ERIC MJÖBERG, ISOPTERA. 107 



Measurements: Length of body with jaws 5 mm, length 

 of head with jaws 3 mm, length of head without jaws 1,8 2 

 mm, breadth of head 1,2 4 mm, length of prothorax 0,3 4 mm, 

 breadth of prothorax 0,4 6 mm. 



Worker. Whitish, elongate, head light reddish-yellow. 



Head rounded, longer than broad, flattened on the 

 summit; basal part of clypeus light yellow, divided by a 

 dark median suture, apical part whitish, labrum broad, 

 rounded; jaws broad, nearly rectangular, the left one with 

 two large apical teeth, a median, more obtuse tooth and a 

 projecting obtuse lower part, in the right one the median 

 tooth is much broader and more obtuse and the lower part 

 broader, but not projecting; antennsi 13-jointed, short, whitish, 

 joints short and rounded, gradually becoming more slender 

 towards the tip. 



Measurements: Length of body 4,3 mm, length of 

 head 1,03 mm, breadth of head 0,99 mm, breadth of abdomen 

 1,26 mm. 



Apparently closely allied to M. Turneri Frogg., but dif- 

 fers distinctly by the shape of the head, the size of the eyes, 

 the shape of the ocelli and above all by the very character- 

 istic shape of the prothorax of the imago; also the soldiers 

 differ in the shape of the head and in the colour. 



The species lives in the open forest-country, where it 

 builds small nests of dark colour up to a height of 35—50 

 cm and reaching a diameter of about 45 cm (see Plate 

 6, Fig. 1). The nests are of ten deeply rooted in the 

 ground, and were probably originally started över a stump 

 in the ground. Sometimes one finds big stones built into 

 the nest, which consists of a barder clay casing with small 

 darker pieces on top, and a more brittle interiör, containing 

 the galleries. The winged insects were obtained in large 

 number at the bottom of a nest near Glen Lamington in 

 Southern Queensland not far from Christmas Creek. 



The nest, is now among the collections of the State Mu- 

 seum at Stockholm. 



51. Microcerotermes Turneri Frogg. 



To this species I refer some soldiers and workers from 

 Laura in North Queensland and from Yandina and Mt. Tam- 



