1914.] NATURAL SCIENCES OF PHILADELPHIA. 315 



into the cones, again indicating that the sense cells are modified 

 hypodermal cells and that the hypodermis forms the cones about the 

 time when the other chitin is completed. Hair-mother cells (HrMS) 

 forming the hairs are also common. Figure 15 is a pore from group 

 No. 6 and figure 16 is an isolated pore from group b on the trochanter. 



Sections through the trochanters of adult dealated females of 

 C. pennsylvaniciis and through the front wings of adult females and 

 males of C. mela were made. The pores (figs. 17 to 22) found in these 

 sections are like those already described for the females of Formica. 



To ascertain if the nerves running to the wings and the sense cells 

 in the stubs of the wings of old dealated female ants are present, the 

 thorax of a dealated female of Camponotus was cut transversely into 

 sections 25 microns thick. This female had been kept in captivity 

 eight months and had reared a small family. On account of the 

 broken conditions of the sections, nerves cannot be traced into the 

 stubs of the wings, but the thoracic ganglia give off branches, and 

 some of these run toward the bases of the wings. Pores and sense 

 cells are easily found in the stubs of the wings. The sense cells 

 appear to be normal in all respects. Figure 23, SC, represents a few 

 of them taken from one wing. It thus seems that the nerves and 

 sense cells do not degenerate, as do most of the muscles in the thorax 

 of a dealated female ant, but the organs in the bases of the wings 

 appear to function throughout the life of the ant. 



Text fig. 3 is a diagram representing a transverse-longitudinal view 

 of a small portion of the femur {¥) and about two-thirds of the 

 trochanter {Tr) from the third leg of a female of Formica. Groups 

 Nos. 7, 8, 9, and h are shown as marked by these characters. The 

 anatomy of the leg and the innervation of these groups are also shown. 

 At this articulation the nerve {N) runs near the centre of the leg and 

 nerve branches {NB) are given off which run to the groups of sense 

 cells {SC). The sense cells are so located that the muscles {M) are 

 not near them, and a trachea runs near each group of sense cells. 



Plate XI, fig. 25, and Plate XII, fig. 26, are semidiagrams repre- 

 senting the innervation of the groups of pores (marked 2, 3, 4, and 5) 

 as found in the wings of Formica. Each wing arises from a niche 

 {Nic) in the thorax. The hard chitin of the wing is represented by 

 solid black, the soft articular chitin of the wing by dots, and the hard 

 chitin of the thorax by broken lines. 



Sections through the wings and legs of pupae of the hornet (Vespula 

 maculata) and the muddobber (Sceliphron cementarius) were also 

 made. The pores of the hornet (figs. 27 to 32) are the largest ones 



