1910 



Burrill, Hoic Sanguinary Ants Changs Direction. 



129 



wet in the shade of the house and of hushes. They had traveled 

 quickly and seemed laying- out a route after the rain ; but in the 

 damp shaded grass (Fig. 2, b),— where a dying maple dropped 

 many leaves, now curled and filled with rain water pools, like pit- 

 falls or wells to the sanguinary ants,— the squad became confused, 

 draggled, scattered, and aimless by 2:15 p m., having previously 

 traveled about 8 m. ( 25') in 20 minutes. Not foreseeing that any- 

 thing more important would happen, I left them and missed seeing 

 how they got out of their predicament. If they had continued 



Street 



RED'S WEST 



BLACK'S NEST 



o- 



in 



Flower Bed 



House 



Fio-. 2. Example of Trail with subsequent Curve adopted for appar- 

 ently greater Ease of travel. Sketch based on scale of about 17.9' : 1" 

 or 2.148 111. : 1 cm. as now reduced. Reds— F. sanguinea r.V siihin- 

 tegra. Blacks — /•'. fusca X snbscricea. 



straight on their course through the wet grass, they would again 

 have crossed the smooth tar walk, the latter being in the shape 

 of a half circle (Fig. 2, a). I was surprised, then, at 4 p. m., to 

 find a large train of soldiers not taking- this chord (b) of an arc 

 (the curved tar walk a.) but following around the edge of the 

 dried-off tar itself, all the way round to the point where they 

 would have emerged by continuing on the chord (b). At this 

 point, the line of march turned as if in continuation of the line of 

 the chord, passing through thinner grass, over a board walk, and 



