NOTES ON ORTHOPTERA IN THE SIAMESE MALAY STATES. 5) 
amonest the guests of the genus /citon. There is, of course, no 
similarity of colouring, or at any rate only a chance resemblance, be- 
tween these guests and their nearly blind hosts. The wander-ants of 
the genus Hctton have only simple ocelli, instead of compound eyes, 
the former being more imperfect organs of sight than the latter. The 
size and shape of these ocelli, however, differ in the different species. 
They are very small and flat in Keiton praedator and FE. coecum, and, 
in consequence, their mimicking guests, Meitonilla, Heitonides, and 
Mimeciton, possess no similarity of colouring. The smallest worker- 
ants of Heiton foreli have got comparatively larger and more arched 
ocelli than the two other species. On this account I am still in doubt 
whether there exists any true similarity of colouring between these 
little black workers and their guests. These guests have certainly no 
similarity of colouring with the big yellow warrior-ants. The question 
of colouring is quite a secondary one, as the structure, hair-erowths, 
and shape of the body, calculated to deceive the sense of touch, are so 
apparent. The case is quite different, however, with Metton californicum 
of North America. I was not a little astonished to see in a guest sent 
me by Father Jerome Schmitt, O.5.B., which he had discovered with 
this ant in North California, that the rust-red colour corresponded per- 
fectly with that of its host. When I looked, however, at the eyes of the 
latter through a lens the enigma was solved. They were comparatively 
well-developed, arched, and twice as big as those of the same sized 
workers of Heiton praedator. It is, therefore, apparent that Hciton 
californicum is able to see the colour of its guest, and so this element 
has been changed also by the aid of mimicry. 
(Lo be continued.) 
Notes on Orthoptera in the Siamese Malay States. 
By N. ANNANDALE, B.A. 
The following are some general notes on the habits of the 
Orthoptera made last year during the months of April to September, while 
I was a member of an expedition sent out to Lower Siam under the 
auspices of the Cambridge University and the leadership of Mr. W. 
Skeat, of Perak, and with the kindly and most generous aid of the 
Siamese Government. I hope soon to publish a more detailed account 
of some of the insects mentioned, more particularly of the flower-like 
Mantids and of certain of the Locustids. 
Karwigs are rare in those parts. A few species may be caught 
round the lamp on some evenings; on others, apparently identical as 
regards temperature and weather generally, hardly an insect of any 
kind is attracted by the flame. In the plains these fertile nights are 
commoner than they.are among the hills or in the midst of thick 
jungle. A few earwigs, mostly immature forms, may also be found 
under the bark of dead trees or in rotten timber. Sometimes a anes 
outcanoe on the riv er isinfested by them. In onecavern of the Jalor 
caves, Chelisoches morio, Fabr., abounded amone the bats’ dune on aie 
sround: and might be taken by laying a dry object, such as a camera- 
case, in the middle of the cavern. Numbers both of adults and of 
larvee would soon crawl upon it, if it were left in the dark for a few 
minutes. The cave specimens of this common species most probably 
sought the outside world in the evening, as they were only found in a 
