of Fossorial Hymenoptera. 53 



Genus Aporus, Spin. 



, Aporus quadrimaculatus. 



Female. Length 5f lines. Black, with a large ovate white 

 macula on each side of the second and third segments. Head : 

 the tips of the mandibles, the scape beneath, as well as the 

 four basal joints of the flagellum of the antenna? beneath, 

 fulvous. Thorax : the posterior margin of the scutellum, the 

 postscutellum, and the metathorax covered with a glittering 

 silvery pile that changes in different lights to sliades of 

 greater or less brilliancy ; the coxaj and femora also covered 

 with glittering pile ; the calcaria at the apex of the inter- 

 mediate and posterior tibias white ; the anterior wings dark 

 fuscous, with a hyaline fascia crossing them at the apex of 

 the first submarginal cell ; the externo-mcdian cell is also 

 hyaline, and the extreme apex of the wings pale ; the posterior 

 wings are hyaline and iriclescent, with a faint cloud at their 

 apex. The apical segment of the abdomen white, or yellowish 

 white. 



llab. Para ; Santarem. 



Aporus canescens. 



Female. Length 3j-5 lines. Black, and covered with 

 hoary pile, most thinly so on the vertex, disk of the thorax, 

 and base of the abdomen. Tips of the mandibles ferrugi- 

 nous ; wings dark fuscous, and having a coppery refulgence ; 

 the hoary pile is most dense at the base of the segments of 

 the abdomen. 



Hah. Para ; Ega. 



The male only differs in being smaller and less pilose ; the 

 wings are dark fuscous ; the metathorax concavely truncate. 



Aporus minufus. 



Male. Length 2 lines. Black, and thinly covered Avith a 

 line hoary pile ; smooth and shining ; the wings fusco- 

 hyaline ; the spines and calcaria on the intermediate and 

 posterior tibiai and tarsi elongate ; the apex of the meta- 

 thorax rounded; the abdomen narrow, and pointed at its 

 apex. 



Hab. Para. 



This insect is very like the male of A. canescens^ but, I 

 think, is a distinct species ; the metathorax is not distinctly 

 truncated. 



