ANDEIOUS EADIOIS. 83 



5. ANDEIOUS EADIOIS. 



PI. IV, figs. 3 (radicis) and 3 a (3-lineatus), galls; 

 PI. XIV, figs. 2 (radicis) and 2 a (S-lineatus). 



Cynips radicis, Fab., B. S. Suppl., 213, 10 ; Syst. Piez., 146, 11 ; 

 Htg., Germs. Zeits., ii, 207 ; iv,402; Schenck, 

 Nass. Cyn., 56, 62, and 121 ; Marshall, E. M. 

 M., iv, 7 ; Kaltenbach, Pfl., 667. 

 Aphilothrix radicis, Mayr, Eichengallen, 6, pi. i, fig. 1 ; Adler, 

 Zeits. f. wiss. Zool., xxxv, 167, pi. x, 

 fig. 5 ; Licht. Cyn., 22, pi. i, fig. 5 ; 

 Fitch, Essex Field Club, ii, 132, fig. 17. 

 Andricus trilineatus, Htg., Germs. Zeits., ii, 191 ; Mayr, Europ. 

 Oyn., 18 ; Marshall, E. M. M., iv, 101. 



— noduli, Htg., Germs. Zeits., ii, 191 ; Schenck, Nass. 



Cyn., 74, 75, 78, 111, and 119; Mayr, 

 Eichengallen, ii, pi. i, fig. 9 ; Adler, Zeit. f. 

 wiss. Zool., xxxv, 169, pi. x, fig. 5 a ; Licht. 

 Cyn., 24, pi. i, fig. 5 a ; Marshall, E. M. M., 

 iv, 102 ; Kaltenbach, Pfl., 667. 



— radicis, Mayr, Europ. Cyn., 26. 



Agamic Form. — Brownish-red on the head and thorax, the abdomen 

 without the brownish tinge ; the occiput, three brownish broad stripes on 

 the mesonotum, the mesonotum more or less at the base, the greater part 

 of the mesopleura? behind, the propleurse in part, the base of the coxa?, 

 the centre of the median segment, and a large roundish spot on either 

 side of the top of the second abdominal segment, black ; the hinder 

 tibia? more or less, and the claws, infuscated. Antennas with the basal 

 four or five joints brownish-red, the others more or less infuscated, 

 usually paler beneath. Head and thorax shagreened, densely covered 

 with a silky pubescence ; abdomen shining, the second segment with 

 a large part of its lower and hinder border covered thickly with white 

 hair ; the third segment is finely aciculate. Wings hyaline ; from the 

 areolet run two (often very indistinct) narrow, faint, diverging streaks 

 to near the edge of the wing. 



Length 4 — 6 mm. 



Gall polythalamous, sometimes composed of hun- 

 dreds of cells (Westwood relates having reared 1100 

 specimens from a gall 5 inches long by 1J inches 

 broad — cf. Int., ii, p. 128), and found at the roots of 

 oaks or a few feet up the trunk. At first they are 

 whitish, sometimes marked with pink or red, smooth 

 and soft ; becoming with age quite hard and woody, 

 and the surface frequently rough and irregular. The 

 single cells are irregular, usually roundish or oval. 



