ERIC MJÖBERG, ISOPTERA. 115 



different dimensions and proportions, being quite aware of 

 the difficulties of separating the half-grown or still younger 

 nests on that system. 



The nests of the 10 hitherto E ut er mes species Icnown to be nest 

 builders may be tabulated as jollows. 



I. Nest black, rounded, of brittle material, built on logs or in trees. 

 (Text Fig. 58 a, 62.) E. fumipennis Walk. 



II. Nest not black, not rounded, of barder material, never arboreal. 



A. Nest broader in diameter at the base than high. 



a. Nest very small, only up to 30 cm in diameter at the base. 



E. haatilis Fiiogg. 



b. Nest very much larger, about one meter in diameter at the 

 base and nearly as high. E. Tyriei Mjöb. 

 (Plate 3, Fig. 1.) 



B. Nest not broader in diameter at the base than high. 



a. Nest of moderate size, not growing higher than about one 

 meter. 



*. Nest up to a height of one meter. 



E. magnus Frogg. 

 **. Nest up to about 50 cm high. 



E. yarrabahensis Mjöb. 



♦**. Nest less than 50 cm high. E. tumuli Frogg. 



b. Nest of considerably larger size. 



*. Nest very broad, up to two meters in diameter, often 

 mushroom-shaped. 



(Text Fig. 13.) E. nigerrimus Mjöb. 



**. Nest not so broad, not more than about one meter or 

 less in diameter, more slender, never mushroom-shaped. 

 f. Nest very large up to 6 meters height, columnar in 

 form, a little more than one meter in diameter at 

 the base, swelling out a few feet above, running up 

 with a uniform width ^o the irregular, pointed sum- 

 mit, and the sides ribbed with projecting buttresses. 

 E. pyriformis Frogg. 

 (See Froggatt, White ants, Dprtm. agr. se. N. S. W. 

 1905, p. 38, 39.) 



tt* Nest up to four meters height, rounded at the base, 

 of a uniform diameter, but contracted at the sum- 

 mit into a rounded dome. E. triodice Frogg. 

 (See Froggatt, 1. c, p. 10.) 

 ttf. Nest up to two meters height, not rounded at the 

 base. E' kimberleyensia Mjöb. 



(.See Text Fig. 60.) 



