REHN AND HEBARD 37 



A REVISION OF THE ORTHOPTEROUS GROUP 

 INSARAE (TETTIGONIIDAE, PHANEROPTERINAE) 



BY JAMES A. G. REHN AND MORGAN HEBARD 



Recent extensive collections made in the southwestern United 

 States by the authors have afforded so much material of this little 

 known group, that it has been deemed advisable to study all of the 

 forms and the results of this work are presented in the present 

 paper. 



The group Insarae (Hormiliae of Authors) belongs to the family 

 Tettigoniidae and the subfamily Phaneropterinae, in Brunner's 

 classification being preceded by the Tylopsiae and followed by the 

 Scudderiae. 



The Insarae are distinguished by the tympanum of the cephalic 

 tibiae being open on both sides, while the limbs are long and slender 

 and the femora have the genicular lobes more or less decidedly 

 produced. The pronotum has the lateral lobes either angularly 

 or roundly inserted, in which latter case it is more or less decidedly 

 sellate. The subgenital plate of the males bears two disto-lateral 

 processes, which in different species are mere tubercles or rather 

 long processes, constituting non-articulate styliform appendages or 

 articulate styles. The ovipositor is short, strongly compressed 

 and more or less decidedly arcuate or bent-arcuate, with dorsal 

 and ventral margins serrate or serrulate distad and having the 

 distal portion of the disk also more or less armed or roughened. 

 No apterous species are known and there is but one species having 

 the tegmina aborted and the wings concealed in the male sex. Cer- 

 tain species are strongly dimorphic in wing length. 



The rimate tympanum of the cephalic tibiae readily separates 

 the Tylopsiae from the present group. 



The Scudderiae differ in having the male subgenital plate very 

 long and attenuate, curved dorsad with the caudal margin emargin- 

 ate or fissate (excepting in some species of Sijmmetro pleura). The 

 American species of the genus Symmetropleura are in fact in some 

 respects intermediate between the two groups, agreeing with the 

 Scudderiae in the general facies, more ample pronotum, shorter 

 limbs and more delicate tegminal venation; the subgenital plate_and- 



TRANS. AM. ENT. SOC, XL. 



(4) ^^^^'"' 



1914 



Wuse}^ 



