HANCOCK 7 



The genus Micronotus, Hanc, is a West Indian type which 

 might easily be taken for a Tettix or Neotcttix were it not for 

 the filamentous elongate character of the antennae. It will 

 probably prove upon further study that the genus Apotettix, 

 Hanc, has a more extensive range. 



TEMPERATE FORMS COMPARED. 



The species of temperate North America are, generally 

 speaking, simpler in structure than those of the subtropical or 

 purely tropical regions. In the latter regions their bodies are 

 more extremely modified in structure, the pronotum being 

 particularly specialized owing to the prominent part it plays 

 in covering and protecting the body. The body of Tettigids 

 sometimes takes on grotesque forms; for instance, the pro- 

 notum may be strongly compressed or foliaceous, as evidenced 

 in Clioriphyllum, or the median carina may be cristate as in 

 Nomotcttix, the pronotum depressed as in Paratettix, elongate 

 as in Allotcttix, tumid as in Paxilla. These suggest the possi- 

 bilities of modification of structure. The correlation of parts 

 offers one of the most interesting points of view from which 

 to study these insects. 



The relative frequency of certain long wing forms as com- 

 pared with their near congeners, the short-wing forms, is well 

 illustrated in temperate latitudes by the species Paratettix 

 CHCiilatus, Morse. In the northeastern parts of the United 

 States especially the brachypterous forms are exceedingly 

 rare. The same agency is at work in the case of Tettix 

 gramdatus, Scudd., in which the short-wing forms are quite 

 rare. On the other hand, Tettix o. triangularis, Morse, and 

 its macropterous prototype, oriiatiis, Harr. , are in some situ- 

 ations equally common. 



Many species of Tettigidae are dimorphic, some more or less 

 polymorphic as well as polyornate, showing a remarkable 

 plasticity. It was this knowledge of the great variety of 

 structure that led Professor Bolivar to speak of them as pro- 

 teiform. It will be observed that some genera are rich in 

 closely allied species and by properly directed interbreeding the 



