50 ATJLAX HIERACII. 



2 (1) The hinder margin of the fore wings not ciliated ; abdomen 

 entirely, and the legs for the greater part, black ; scutellar 

 fovea? large ; the third and fourth joints of the antenna? about 

 equal. Scabiosas. 



4. AULAX HIERAOII. 



PI. IX, fig. 1 ; PI. XI, fig. 1 (graminis) ; PI. XII, 



fig. 11. 



Cynips Meracii, Bouche, Naturg. d. Ins., 164. 



Aylax sabaudi, Htg., Germs. Zeit., ii, 195. 



Aulax hieracii, Schenck, Nass. Oyn., 99 ; Mayr, Oyn. Gallen, 



9, Taf. i, fig. 4; Europ. Cyn., 8. 

 Aulax graminis, Cam., Proc. Nat. Hist. Soc. Glas., 1875, 322; 



Mayr, Oyn. Gallen, 6, fig. 1. 



Black ; the legs and the basal half of abdomen ferruginous ; the 

 antenna? dark ferruginous to brown, the basal two joints always darker 

 than the others ; the coxa? often more or less fuscous. Wings clear 

 hyaline ; the nervures pale fuscous ; the apex ciliated ; areolet present. 

 Mesonotum sub-opaque, strongly aciculate ; pleura? aciculate ; parap- 

 sidal furrows complete ; abdomen shining, impunctate. $ and $. 



Length 2 to 2*8 mm. 



The amount of ferruginous colour on the abdomen 

 and antennae varies ; in the <? the abdomen is usually 

 entirely black. 



In coloration it is not unlike A. papaveris, but the 

 13 -jointed antennae and the distinct parapsidal fur- 

 rows separate it from the poppy species. 



A. graminis cannot be distinguished by any charac- 

 ters, structurally or in coloration, from hieracii ; and 

 I am inclined to think that the two are identical not- 

 withstanding that they are found on different plants. 

 This seems the more likely from the fact that 

 A. hieracii has been bred from galls on Linaria vul- 

 garis and Gytisus capitatus (cf. Mayr, Eur. Oyn., 8). 



The galls are found chiefly on Hieracium sylvaticum 

 and H. boreale. They are found on all parts of the 

 plant, but more particularly on the stem, not far from 

 the flower-head. I have seen them also on the roots, 

 and they may affect even the flowers. As may be 

 seen by a reference to the figures on PI. IX, in form 

 they are very variable, this being also the case as 



