GENUS AULAX. 45 



ochreous, the lower sheath, brown ; wings pale fuscous, 

 iridescent, the nervures brown, edges of the marginal 

 cell suffused; anterior legs pale ochreous, interme- 

 diate brown, hinder piceous, base of all the thighs 

 darker ; apical joint of tarsi fuscous. 



Distinguished from B. rosse by the large ocelli, cari- 

 nate scutel, dark hinder legs, the absence of the 

 brown splash on the ocast of the upper wings, and of 

 the areolet. . July. Dover." 



Gloucester, West Wickham, London district. 



Continental distribution : Germany, Austria. 



Genus Aulax. 



Aylax, Hartig, Germ. Zeit., ii, 186. 



Aulax, Mayr, Genera, 20. 



Isocolus, Foerster, Yerh. z.-b. Ges. Wien, 1869, 330. 



Eubothrus, Foerster, 1. c, 331. 



Liposthenus, Foerster, 1. c, 331. 



Head and thorax aciculate, coriaceous, or punctured. Cheeks with- 

 out furrows, as long as the length of the eyes. Antennse 13 — 14- $ , 

 <$ 14 — 15-jointed, the third joint with the latter curved; the third 

 joint may be longer or shorter than the fourth. Pronotum sometimes 

 with two parallel keels in the middle. Parapsidal furrows complete. 

 Scutellar fovea? distinct, clearly separated. Scutellum separated from 

 the mesonotum by a furrow. The two keels on the median segment 

 are either parallel or diverging at the apex. Abdomen sessile, seldom 

 compressed, the second segment longer than the others, of different 

 length. The radial cellule is of different lengths, broad at the base, 

 open or more or less closed ; the areolet present or absent. Claws 

 simple. 



The species of Aulax bear considerable resemblance 

 to those of Synergus, but may easily be known by the 

 petiole not being striolate nor two-jointed. They 

 have the head and thorax black, with the abdomen 

 and legs more or less testaceous or yellowish. 



There are about a dozen European species known, 

 which form gall-like swellings on various herbaceous 

 plants. 



The peculiarities of Foerster' s Isocolus, Eubothrus, 

 and Liposthenus (here sunk in Aulax) may be seen by 

 reference to the table on pp. 33, 34. 



