MORGAN HEBARD 347 



and Zehntner have described conformis from a single female, the 

 onh- feature of distinction there given from consohrina (synonym 

 of rufa occidentalis) , being the distinctly more triangular form 

 of the supra-anal plate. The material before us shows this fea- 

 ture to be surprisingly variable in the present species, occasional 

 examples showing even greater differences in this respect, and 

 conformis consequently falls as an absolute synonym of the pres- 

 ent race. 



Rehn's record of /. rufa from Misiones, Argentina, applies to 

 an exceptionally pale specimen of /. vilis. 



The present species divides into three geographic races: typi- 

 cal rufa is found throughout the West Indies (excepting Cuba) 

 and on the continent from Nicaragua southward to British 

 Guiana; rufa debilis occurs in the higher country of Costa Rica, 

 while rufa occidentalis occurs from Nicaragua northward as far 

 as New Orleans, Louisiana. ^^ 



The race rufa dehilis represents an extremely depauperate con- 

 dition, with tegmina and wings decidedly reduced in both sexes 

 and other structural modifications. The production of the male 

 subgenital plate is decidedly more conspicuous and abrupt in 

 rufa occidentalis than in rufa rufa. 



From /. morio this insect differs in its smaller size and reddish 

 coloration, the male supra-anal plate is distinctive but the sub- 

 genital plate, though different, shows a development similar in 

 many respects. 



Characters of cf •— (Old Panama, Panama.) Size medium large; form mod- 

 erately stout, not as slender as in morio. Head with interocular and intero- 

 cellar spaces subequal in width. Ocelli distinct, flattened surfaces of ocellar 

 areas slanting rather strongly mesad. Maxillary palpi rather short. Tegmina 

 in general much as in morio, but not as elongate and with portion of dextral 

 tegmen, concealed when at rest, not as strikingly transparent. 'Wings c-olor- 

 le.^s hyaline, except area of costal veins which is moderately embrowned, 

 this suffusion also present to a lesser degree in the distal portion of the 

 anterior field, veins brown. Supra-anal plate produced, with lateral margins 

 weakly convergent and rounding sharply into the broad transverse distal 

 margin, which is nearly as wide as the length of the plate; surface convex, 

 except mesad where it is weakly concave, this strongest in a large, 

 distinct, subchitinous, transverse oval area just proximad of the distal 

 margin; ventral surface thickly covered with short stout bristles distad 



" The records of this species from north of the state of \'era Cruz, Mexico, 

 are based, we believe, on introduced material. 



TRANS. AM. ENT. SOC, XLII. 



