obliterated in the course of the vicissitudes the wings were 

 subjected to during an indefinite period before I came along 

 to pick them up — further damage by other insects, scraping 

 as they were blown about by the wind or pelted by rain. 



" ISth December. — I have once again seen my yellow bird 

 with black head attack a Catopsilia, swooping out a short 

 distance from its lurking-place among a mass of Poinciana 

 flowers on the advancing butterfly, a mode of attack under 

 easy circumstances which, as I see in the Proc. Ent. Soc, 

 Pt. I, 1915, p. xxxvi, in Swynnerton's paper, had long before 

 been suggested as probable by Dr. Marshall. 



" My examination a day or two ago of the contents of the 

 alimentary canal of the bird and my further perusal of Swyn- 

 nerton's paper, or rather reply to Colonel Manders, has induced 

 me to undertake the examination of a series of birds' droppings 

 collected under my Poinciana and other trees likely to attract 

 butterflies. The results have been to me rather surprising. 

 Up to date I have examined under a low-power objective 

 thirty pellets, seventeen of which contain the scales of Lepi- 

 doptera, I believe Catopsilia. But my own knowledge of 

 insect histology is very limited, and I feel that it would be 

 better for some one having a wider experience — perhaps 

 Dr. Eltringham — to express an opinion on them, and so I have 

 put aside all pellets in which I have found the scales (308), 

 and if he is able to spare the time I am sure it will afford him 

 no little recreation to put his knowledge of the histology of 

 the fragments to the test by identifying the disjuncta membra 

 of a whole host of insects besides the butterflies, much as when 

 I was a medical student it used to be a question of pride in 

 the work to be able to recognise all sorts of odd bits of shafts, 

 tubercles and epiphyses of bones. I will examine if possible 

 exactly one hundred pellets of excreta. 



" A week or two ago I felt sure I saw a wagtail offering to a 

 young one soliciting food the body of a Calopsilia with part 

 of one wing attached ; yet I thought I might be mistaken, 

 because I have rarely seen the birds catching food above- 

 ground, though when in 1914 I fired the grass in tsetse country, 

 hoping to see if any birds took toll of the flies driven before 

 the flames, I remember the same sort of wagtails taking 



