44 E. B. Williamson 



abdominal segment. The auricles are armed with five to seven denticles. 

 The female abdominal appendages are narrow, slightly widening on the inner 

 edge from the base to about two-thirds the length where the maximum width 

 is about .6; the median keel on the apical third low and inconspicuous; 

 apical third tapering symmetrically to the apex, with the extreme apex acute. 



Dr. Ris (35) has studied this species carefully and places C. rohnsta 

 Kolbe as a synonym. 



Material examined: Brazil (through Scheider, Berlin, i female, Ris), 

 Minas Geraes (Rolle, 1914, i female, Ris), Bom Jesus de Itabapoana, Rio 

 Janeiro (Zikan, January 21, 1905, i female, Ris), Salto Grande, Rio Par- 

 anopanema. Sao Paulo (J. D. Haseman, October 21, 1908, i male, Ace. 3202, 

 Carn. Mus.), Porto Catherina de Santa Leopoldina (2 males, E. B. W.) ; 

 .hijoitina, \'uto, Jujuy, 450 meters (Joergensen, April. 191 1, i male. Ris). 



Gynacantha croccipennis Martin 

 5, 24, 25, 26, 36. 



Abdomen male 55. female 60; hind wing male 54, female 57; superior 

 appendage male 7 ; stigma front wing 6. 



I have seen only the material from Peru and Bolivia in Dr. Ris' 

 collection, carefully studied by him (36). The young female from Pozuzo 

 is the only Peruvian specimen ; it is smaller than the others, abdomen 55 

 and hind wing 55 (not 52, as stated). Teneral specimens of bifida some- 

 times show some yellowing of the wings and it is not impossible that large 

 series of bifida would show that species to be as variable as ncn'osa is 

 known to be in this character. The same thing may be true of all the 

 nervosa group, including interioris to which species I am inclined to refer 

 this Pozuzo female, though I have seen no other specimens referred to that 

 species as darkly tinged as the Pozuzo female. The specific distinctness 

 of croccipennis is open to serious question. In the males, wing color, a 

 dubious character in this connection, alone separates it from bifida; and in 

 the females the same unreliable character alone separates it from bifda and 

 interioris. At the same time but little material is known and better char- 

 acters may be discovered later. Because of its geographical range and the 

 greater elevation at which it occurs as compared with bifida, the name 

 should stand for the present, though it is not improbable that a condition 

 analagous to that found in certain species of Hetaerina is duplicated hce, 

 for we know some lletaerinas of wide range, which, in the mountains, at- 

 tain a size and a depth and extent of wing coloration unrivalled by the 

 same species in lower situations. 



Gynacantha litoralis, new species 



Abdomen male 50; hind wing male 48; superior appendage male 6.6; 

 stigma front wing male 4.8. 



Male. — Labium and face pale yellowish brown ; f rons and frontal vesicle 

 black, a pale brown median transverse bar on either side of the frons, wider 

 than in interioris, and with its fellow of the opposite side defining a con- 



