1898.] NATURAL SCIENCES OF PHILADELPHIA. 445 



CONTRIBUTIONS TO A KNOWLEDGE OF THE HYMENOPTERA OF 

 BRAZIL, NO. 5.- VESPLDJE. 



BY WILLIAM J. FOX. 



This paper relates solely to the social wasps, which are, in the 

 present author's opinion, not only distinct in their habits from the 

 solitary species, but differ also in having the middle tibiae always 

 with two spurs. 



In stating the sex of a specimen throughout this paper I have not 

 been quite sure whether certain specimens represented females or 

 workers, and therefore, when the sex represented is other than the 

 male, I have written female, or worker. 



I understand it is the intention of Mr. Herbert Smith to contrib- 

 ute a memoir on the nests of these insects of which he has a large 

 number. These are at present stored away in boxes and are 

 unavailable. Therefore, for the descriptions of the nests of the new 

 and other species noted herein those interested must await Mr. 

 Smith's return from South America where he expects to pass two 

 years collecting natural history specimens. 



Mischocyttarus labiatus Fabr. 



Rio de Janeiro, October, November; Mararu, April; Chapada, 

 March, April; Uacarizal, February; Pedra Branca, April; San- 

 tarem. About 50 specimens. 



Apoica pallida Oliv. 



Rio de Janeiro, November ; Chapada, January, April, October; 

 Santarem. Fifteen specimens. 



This is quite a variable species the body color running from 

 entirely whitish-yellow to dark brown. The following forms are in 

 the collection : 



1. Entirely yellowish-white; antennae white at tip; costal cell 

 clear, wings whitish. 



2. Yellowish-white, with vertex, dorsulum in part, sutures of 

 thorax, legs, petiole at base, and apical margins of segments obscurely, 

 pale brown ; costal cell a little ferruginous, wings whitish. 



3. Same as No. 2, but with dorsulum entirely brown, which color 

 is well spread out over the entire thorax but in a very pale tint ; 



