ECONOMY OF THE ICHNEUMONID MONOBLASTUS PALUSTRIS. 89 



By the morning of the next day there was some more develop- 

 ment in outline towards pupation, which then took place. In 

 the evening it had got clear of the black fluid. 



Beyond a darkening of the eyes and ocelli there was no 

 visible change until August 10th, when there was a slight 

 clouding of the cheeks and whole thorax, of which the meso- 

 thorax and mesosternum were nearly black, as were two marks 

 down the metanotum, and the mandibles red at the tips. 



On the evening of August 11th the head, thorax, and coxsb 

 were quite black, a black patch on the dorsal area of the two first 

 abdominal segments, next two clear except two dots on each 



1. Monoblastus i}alustris,lUgr., J. 2. Face. 



ventrally, the rest clouded and marked with black only on the 

 ventral surface (not clouded), with the legs commencing to show 

 colour. 



The next morning, August 12th, I found that during the 

 night there had been a considerable darkening of colour all 

 round, the dorsal surface of the third and fourth abdominal 

 segments now being orange, legs more red, antenna clouding, 

 and mandibles darker. 



The following evening, August 13th, there was an exudation 

 of moisture and the pupal skin cast, except from the extreme 

 anal end. By the evening of August 14th this was discarded 

 altogether, and some whitish pellets of exuvia) exserted, and in 

 the morning, August 15th, the imago, a male, was running 

 round the tube ready to emerge. 



Though the economy of this species, as far as investigated, 

 does not present any phenomena of more than usual interest, it 

 is rarely that any glimpse of what takes place during the early 



