ANDEIOUS QUADEILINEATUS. 95 



11. ANDEIOUS QUADEILINEATUS. 



PL VIII, fig. 3, gall; PI. XV, fig. 4. 



Andricus quadrilineatus, Htg., Germs. Zeits., ii, 190 ; Schenck, 

 Nass. Cyn., 74, 77, and 111 ; Mayr, 

 Eichengallen, pi. vii, fig. 84 (85) ; 

 Europ. Cyn., 21; Fitcli, Trans. 

 Essex Field Club, 146, fig. 47. 



Cynips 4-lineatus, Thorns., Opusc. Ent., 784. 



Andricus flavicornis, Schenck, 1. c., 75 and 80. 



— pedunculi, 1. c, 74, 77, 111. 



— ambiguus, 1. c, 111. 



— verrucosus, 1. c, 112. 



— gldbrusculus, 1. c, 112. 



Aphilothrix quadrilineatus, Adler, Zeits. wiss. Zool., xxxv, 204, 



pi. ii, fig. 22; Licht. Cyn., 69, 

 pi. ii, fig. 22. 



Shining, finely shagreened, scutellum finely rugose, the pleurae and 

 median segment bearing a short whitish pubescence; brownish-red, 

 two lines on the median lobe of the mesonotum, and one on the lateral 

 and the scutellar foveas black; vertex and antenna infuscated or 

 blackish; legs testaceous or pale brownish, the base of coxa?, tro- 

 chanters, and more or less of femora infuscated. Wings clear hyaline, 

 the nervures dark brownish ; the cubitus and base of radial cellule very 

 slightly infuscated. $ . 



Length 2| — 3 mm. 



A very variable species, and impossible to be sepa- 

 rated by any tangible characters from A. albopunctatus, 

 A. callidoma, A. Malpighii, and A. seminationis. 



The gall is found on the male catkins, usually gre- 

 gariously. Their normal form is ovoid, but may be 

 spherical, especially when attacked by Synergi ; the 

 surface is longitudinally furrowed, but not very regu- 

 larly ; at first the colour is whitish or reddish, then 

 brownish, or brownish with a green tinge, almost 

 glabrous. In length it is from 2J to 4 mm. It appears 

 in May, and falls to the earth with the catkins, the 

 insect emerging in the following spring, or even in 

 the spring of the second year. A few specimens show 

 a short blunt peduncle. On the whole it is rather a 

 variable gall in form. The various species named by 

 Schenck after the galls only were founded on these 

 variations. 



