94 Annals Entomological Society of America [Vol. XIII, 



Type of the subgenus Gypona (Ponana) scarlatina Fitch. 



This genus indudes a larger number of the blunt headed 

 members of the old genus Gypona. The depressed vertex and 

 the thickened margin between vertex and front will at once 

 separate these forms. 



Key to the Species of Ponana. 



A. Vertex moderately long and narrow. Species frequently sprinkled with 

 sanguineous. 

 B. Elytra unmarked or with few markings in areoles and those mostly 



transverse 1 . scarlatina Fh. 



BB. Elytra with numerous markings in the areoles either dots or lines 

 parallel with the nervures. 

 C. Elytral nervures margined with fine dots. 



D. Small species with head short 2. curiata Gib. 



DD. Species long and narrow, with larger head. .3. dohrni Stal. 

 CC. Elytral nervures not margined with dots. 



E. Fuscous dots numerous 4. sanginolenta Spgb. 



EE. Sanguineous markings only 5. irrorata Spgb. 



.AA. Vertex broad and short ocelli well before the middle. 



F. Nervures light margined with brown ocelli 

 definitely back of margin. Pronotum brown 

 with numerous spots on anterior margin. 



6. marginifrons Fowl. 



FF. Nervures brown, without margins. Ocelli 



against the rounding margin. Pronotal spots 



only behind eyes 7. resima Fowl. 



1. Gypona (Ponana) scarlatina Fitch. 



This species which Fitch described briefly but accurately in 

 1851 is one of the most variable of the North American forms, 

 both in color and markings. It varies from almost black to 

 a very light green through shades of olive, brown and scarlet 

 and with equal variation in spots and marks in such numerous 

 patterns that it has been described at least 21 times. 



Through all this variation it is a moderate sized active 

 species with a rounding vertex, longer in the middle than against 

 the eye, a definite margin except in the pale forms. The ocelli 

 are before the middle and considerably farther from each other 

 than from the eye. The female segment is very slightly pro- 

 duced and scarcely sinuated. While the male valve is very 

 large, rounding posteriorly with a definite medial callosity back 

 of the margin and often a median carina. The plates are long, 

 separate, curved somewhat like corn husks. They extend at an 

 angle from the pygofers and thus open to view two caliper-like 

 hooks. This and the large ivory posterior lobe of the scutellum 

 are the two most constant characters in the species. The dark 

 markings when present in the elytral areoles are unique in 



