70 



The A eric ol oils Stratum. — The air is an important animal habi- 

 tat. It provides a medium for rapid locomotion and a temporary 

 means of escape from enemies, A great many animals fly about in 

 search of food, descending when it is located, and a number of pre- 

 daceous forms take their food on the wing. The aerial stratum is 

 used by phytophagous animals during many of their ordinary activi- 

 ties, but not in feeding, of course. In the present discussion, it has 

 been found inexpedient to separate plant-eating animals which fly 

 about much of the time, as Danais plcxippiis, from other plant-fre- 

 quenting forms which are not such strong fliers, or which may not 

 fly at all. All of these animals are placed in the herbicolous group, 

 since, to avoid complication, the animals have been placed in the 

 habitat in which they feed. It is to be remembered, however, that 

 during other activities the plant-feeding animals are well represented 

 in the aerial stratum. 



Herbicolous Noii-selective Plant-eaters. — Animals of this group 

 eat herbage of almost any kind, not being restricted to particular 

 plant species. They are thus preeminently eaters of grass. 



Non-selective plant-feeders* 



^Mermiria bivitiata 

 Merniiria neo m cxicana 

 Britettix sp. 

 Aniphitornus bicolor 

 Cauipylacantha olivacca 



*Melanoplus angustifetniis 

 Scudderia texensis 

 Conocephaliis robustus 



* Tettigia hieroglyphica 

 Scolops grossus 

 Agallia sang uinolen ta 

 Typhlocyba comes 



*Apludidae 



*Coccidae 

 Adelphocoris rapidus 

 Lygus pratensis 

 Ligyrocoris diffusus 

 Lygaeiis kalmii 

 Buschistus variolarius 



*Pc)itatoina pcrsiinilis 



Peribalus liuibolarius 

 ^Lachnostcrna prunina 



LacJuwsterna micans 



Lachnosterna implicit a 



Polyphylla hammondi 



Anoinala lucicola 



Colligrapha similis 



Diabrotica longicornis 



O edio nychis gibbitarsa 



DisonycJia triangularis 



Rhynchophora 



Apantcsis sp., larvje 



Diacrisia I'irginica, larvns 



Noctua c-nigruui, larvne 

 *Feltia subgothica, larv.T 



Leucania phragmitidicola, larv?e 



Crambus sp., larva? 



*Tn the lists of animals of the various associations, an asterisk denotes that 

 the species is a dominant form. 



