1898.] NATURAL SCIENCES OF PHILADELPHIA. 449 



Polybia occidentalis Oliv. (==pygmcea Fabr.). 



About 250 specimens of typical occidentalis, and over 60 represent- 

 ing pygmcea Fabr., which I regard as a variety of this species. The 

 large series before me shows that the two supposed species intergrade. 

 Both forms seem to occur in the same localities simultaneously. 

 From Chapada, Santarem and Rio de Janeiro, March, April, Sept- 

 ember, October. 



Quite as large a series of individuals, having the head reddish, is 

 also represented. This form is not distinct as a species from occi- 

 dentalis. Occurs in the same regions and at same time as typical 

 occidentalis. 



Polybia oecodoma Sauss. 



Rio de Janeiro and Chapada in November. Six examples. 



Polybia scutellaris White. 



Chapada, March, October, December. Nearly 100 specimens, of 

 which 90 per cent., represent a variety with the head and part of 

 thorax above, rusty-red. 



Polybia pumila Sauss. 



About 100 specimens from Chapada and Sebastian March, April, 

 October, November. 



Polybia pediculata Sauss. 



Chapada, October ; Para, June ; Santarem. Over 60 examples. 



Polybia rejecta Fabr. 



Mararu, April ; Chapada, January, April, September, October ; 

 Santarem ; Sebastise, October. About 50 specimens, whose colora- 

 tion is quite constant. 



P. bicolor Smith is evidently synonymous with rejecta. 



Polybia Jurinei Sauss. 



Over 60 examples, not showing any variation of color. Chapada, 

 January, September, December; Rio de Janeiro, November; Mar- 

 aru, April ; Santarem. 



Polybia metathoracica Sauss. 



Chapada and Mararu (April) ; Santarem. Three specimens of 

 the typical form. 



Polybia bifasciata Sauss. 



Two specimens from Santarem. 



