14 



numbers as to become local pests. Each of these will be 

 described more or less fullv in connection with its name in 

 the proper place. 



The two papers on Argentine Orthoptera by Dr. E. 

 Giglio-Tos of Torin, Italy, have been of much value in form- 

 ing a basis upon which to build. The drawings for the 

 illustrations used here were made by Miss Edna L. Hyatt, 

 Artist for several of the departments in the University of 

 Nebraska. 



The following table for the separation of the principal 

 groups of subfamilies of locusts along with such as follow 

 will aid the reader in obtaining the names of any of these in- 

 sects mentioned here and that may come under his observa- 

 tion. 



TABLE FOK DETERMINING THE SUB-FAMILIES OF ARGENTINA 



LOCUSTS. 



A. Claws of feet without cushion or arolium between them: pronotum 

 extendintj over the abdomen; tegmina or front wings h)l)iform. 



TETTIGIN^E. 

 AA. Chiws with cushion or arolium present; not extending over the 

 abdomen, 

 b. Antenna' or feelers shorter than the front femora or thighs. 



c. Head short, compressed in front. UMASTACINiE. 



ce. Head greatlv elongiited, bodv apterous or subai)terous. 



PKOSCOPIXiE. 

 bb. Antenna' longer than the front femora. 



e. Posternum or breast between base of front pair of legs smooth, 

 not provided witli a tubercle, swelling, or spine 

 d. Fastigium of the vertex but little declivious, meeting the face 

 in a more or less wcli-detined angle, the face usually very 

 obliciue. Wings as a rale without a dusky band. 



TKYXALINyE. 

 dd. Fastigium of the vertex rounded at its point of junction 

 with face, the latter vertical or nearly .so. Wings when 

 present usuallv with coloretl disk and well defined dusky 

 band . 1 :i> IPO 1 ) 1 N .K. 



cc. Posternumor breast between base of front pair of legs laniinately 

 elevated in front, tubercnlate or spined. 

 d. F'oveohe of the vertex above, contiguous, forming the apex of 

 the fastigium (Fig. 15). Rather clumsy insects, usually with- 

 out, or with abbreviated wings, but occasionallv with these 

 appendages complete. PYRGO^KNiPH I N.^j] 



dd. Foveohe of the vertex lateral, never forming the ajjcx of the 

 vertex, often closed behind or entirely w.uitiiig. I'rostcr- 

 num distinctlv spined or tubercnlate. Winu- varion-lv 

 formed. ACHIDI IN /fri. 



