HYMENOPTERA. ACULEATA. 205 



known by the kidney-shaped eyes and the presence of 

 four submarginal cells in the wings. The other English 

 genera of Fossores, with kidney-shaped eyes, differ in 

 the venation of the wings. The antennae are long, and 

 somewhat club-shaped. The legs are slender and spine- 

 less ; and thus the Sapyga is found making its cells 

 either in burrows ready formed in the ground by other 

 insects, or excavated by them in wood, or sometimes it 

 makes use of small snail shells. S. punctata, the most 

 common of the two species, is black, with small white 

 markings on the head and thorax, the abdomen black 

 and red, with white spots. 



The third family, PompilidaB. contains three genera. 

 Pornpilus (twenty species) is the principal ; the others 

 (Ceropales, with four, andAporus, with two submarginal 

 cells) containing together but three species, none of 

 them common. 



In Pompilus the wings have three submarginal cells, 

 and the head is transverse ; the antennae are inserted in 

 the middle of the face, and curled in the female. The 

 hind legs are long; the abdomen is egg-shaped in the 

 female, longer and more slender in the male, and attached 

 by a very short stalk. The legs vary so much in different 

 species, that the genus has been subdivided according to 

 the presence or absence of hair fringes and spines, and 

 this variety of structure affords an indication to variety 

 of habit. These differences consist in the presence or ab- 

 sence of cilise on the tarsi of the fore-legs, and of spines 

 (in double or single row, or irregularly placed), or of serra- 

 tions in the tibia? of the two other pairs. The hind legs 

 are long throughout the genus. The colours are chiefly 

 black ; or black and red, or reddish brown, sometimes 

 with white spots, wings usually somewhat dark. The 



