MORGAN HEBARD 89 



NORTH AMERICAN ACRIDIDAE (ORTHOPTERA) 



PAPERS 1 AND 2 

 BY MORGAN HEBARD 



PAPER ONE 



A Study of the Group Achuri, as Found in the 

 United States 



The Achuri, here separated for the first time, come first among 

 the North American groups in the Subfamily AcricHnae ( = 

 Truxahnae of authors). As our field work has resulted in the 

 assembling of material of all the forms found in the United 

 States, we have decided to present the results of the study of the 

 series now available. 



No affinity with the Group Hyalopteryges exists, the nearest 

 relationship apparently being with the Old World Group Odon- 

 tomeli. In the linear arrangement of the North American 

 Acridinae, Achurum and Radinotatum come first, then Pscudo- 

 yomala and Mermiria of the Group Mermiriae, followed by 

 Truxalis, a true Hyalopterygine genus. 



Comparison has been made with material of the other Hyal- 

 opterygine genera Hyolopteryx, Eutnjxalis and Paratruxalis, as 

 well as several genera of the Group Odontomeli in the Phila- 

 delphia Collections. 



The Achuri are distinguished by the very slender, elongate 

 form; the produced, horizontal head, with vertex laterally and 

 medio-longitudinally carinate; the weakly defined lateral or 

 ventro-lateral foveolae; the ensiform antennae; the long pro- 

 notum with disk flattened, lateral and medio-longitudinal 

 carinae parallel and straight and the very shallow lateral lobes; 

 . die slender, acuminate tegmina and wings (when fully devel- 

 oped), the latter with no fenestrate area in either sex; the pro- 

 sternum with cephalic portion slightly convex; the very slender 

 caudal femora with dorsal and ventral genicular angles produced, 

 and the conical (strongly to greatly) i)rodu('('(l male subgenital 

 plate. 



TRANS. AM. ENT. SOC, XLVIII. 



