JAMES A. G. REHN AND MORGAN HEBARD 



273 



-septentrionalis 



■pistillata 



-curvicauda borealis 



— curvicauda curvicauda 



curvicauda laticauda 



slrigata 



■ hemidactyla 



-texensis 



-furcatafurcala 



fur cat a furcifera 



■paronae 



-ungulata 



mexicana 



-cuneata 



In some respects members of the different groups show a cer- 

 tain similarity to each other. Thus septentrionalis and pistillata 

 both have coriaceous tegmina with heavier veinlets; all of the 

 other species have the tegmma glossy, this being particularly 

 marked in hemidactyla, due partially to the tegminal veinlets being 

 reduced in this species to the minimum size fomid in the genus. 

 A broadly and evenly arcuate ovipositor is fomid in septentrionalis, 

 hemidactyla and imgulata, and the greatest bend in that organ is 

 found in the most highly specialized species, texensis, strigata and 

 mexicana. The male supra-anal plate is not strongly produced 

 and compressed in septentrionalis and hemidactyla only. The 

 tegmina are verj'' broad in pistillata, broad in curvicauda and its 

 races, septentrionalis and ungulata, and narrow to varj'ing degrees 

 in the other species, this attenuation decided in texensis and mexi- 

 cana but reaching an extreme condition in strigata. 



The species of the present genus have the genicular lobes of all 

 the femora bispinose; the ventro-cephalic margins of the cephalic 

 femora often bear a veiy few small spines or denticulations, the 

 ventro-caudal margins of the same one or two, but these are fre- 



TRANS. AM. ENT. SOC, XL. 



