112 Claude Fuller 



Nasuti and Workers: — I am not able to point to any critical 

 differences between these castes of ir'merviformis, havilandi and 

 kurumanemh. One may only say that as between large reproduc- 

 tive nests the nasuti of irinerviformis are upon the whole larger than 

 those of havilandi. 



It very often happens that in a nest series of irinerviformis the 

 intermediate and major nasuti so intergrade that they cannot be 

 definitely separated, unless those with joint III. almost twice as 

 long as II (11:6) are assumed to be majors and those in which 

 this joint is a little longer than II., intermediates. I may add 

 that for the different nest series one never gets exactly the same 

 range of measurements nor any complete agreement as regards 

 the three dimensions as the following example well illustrates: — 

 Head width 25 25 25 26 



Head length 42 43 46 43 



Head height 17 19 18 17 



If insects from small nests are also considered the range of 

 the different dimensions is extraordinary. I select one dimension, 

 the head length, to illustrate this. For thirty one nests at Pieter- 

 maritzburg, from 4. 75 inches to 3 feet in diameter, this was found 

 to vary all the way from 1.94 to 2.79 for the major-intermediate 

 nasuti of the communities. 



The following are the ranges and averages for nine major- 

 intermediate and 12 minor nasuti taken at random from two 

 reproductive nests. 



Major: Head, width 1.30 to 1.60 (av. 1.48) ; length 2.40 to 

 2.79 (av. 2.51); height 0.98 to 1.25 (av. 1.08). 



Minor: Head, width 0.79 to 0.98 (av. 0.90) ; length 1.85 to 

 2.04 (av. 1.94); height 0.63 to 0.80 (av. 0.67). 



Whilst this shows a higher range than that ascertained for 

 havilandi the averages are not outside the havilandi range. 



The insects upon which the specific criteria are based are repre- 

 sentatives of nest series collected by the writer at Pietermaritzbure:, 

 Durban, Illovo Lagoon and Dumisa or the same terrain as that 

 of Holmgren's species trinervifortrAs, auriceps bulbiceps and 

 duhius. There is no question in my mind as to the correctness of 

 the synonymy set out, but there remains a possibility that the in- 



