134 Mr. C. 0. Waterhouse on 



They are placed quite irregularly as to position and 



direction, sometimes in groups, sometimes isolated. 

 (Fig. 1.) 



Fig. 1. 



Although the Eastern Trigone are numerous and we 

 have a fair number in the British Museum, all the 

 specimens are workers, and only workers appear to have 

 been described. I was very glad to find some males in 

 the nest described. 



Trigona collina, .t . 



The male so closely resembles the worker that it might 

 easily escape observation. The antennae are a trifle longer, 

 and more slender, with the second joint of the flagellum 

 very short and strongly transverse. The face is relatively 

 narrower ; the clypeus with its limits ill-detined, and with 

 only the front margin obscure ferruginous. The posterior 

 tibise are nearly of the same form as in the worker, but 

 the metatarsus, instead of being very broad and inclined 

 to be triangular, is parallel and as long as the following 

 joints of the tarsus taken together. The abdomen instead 

 of being obtusely acuminate and pubescent at the apex, 

 is almost truncate and beset with long, stiff, black hairs. 

 On the under -side it is longitudinally concave, and 

 generally more or less testaceous. The genitalia are 

 nearly always more or less visible. 



The entrance to the nest of T. coUina is by means of a 

 long resinous tube, that stands out from the trunk of the 

 tree. The only complete one which has reached me and 

 which was exhibited at this Society in March 1900, is 

 14 inches in length, with a somewhat spoon-shaped 

 prolongation at the entrance. 



