2S E. B. WlLUAMSON 



is the only case I have seen in all the wings studied in which a main sector 

 is so switched. The appendages of the single female are broken. 



Material examined: Peru, Campamiento, Colonia del Perene (W. T. M. 

 Forbes, June 12, 1920, i female, Cornell) ; Bolivia, near Coroico, Yungas 

 (W. J. Gerhard, May 2, 4, and 12, 1899, 3 males, A. N. S.) ; Brasil, Minas 

 Geraes (Rolle, 1914, i male, Ris). See also discussion above of specimens 

 in the de Selys Collection. 



Navas (29) describes a male from Sao Paulo as a new species, G. niar- 

 lini. His figures of appendages indicate that the inferior is relatively slight- 

 ly longer than in specimens of adela seen by me, but definite characters for 

 separating the two species are not evident and it is probable iiiartiiii is a 

 .synonym of adela. 



Gynacantha convergcns Forster 

 15, 17, 26, 35. 



Abdomen male 42, female 44-45; hind wing male 38, female 41-41. 5; 

 superior appendage male 4.8; stigma front wing 3.3. 



I follow Dr. Ris's determination of this species. The margins of the 

 genital fossa of the second abdominal segment of the male are without 

 teeth or denticles. The auricles are each armed with' five to seven denticles, 

 of which the two or three most anterior ones are very small. Between 

 M, and Rs in the front wing there is one double cell in two male wings and 

 one female wing, two-three double cells in one female wing, three double 

 cells in one female wing, and four double cells in one female wing ; in tho, 

 hind wing there are no double cells in two male wings, one double cell in 

 two female wings, one-two double cells in one female wing, and two-three 

 double cells in one female wing. Appendages of both females broken. 



Material examined : Bolivia, Province del Sara, Dept. Santa Cruz, 

 450 m (Jose Steinbach, 1918, i female. Ace. 6443, Carn. Mus.) ; Argentina, 

 Yuto. Jujuy 450 m (P. Joergensen, April, 191 1, i male, i female, Ris). 



Navas (32) describes a single female from Italiba, Brazil, as Gynacantha 

 limai. From the very nature of the case positive identification is impossible, 

 but I believe Vnnai will prove to be a synonym of conx'crgcns. 



Gynacantlia tenuis ^lartin 



25, 26. 



Abdomen male 38.5-44, female 41-47; hind wing male 39-41.5, female 

 38-46 ; superior appendage male 4.2-4.4, female 3.2-3.6 ; stigma front wing 



3-2-34- 



Specimens in the M. C. Z. labelled tennis by Hagen make the determina- 

 tion of this species certain. In Martin's description (25) his figure 178 

 is certainly tennis. In the last paragraph of his text he says "L'aile de I'in- 

 dividu figure porte exceptionnellement deux rangs de cellules sous la boucle 

 anale." Presumably this remark applies to the specimen of which the 

 appendages are figured, figure 179. It is doubtful if figure 179 is really 

 tenuis as it does not agree well and really'much more resembles anricularis. 



