MORGAN HEBARD 1 35 



cerci, evenly convex -.^is surface rather broadly convex above the cerci, strongly con- 

 cave and declivent distad in entire remaining portion. Cerci elongate and slender, 

 with lateral margins moderately crenate distad. Genital hook shorter and broader 

 than in any other species of the genus except pen sylvan ica. Subgenital plate weakly 

 con\'ex, except toward bases of styles, where it is moderately concave; lateral mar- 

 gins moderately convex in proximal portion, then rather strongly concave and con- 

 vergent to bases of styles; distal margin between styles transverse, weakly concave; 

 styles small, simple, cylindrical processes, situated disto-laterad in sockets on the 

 ventral surface of the plate, immediately at the sharply rounded disto-lateral angles, 

 each slightly less than half the distance between their bases, at the base of the dextral 

 style the dorsal surface of the plate is raised in a brief rounded knob. Exposed 

 folded ventral portion of eighth dorsal abdominal segment in length slightly less 

 than that ot exposed portion of seventh ventral abdominal segment. 



Characters of Female. — (Albany, Georgia.) Size medium, form moderately broad. 

 Head with face appreciably more deplanate than in this sex of any other species of 

 the genus. -IS Interocular space slightly less than that between antennal sockets, ^^ 

 small ocellar spots present. ^^^ Pronotum deeper than in male, with greatest width 

 near caudal margin and latero-caudal angles much more sharply rounded, sulci of 

 disk obsolete. 2^9 Tegmina (normally) decidedly reduced, broadly sublanceolate, 

 covering only about half the dorsal surface of the abdomen,^^') approximately twice 

 the length of the anal field, decreasing in breadth distad; apex, in discoidal field, 

 only moderately broadly rounded. Wings (normally) greatly reduced, extending 

 but slightly beyond apex of anal field of tegmina, with fields and remaining 

 portions of veins distinct. ^^i Sixth dorsal abdominal segment broadly and feebly 

 concave laterad, broadly but more decidedly convex mesad. Supra-anal plate with 

 lateral margins (normally) nearly straight, convergent, showing a slight concavity 



-'^ The small series of males at hand show slight but distinct differences in form of the 

 supra-anal plate. The free margin in one shows slight truncation; in another feeble 

 disto-lateral angulations of this margin are suggested, a condition approaching the form 

 normal in pensylvanica. 



-'^ This condition is decided only in the females before us from Albany, Georgia and 

 Opelika, Alabama. Those from more northern localities in the east, can not be separated 

 from females of pensylvanica by this feature. 



-'' Occasional specimens have these dimensions subequal. 



-'^ In some females of divisa the ocellar spots are very weakly defined. In pensyl- 

 vanica the ocellar spots of the female sex are normally more distinct. 



-'^ These are weakly indicated in many females at hand. 



--" In the series before us are females with abdomen drawn in, and in consccpience com- 

 pletely covered by the tegmina, others have decidedly more than half of the alwlonicn 

 exposed. 



Two females from Opelika, Alabama, show that a much greater development in the 

 organs of flight sometimes occurs. These have the tegmina and wings extending to the 

 apices of the cerci, the reduction found being chiefly limited to the distal portions. 



"1 Decided variation in the organs of flight occurs in females of divisa. The degree of 

 reduction in tegmina and wings is proportionate. See footnote 220. 



MEM. AM. ENT. SOC, 2. 



