1881.] NATURAL SCIENCES OF PHILADELPHIA 71 



mpg, malpighian tubes. pr. th, prothorax. 



VIS, muscles. py, pygidium. 



m. th, mesothorax. px, pharynx 



met. th, metathorax. 



m. tr, metatarsus. ^^' ^^«^"°^- 



mx, maxilla. ^^- ^h rectal glands. 



mx. p, maxillary palpi. g_ ^^^ g^p^lg ^f; gizzard. 



stm, stomach. 



nd, node of petiole 

 7ik, neck. 



str, striae. 

 su, sucker. 



00^9, occiput. tib, tibia. 



^^' ocelli. i^^ tongue, 



ffi, esophagus. t,.^ tarsus. 



2). ms, pharj-ngeal muscle. V, ventral. 



EXPLANATIOX OF PLATES.^ 



Plate I. 



Fig. 2. Yiew of my camp in the Garden of the gods, showing 

 the site of some of the nests of the honey ants studied. The 

 view is taken from the rocks at the junction of Adams and Yon 

 Hagen ridges (see Fig. 1, p. 19), and looks towards the south, and 

 the eastern face of Pike's Peak. One of the nests is shown in 

 the foreground, and the sites of others are indicated by the white 

 circles on the tops of the ridges. My tent and booth are seen 

 near the centre of the sketch, and just opposite, on the right, is 

 the oak copse in which the ants were discovered feeding on the 

 exudations of galls. Page 19. 



Plate II. 



Fig. 3. Elevated gravel cone of a honey-ant nest ; the gravel is 

 of red sandstone, and the rocks around are bits of quartz of several 

 colors, giving a prett}^ effect. This nest is the largest seen, 

 and measures three and one-half inches high and thirty-two inches 

 around the base. Page 21 



^ Mr. Joseph Jeanes, a member of the Academy of Natural Sciences 

 of Philadelphia, contributed the money required for the illustration of 

 this paper, and thus has greatly added to whatever value it may possess. 



