Tkiacaxtiiacvxa and CiVXAcantha 27 



pattern of dark and jiale in the dried material ; median transverse carina, 

 Mibapical transverse carina, and extreme apex of 2-7, and to a lesser extent 

 of 8 distinctly black ringed; 8-10 and appendages brown, slightly darker 

 fhan the segments basal to them. Margins of genital fossa of 2 without 

 teeth or spines; auricles small, armed with five to seven denticles. 



Wings hyaline ; costa, venation and stigma brown or yellowish brown 

 to nearly black ; the stigma in the females is lighter yellowish, due probably 

 to immaturity, and the posterior vein, especially, is conspicuously black. In 

 the two males and two females, of all the wings, there is, in each wing, a 

 single row of cells throughout between M„ and Rs ; in all the wings the loop 

 in M4 is greatly reduced and in the wings of the two males and one of the 

 females there is, in each wing, a single row of cells throughout between M;. 

 and M^ ; in the other female in each front wing there is one double cell and 

 in each hind wing there are three to five double cells. 



Legs pale dull yellow, unmarked, the first femora slightly darker above. 



The two females show a marked difference in size of all parts but I 

 cannot separate them on any other character. 



Material examined: Brazil, Minas Geraes (I. Rolle. 1914, 2 males, 2 

 females, Ris), type male and allotype female of this material. I am able 

 to describe this species through the kindness of Dr. Ris who loaned me the 

 four specimens I have seen, and who expressed the opinion, when the speci- 

 mens were sent to me, that they represented an undescribed species. 



Gynacantha chclifcra ^McLachlan 

 25, 26, 27. 



Gynacantha (Selysiophlcbia) aratrix Forster 

 14, 25, 26. 



Unfortunately I have not seen specimens of these species. They are 

 about of the same size (abdomen 40-43. hind wing 35-37, Martin, 25), and 

 the descriptions and figures of ap])endages indicate very closely related if 

 not identical, species. In fact, with this evidence alone before me. I regard 

 aratrix as a synonym of chclifcra. 



Gynacantha adcla Martin 

 25, ^, 35- 



Abdomen male 44-45. female 44; hind wing male 42-43, female 43; 

 superior appendage male 5.1 ; stigma front wing 2.7-3. 



The margins of the genital fossa of the second abdominal segment of 

 the male are armed on either side, just anterior to the point of convergence, 

 with three to six small scale-like teeth in a single row; the auricles are each 

 armed with six or seven denticles. In one of the males from Bolivia in the 

 left front and hind wing M.,, distal to the loop in M4, is switched anteriorly 

 one row of cells, resulting in three rows of cells between M., and M^. This 



