THE CANADIAN ENTOMOLOGIST. 133 



the fourth I have seen but a single ant and in one instance. I have 

 watched and experimented in various ways on both larvae and 

 ants, shifting either from one stem to another, fresh larvae to ants 

 and ants to larvae. The ants, when discovered on a stem, will invariably 

 be on or near the larva. They run over the body, caressing with 

 antennae, plainly with the object of persuading the larva to emit 

 a drop of the fluid on i-i. Most of this caressing is done about 

 the anterior segments, and while the ants are so employed, or rather, 

 while they are absent from the last segments, the tubes of 12 are 

 almost certainly expanded to full extent, and so remain, with no retracting 

 or throbbing, until the ants come tumbling along in great excitement, and 

 put either foot or antenna directly on or close by the tubes, when these 

 are instantly withdrawn. The ants pay no heed to the tubes, do not put 

 their mouths to them, or to the openings from which they spring, nor do 

 they manipulate that segment. They seek for nothing and expect nothing 

 from it. But they do at once turn to 11, caress the back of the segment, 

 put their mouths to the opening, and exhibit an eager desire and 

 expectancy. By holding the glass steadily on 1 1, a movement of the back 

 of this segment will soon be apparent, and suddenly there protrudes a 

 dull green, fleshy, mamilloid organ, from the top of which comes a tiny 

 drop of clear green fluid. This the ants drink greedily, two or three of 

 them perhaps standing about it, and they lick off the last trace of it, stroking 

 the segment meantime. As the drop disappears this organ sinks 

 in at the apex and is so withdrawn. The ants then run about, some 

 seeking other larva? on the same stem, some with no definite object, but 

 presently all return, and the caressings go on as before. The 

 intervals between the appearance of the globule varied with the condition 

 of the larva. If exhausted by the long continued solicitings, some 

 minutes would elapse, and the tubes meanwhile remained concealed ; but 

 a fresh larva required little or no urging, and one globule followed another 

 rapidly, sometimes even without a retracting of the organ. I have counted 

 six emissions in seventy-five seconds. The larva did not always await the 

 approach to the 1 ith segment, but gave out the drop unsought and as 

 soon as it was aware of the presence of the ant. Now and then the drop 

 was preceded by a bubble several times larger than itself. 



As I have stated, the tubes are usually expanded when the ants are 

 absent from the last segments, and are certainly retracted when they come 

 near. I counted the length of these periods of expansion, 10, 20, 50, and 



