12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 12s 



Male genitalia as illustrated by figures 5b-e with harpes fused only 

 at base; with aedeagus fairly straight, not curved upward at distal 

 end and thus differing from all the other species of Calystryma except 

 C. trebula (from which it is easily separated by the shape of the harpes, 

 gnathal arms, and saccus) ; with gnathal arm distally acute and having 

 a large carina near middle; with lateral lobe of uncus broadly produced 

 below middle and with a minimal projection on lower margin. Eighth 

 tergite (fig. 5a) shallowly incised along posterior margin, subtriangular 

 in shape and with blunt posterior lobes. This structure most similar 

 to that of C. Mora but more triangular in shape. 



Female (pi. 2 : fig. 7) . — Wings above brown, much lighter in shade 

 than in the species heretofore described. Hindwing with a slightly 

 darker brown marginal spot on interspace Cui and with a thin white 

 marginal line around outer margin from 2d A to vein R 8 , this line 

 very faint above vein M 2 . Anal lobe with a small pale orange-red 

 spot. Wings underneath similar to those of male with marginal 

 ocular marking of interspace M 3 very faint and with black center of 

 marginal ocular marking of interspace Cuj triangular in shape. 



Length of forewing 12.5 mm. 



Female genitalia as illustrated by figure 21 with ductus bursae 

 and bursa copulatrix relatively short, shorter than in any species of 

 Calystryma except C. tijla and shorter than in C. malta (even though 

 the relative length compared to width of the superior genital plate 

 in C malta is less), their combined lengths being under three and 

 one-half times the width of the superior genital plate; the latter with 

 its free edge divided into two lateral elements, each with the posterior 

 spurlike process found on related species replaced by a broad lobe 

 and each with the anterior spurlike process reduced in size, indicated 

 by short and broadly pointed lobes. 



Type-locality. — Dutch Guiana ("Surinam"). 



Additional type data. — Originally described by Druce from seven 

 specimens of both sexes. Since no single specimen was stated to be 

 the type in the original description, all seven of these specimens are 

 therefore syntypes (art. 73, pars, b and c of the "International Code 

 of Zoological Nomenclature" adopted by the XV International 

 Congress of Zoology and published in London in 1961). I hereby 

 designate as the lee to type the one labeled type (with the type no. 

 Rh. 962, genitalia preparation no. R. 1951 NHB 495). This lecto- 

 type is illustrated by figures 3 and 4 on plate 3. 



Location of type. — In the British Museum (Natural History). 



Method of identification. — The genitalia of the lectotype were 

 dissected, studied, and compared with the genitalia of one of the 

 other syntypes by D. S. Fletcher of the Department of Entomology, 

 British Museum (Natural History). This syntype was found to be 



