Triacanthagyx\ and Gynacantha 19 



I female, A. N. S.) ; Bolkia, Province del Sara, Dept. Sta. Cruz, 350 m 

 (Jose Steinbach, February, 1913, i female, Ace. 5076, Carn. IMus. ) ; I'enezn- 

 cia (Appun, i male, M. C. Z.), Puerto Cabello (i female, M. C. Z.), Palma 

 Sola, Dept. Falcon (March 4-10, 1920, 10 males, 5 females, E. B. W.), 

 Tachira, Dept. Falcon, about 364 m (x\pril 11, 1920, i male, E. B. W.) ; 

 Dutch Guiana (i female, O. S. U. ; i male. U. S. N. M. ; i female, M. C. 

 Z. ; I male, i female, Ris), Paramaraibo (K. Mayo, i female, A. X. S.) ; 

 French Guiana, Cayenne (S. M. Klages, February, 1917, 3 males, i female, 

 Ace. 5873, Carn. Mus.) ; Brazil, Para (February 6, 1901. i female, Ris; C. 

 F. Baker, i female, E. B. W.), Santarem (A. H. Fassl. July. 1920, i female, 

 Ris), Manaos (Miss H. B. Merrill, 2 males, 2 females, U. S. N. M.). Bom 

 Jesus de Itabapoana, Rio Janiero (Zikan, March 26, 1906, i female, Ris) ; 

 Trinidad, San Juan (March 2. 1912, i female, E. B. VV. ) ; Cuba ( Poey. i 

 male, i female, M. C. Z.). See also discussion above of specimens in the 

 de Selys Collection. 



Triacanthagyna ditzleri, new species 



6 (Chapada male as triUda), 10 (April female and August male as trifida, September 



female as septima). 



Abdomen male 36-40, female 41-43 ; hind wing male 33-36, female 37-42 ; 

 superior appendage male 4.8, female 6-6.9; stigma front wing 3.4-3.6. 



Male. — Living colors, from notes on the Palma Sola male, March 6, 1920. 

 (Descriptive notes in parentheses made from preserved specimens.) Eyes 

 above dark green, in front on either side an oblique line of bright blue, 

 narrowly bordered on its upper edge with black especially at the superior 

 end of the line; lower half of eyes pale green with a slight brownish cast 

 and one conspicuous black and five or six smaller brown pseudo-pupillae. 

 (Face green, paler and duller below, darker to black above, anteclypeus 

 brown; frons above in front black, stem of T-spot obscure or wanting; 

 frontal vesicle black ; occiput small, green. ) Rear of head greenish yellow, 

 a broad black band from foramen to occiput. 



Prothorax brown, anterior lobe blue, elevation of posterior lobe dark 

 brown, the free edge narrowly greenish blue. 



Thorax brilliant grass green, marked with rich dark brown, almost black 

 on the dorsum ; dark mid-dorsal area nipple-shaped, narrower above, the 

 edge on either side at midheight concave then widening out and convex 

 below. Antehumeral stripe wide, almost as dark as the dorsal area, shading 

 out above, especially anteriorly, and very narrowly joined above with the 

 middorsal area; two lateral narrow brown stripes, the first the wider and 

 forked above ; interalar spots green. 



Abdomen above rich reddish brown, almost black, ai)ex of 7 and 8 and 

 9 paler. In a male from La Fria the thorax above and the abdomen above 

 were entirely black, not brown and not paler apically. Abdominal markings 

 bright green as follows : i with D interrupted, L present ; 2 with AD taper- 

 ing from base to apex, AML large, MD narrow and triangular. PD narrowly 

 divided in the mid line, PL and PD not joined, PL about the same size as 

 PD on either side, both small; (two or three denticles on each auricle; 



