446 PROCEEDINGS OF THE ACADEMY OF [1898. 



abdomen whitish above; costal cell quite ferruginous, the wings 

 not whitish, dark subhyaline. 



4. Head, thorax, legs and petiole quite brown, the cheeks, prono- 

 tum laterally, postscutellum, middle segment apically, and body of 

 abdomen pale yellowish ; wings colored as in No. 3. 



5. Entirely brown ; posterior margin of pronotum, two spots on 

 scutellum and postscutellum, apical margin of segments 1-5, and 

 greater part of sixth, yellowish wings as in No. 3. (=arborea f). 



6. Dark brown, the thorax above black ; first abdominal segment 

 narrowly yellow at apex ; wings as in No. 3 ; size large. 



It is quite probable that A. virginea and arborea are only varieties- 

 of A. pallida. 



Synoeca testacea Sauss. 



Mararu, April, May ; Santarem. Eight specimens. 

 Synoeca surinama Linne. 



A large series from Chapada, January to April, October ; Uacari- 

 zal, February ; Rio de Janeiro, November; Santarem. 



Synoeca cyanea Pabr. 



Rio de Janeiro, November. Two specimens. 



Synoeca azurea Sauss. 



One specimen. Chapada, December. In addition to the bluer 

 color and prominent tubercles of petioles this species is peculiar for 

 its small head which is barely as wide as thorax. 



The collection also contains a single $ specimen with the second 

 submarginal cell greatly narrowed above, the distance between the 

 first and second transverso-cubital veins at the top less than that 

 between the recurrent veins on the cubital vein. The head is about 

 as wide as thorax. Otherwise it is very close to surinama. 



Polistes Ferreri Sauss. 



A large series from Corumba, Chapada, Santarem and Rio de 

 Janeiro. 



Polistes bicolor Lep. 



Two specimens. Santarem. 

 Polistes versicolor Oliv. 



About 75 specimens. Benevedes, July ; Mararu, April ; Rio de 

 Janeiro, October and November ; Chapada, April and October ; 

 Santarem. The maculation of abdomen varies from a simple yellow 



