134 NEUROTERTJS PQMIPENNIS. 



Spathegaster tricolor, Htg., 1. c, 341 ; Schenck, Beitrage, 107 

 and 135; Mayr, Eichengallen, 49, 

 pi. vi, fig. 71; Europ.Cyn., 38; Adler, 

 Zeits. wiss. Zool., 1880, 165, pi. x, 

 fig. 4 a; Licht., Oyn., 19, pi. i, fig. 4 a. 

 — varius, Schenck, Beitrage, 87. 



Agamic Form. —Black ; antennae brownish, the basal three joints and 

 legs yellow ; coxae generally brownish ; wings hyaline, a brownish 

 splash, in first cubital cellule. Mesonotum finely and distinctly acicu- 

 lated, striated or wrinkled at the sides, the centre less strongly 

 shagreened and more shining ; scutellum shagreened strongly and 

 striated. 



Length 2 — 2*8 mm. 



It is difficult to distinguish this species from 

 numismatis ; the mesonotum is, however, generally 

 more strongly aciculated, the basal two joints of the 

 antennas are yellow, and the legs are usually of a 

 much clearer yellow than in the other species. 



Gall. — This gall resembles very closely that of 

 lenticularis, from which it is not always easily 

 recognised. It is smaller, never exceeding 3 mm., is 

 much redder in tint ; the border is more distinctly 

 curled up, the centre being thus more depressed, and 

 instead of being gradually raised there, there is only 

 a small knob-like elevation ; the under side bears 

 stellate hairs, but not so thickly as the upper side ; 

 and it is also darker on the lower side, being never 

 whitish or yellowish as in lenticularis ; and, lastly, it 

 is much less gregarious. 



The larva does not develop till April, being later in 

 its period of development than lenticularis and numis- 

 matis, the imago not appearing till May. 



Inquiline. — Synergus Tschehi. 



Parasite. — Torymus sodalis. 



Sexual Form. — Black ; the two basal joints of the antenna? clear 

 brown, tegulse light testaceous, legs yellowish -red, abdomen broadly 

 yellowish at the base. Head and mesonotum aciculated, the middle 

 lobe of mesonotum more shining, but slightly aciculated in some speci- 

 mens. Scutellum rugose. Wings subhyaline at the base, the apex 

 smoky ; a large smoky cloud at the end of the first cubital, and a smaller 

 one at the end of radial cellules. £ . 



Length 2 mm. 



