Occasional Papers of the Museum of Zoology 19 



Obidos and Tapajos, Brazil, and I believe, it is H. moHhunda." 



12. Hctacrina mortua Hagen. 



British Guiana, Tump.tumari (6, 8, 11), Wismar (6, 11). 



Dr. Ris writes : "After re-examining your specimens, rep- 

 resenting a species not heretofore known to me, I am almost 

 certain it is H. mortua. The description of the thoracic pat- 

 tern does not fully agree, but the rest of the description and 

 the figure of the appendages in the Mon. Calop. seem to indi- 

 cate your species. It is strangely similar to H. dominula, but 

 there are rather striking differences in both the superior and 

 inferior appendages." In the field it will be difficult to dis- 

 tinguish these two species (dominula and mortua), even with 

 the aid of a small hand lens. In the males, dominula has the 

 red apical spot of the hind wings duller, more diffuse and 

 with some brown edging, and the post-occipital tubercles are 

 low and rounded, scarcely discernible to the unaided eye ; in 

 mortua the apical red spot is bright, not diffuse, and with 

 imperceptible brown, and the post-occipital tubercles are angu- 

 lar and plainly discernible. 



13. Hetaerina pilula Calvert. 

 Guatemala, Santo Tomas (9, 10, 15). 



Heretofore only two specimens of this species, one from 

 Mexico and one from Guatemala (B. C. A.), have been known. 



14. Hetaerina sanguinea Selys. 



Peru, Co'lonia del Perene (4, 9), San Ramon. 



This species was found on the lower, slower and sunnier 

 parts of quebradas, and, in its relation to charca, resembles the 

 frequent relation of caja to macropus. Macropus was also 

 taken at Colonia del Perene, but only at one place, and its 

 distribution on streams, relative to charca and sanguinea, was 

 not determined. 



