker thorax and abdomen, yellow ventral surface, much shorter and darker 

 wings, absence of minute Y-shaped marks on wing membrane, larger abdomen. 

 From C. acinaciformis Frogg. it differs still more markedly; its dark colour alone 

 will serve to separate the species. The, imago of C. michaelseni Silv. is not 

 known. 



The soldier caste differs from C. lacteus Frogg. in having a larger and darker 

 head, reddish setae on head, thorax and abdomen (pale in C. lacteus), larger and 

 darker frontal opening, darker abdomen and presence of median dorsal stripe. 

 From C. acinaciformis Frogg. it differs in the above characters, except the lasi. 



Described from a nest series of imagos, soldiers and workers, and from two 

 series of soldiers and workers from S.W. Australia (Wonnerup, J. Clark, October, 

 1920; Mt. Barker. J. Clark, November, 1920; Swan River, C. F. Hill, February, 

 1921). 



Types of imago and worker in writer's collection ; co-types in Mr. Clark's 

 collection. 



All figures outlined with camera lucida. Figures 8, 13 and 15 drawn to same 

 scale. 



List of References. 



Desneux, J., 1904. — Gen. Insectorum. Isoptera, Fam. Termitidae. 



Froggatt, W. W., 1896-7. — Australian Termitidae, Part ii. Proc. Linn Soc. 

 N.S. Wales, xxi., pp. 510—552; Part iii. Id., xxii., pp. 721—758. 



Froggatt, W. W., 1915.— White Ants. Dept. of Agrie. N.S.W., Farmers' Bulle- 

 tin No. 60 (2nd Ed.). 



Hagen, H., 1858.— Catalog. Neurop. Insects in Coll. Brit. Mus. Part 1. Ter- 

 mitidae, p. 23. 



Holmgren, N., 1911. — Termitenstudien. ii., Systematik der Termiten. Kungl. 

 Svenska. Vetenskapsak., Handl., Vol. 46, No. 6. 



, 1912. — Termitenstudien. iii.. Die Familie Metatermitidae. 



M.JoBERG, E., 1920. — Results of Dr. E. Mjoberg's Swedish Scientific Expeditions 

 to Australia 1010—1913. 19. Isoptera. Arkiv. for Zoologi, Bd. 12, No. 15. 



Ridgwat, R., 1912. — Colour Standards and Nomenclature. 



SiLvESTRi, F., 1909. — Die Fauna Sudwest-Australiens. Isoptera, Band ii.. Lief. 

 17. 



Wasman, E., 1900. — Descr. of a Termite associated with a Pselaphid. Proc. Linn. 

 Soc. N.S. Wales, xsv., p. 244. 



