260 IBALIA. 



indistinct minute areolet on its inner angle ; legs 

 ochreous. Length 1^, alar exp. 3 lines. 



In Morton's Cycl. of Agric., where this species is 

 described, it is stated to have been bred from aphides, 

 and also that it originates " globular red excres- 

 cences upon oak leaves.' 5 There is an evident mixture 

 of species here. The head and thorax being rugose, 

 hardly fits Allotria. Curtis compares it with Allotria 

 fulviceps. 



Cynips fulviceps (B. E., pi. 688). Glossy black, 

 antennae longish, thirteen- jointed, fuscous, ochreous 

 at base; head and legs bright ochreous ; wings irides- 

 cent, nervures bright brown; areolet none. Length 

 ^ line ; alar exp. nearly 2 lines. 



This is certainly an Allotria. It is stated by Hali- 

 day (Ent. Mag., ii, 102) to prey on the aphides of 

 willows, cow-parsnip, and other plants. 



Sub-family IBALINA. 



The characteristic features of this very distinct 

 group have been already given (p. 156). It contains 

 only one genus, namely 



IBALIA. 



Ibalia, Latreille, Hist. Nat. des Crust, et des Ins., i, 205. 



The antennae are about the length of the abdomen ; 

 in the ? thirteen- jointed, with the third joint not 

 much longer than the fourth ; in the 3 fifteen-jointed, 

 the third joint strongly obliquely incised. The front is 

 excavated in the middle, the excavation with a distinct 

 margin ; the occiput strongly concave ; cheeks emar- 

 ginate. Head and thorax strongly transversely 

 rugosely striolated. Pronotum raised and incised in 

 the middle above. Mesonotum with three longi- 

 tudinal furrows. Scutellum with two large, smooth 



