353 
Appendix. 
stage ; the abdominal segments are all much about the same size, 
but the last two are smaller. The lateral bristles are simple and 
there are small dorsal feather-tufts on the posterior portions of 
the segments. The mouth parts are said by Professor Howard 
to be quite different to those of Calex. The jaws are shapely, 
toothed and very long. 
The pupal stage was found by Professor Howard to last from 
four to five days. The pupa has the two siphons with slightly 
oblique openings, more like Anopheles than Calex, judging from 
Howard’s figure (fig. 41, g). The larvae were found in small 
depressions in the bed of a small stream and similar hollows in 
certain small ponds, all of which were dry a greater part of the 
summer. 
Notes on the larva of A. argyrotarsis, sub. sp. Albipes. 
Dr. Grabham sends the following note on the external appear¬ 
ance of the larva of this Anopheles :—“The majority present 
quite a different type of ornamentation, being marked on the 
thorax with a Y-shaped silvery mark and two silvery semicircular 
marks on each side of the second and fifth abdominal segments. 
These marks may be present in any order. In some only the 
thoracic one is present, in others either one or both abdominal 
marks, alone or with the thoracic. They vary greatly in brilliancy 
and are sometimes only visible with difficulty. Occasionally they 
are absent altogether.” 
SOME ADDITIONAL GENERAL NOTES AND 
FURTHER LOCALITIES. 
Absence of Anopheles in Seychelles and Barbados. 
Two notes have been sent regarding absence of Anopheles and 
malaria in Seychelles and Barbados. 
(i.) “ I have so far not been able to catch a single specimen 
of the Anopheles, and in the presence of the investigation of 
Dr. Ross it is to the absence of this insect that I consider the 
immunity of this island from malarial fever is due. 
“ I know that cases of filarial disease occur from time to time 
in Seychelles, but I do not happen to have a case under observa¬ 
tion just now. I am unable to state to which of the species 
VOL. II. 2 A 
