ants' nests. ^^^ 



Fig. 13— Continued. 



B Bark of the bough of the pear tree. 



o" Opening of the nest outward, and head of a soldier of ColoUpsis trnncata 

 4^ho is guarding this opening, or, rather, who is keeping it closed with 

 his head, as with a stopper. The soldier is standing iu the egress pas- 

 sao-e, which is seen in cross section. 

 W Two workers of Colohopsis truncaia, one in the nest, the other outside, 

 ' hurrying to the entrance, where the soldier, drawing hack, will make 

 room for him for a moment. . 



Fio- 14 Cross section of the pseudo hulb of Hydnophy1>m vwntanum, received from 

 Java, through Dr. A. Frick, of Zurich. Photographed m one-third of the 

 natural size. The stalk, the leaves, and the root of the plant are also 



seen (see text). i ^ + ^« 



Fio- 15 Pasteboard nest of Dolichoderns Mfnberculatus Mayk, on the bough of a tree. 

 Received from Bangkok, Siam, from the late well-known turner, Mr 

 Sio-o- of Zurich. In order to show the interior labyrinth, a portion o 

 thTnest has been removed by a flat, perpendicular cut. Photographed 

 in one-third of the natural size. 

 Surf. Surface of the cut and inner labyrinth. 



U. s. Natural upper surface of the nest. , . , . . ^.u^ 



Br. A small branch of the main bough, cut through and inclosed in the 



nest. The uest rests upon the main bough. 



Fig. 16. Web of Folyrkackis spinigera Mavk, from Poonah ^^IJ^^^'^'^'^'^l^ 



Wroughton. Microscopic enlargement; Hart nack, System 1\. (Com- 



Fio- 17. NesrwInof%S-^i/u-3ierdon;iFoREL, from Ceylon; received from M^>r 

 Yerbury, through Mr. Wroughton. Microscopic enlargement, Hait- 

 nack. System VII. 



■pi fiinall flakes of vegetable matter. _ . 



Web Lpun net of t^e ants, by means of which these flakes are ,oined 



Fi^- IS ApilTotthrnirpasteboard of DoUvhoderus MspiuosusOi^iy from tropical 

 ^ ' America; received through Professor Emery. Microscopic enhu-gement, 



Hartnack, System IV. , ^ ^ i ,,.,i ^ 



Fib. Vegetable fibers (of Bomhax ceiba L.) of .vhich the nest pasteboaiu is 



Cem'Tnrclent, or lac, by which the vegetable fibers are glued together 



or fastened (of a In-ight yellowish or brownish color). 

 Mesh. Empty meshes left by the nest walls between them. 



"t B^iu S^^^icept fig. 8, were drawn or photographed (figs^l4and 15) 



,N. u. ^vii V. a , m^<,f>U' drew onlv fig. H and the ants in fig. 10. 



from nature by Mr. L Schrotei. ^^-/^^ ^^ ^ ^d 18 are in my collection; those 

 of :^;'r;;:.,iri3';;;;n\'hr;ntom'ologic;i collection of the Museum of the 

 Federal Polytechnikum (my former collection of European ants nests). 



