412 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



abdominal segment clothed with hair of the same color, while the 

 succeeding segments are black-haired, with apical fringes of white 

 hair. Wiedemann states that the abdomen of his specimen was dor- 

 sally yeUow-haired in its whole length, with white segmental bands, 

 and only the venter black-haired and white-banded. The three other 

 specimens from Trinidad have the mesonotum and scuteUum black- 

 haired, vnth. only some small tufts of pale bro-svnish hair on the anterior 

 and posterior angles; in these specimens the base of the abdomen is 

 hkewise black-haired. One of the three last described specimens even 

 has the pleura? black-haired, while in the other two the pleurae are 

 fulvous-haired. All five specimens agree in the coloration of the 

 wings, which appears to be very constant, and also in the disposition 

 of the black and white vestiture of the tibiae. The specimens of 

 Walker and Osten Sacken agree with the two first mentioned, while 

 Schiner's specimen apparently belonged to the black form. Osten 

 Sacken has discussed an equally extreme variation in the thoracic 

 vestiture of Tahanus atratus} Stihasorna fulvohirtus has been pre- 

 viously recorded from Brazil (Wiedemann) , Ega (Teff e) on the upper 

 Amazon (Walker-Ricardo), Colombia (Schiner), and Panama (Osten 

 Sacken) . 



1 Mem. Boston See. Nat. Hist., vol. 2, 1875, p. 455. 



