ERIC MJÖBERG, ISOPTERA. 105 



the left one with two large, sharp apical teeth, a sharp smaller 

 one below and a sharply projecting triangulär basal portion, 

 the right one with two large apical teeth, a very broad and 

 obtuse one immediately below and a broad, not projecting 

 basal portion; antennae short, whitish, hairy, 3rd joint smal- 

 lest, joints rounded at the sides, gradually longer and longer, 

 apical joint twice as long as broad ; abdomen whitish, 

 elongate, sharply hairy. 



Measurements: Length of body 4,5 mm, length of 

 head 0,9 5 mm, breadth of head 0,8 mm, breadth of abdo- 

 men 1,24 mm. 



This species builds smaller galleries and ducts under 

 trunks and logs on the ground. Winged insects together 

 with one queen, soldiers and workers found at Colosseum, 

 Southern Queensland, in November. 



49. Microcerotermes serratus Frogg. 



To this species I refer soldiers and workers from Cook- 

 town in North Queensland. There are also some workers and 

 a soldier from Broome in North West Australia, which I pre- 

 liminary refer to the above species. — Lives under logs or 

 stumps on the ground, making temporary galleries and ducts. 



50. Microcerotermes excisus n. sp. 



Imago (Text Figs. 53 a, 56, 57). General colour dark 

 brown, under surface lighter. 



Head very dark, forehead lighter, arcuate, rounded behind 

 and at the sides, flattened on the summit; eyes large, more 

 flattened and not quite so rounded and projecting as in M. 

 Turneri Frogg.; ocelli longer and not so rounded as in M. 

 Turneri Frogg., more reniform; basal part of clypeus divided 

 by a median dark suture, light fuscous, more than twice as 

 broad as long, rounded at the sides, truncate in front, apical 

 part whitish, membranaceous, prolonged inthemiddle; labrum 

 large, rounded at the tip; jaws large, the left one with two 

 sharp apical teeth and a smaller, more obtuse one further 

 down, connected with the second apical one by a sharp edge, 

 basal part forming a rounded obtuse projecting process, the 



