bat 
=~] 
TWENTY-FIRST ANNUAL REPORT i 
PART II, BY G. INNESS HARTLEY. 
XIX—Notes on the Development of the Jacana. 
X X—Notes on the Development of the Ani. 
X XI—Notes on a Few Embryos. 
X XII—Nesting Habits of the Grey-breasted Martin. 
X XIII—Development of the Wing in Birds. 
XXIV—Notes on the Perai. 
PART III, BY PAUL G. HOWES. 
XXV—tThe Bees and Wasps of Bartica. 
XX VI—Two Potter Wasps. 
XX VII—Larval Sacrifice. 
XXVIII—The Black Reed Wasp. 
XXIX—The White-footed Wasp. 
XXX—The Forest Shell Wasp. 
XX XI—The One-banded Dauber. 
XX XII—The Blue Huntress. 
XX XIII—Paralyzed Provender. 
XX XIV—Controlled Pupation. 
The richness of the small area of jungle in which we worked 
in the vicinity of Bartica is attested by the fact that there occur 
within its limits at least three hundred and fifty-one species of 
birds; quite 45 per cent. of the whole number recorded from the 
entire Colony. We made notes on more than fifty species of 
mammals, including all the more representative groups of South 
America. These will be elaborated, added to and published at 
the end of the ensuing year. A single Akawai Indian hunter 
kept us supplied with excellent meat for many months from the 
jungle immediately about the Station. Yet, at the end of our 
stay, there seemed no diminution in the number of game birds 
and animals, even a short distance away. 
Attention is particularly called to the many discoveries, 
such as the eggs and young of toucans, the nestlings of various 
birds such as the trumpeters, the photographing for the first 
time of the quadrumanal habits of the hoatzin, and the no in- 
considerable number of nests and eggs new to science. This 
was all incidental, as the collecting of specimens is in no way a 
primary object of the Station’s work. Subjects of special study 
were the tropical seasons and their effects on the broods of birds; 
