GENUS CEROPTRES. 57 



Black ; the antennas and legs rufo-testaceous ; the coxse and hind 

 femora more or less blackish ; wings hyaline ; the nervures pallid- 

 yellow; front very finely punctured, almost smooth; mesonotum finely 

 transversely rugulose. Antenna, $ 13-, $ 15-jointed ; the third joint 

 not twice the length of the fourth. Apex of petiole smooth. Frontal 

 keels obsolete. 



Length 1 — 2*5 mm. 



I have two bred males with, the hinder tibiae infus- 

 cated. 



Rare in galls of Andricus noduli, Clydesdale. 

 Sweden, Germany, Austria. 



Genus Ceroptres. 



Ceroptres, Hartig, Germ. Zeit., ii, 186. 



Face with two distinct parallel keels, proceeding from the antennae to 

 the clypeus. Antenna} with 12 joints in $ , 15 in $ ; the antennae in 

 $ thickened towards the apex ; the third joint as long as the fourth ; in 

 <$ not incised or thickened. Pronotum in front with two acute con- 

 verging keels. Parapsidal furrows incomplete. The scutellar fovea} 

 small and indistinct. Median segment with two parallel straight 

 keels and with a squarish median area. The second and third abdo- 

 minal segments connate, occupying almost the whole abdomen ; in the 

 $ the second segment is shorter than the third. Eadial cellule closed. 

 Claws bifid. 



The separating suture between the second and third 

 abdominal segments is not easily seen, and was over- 

 looked by. Hartig. 



The systematic position of Ceroptres has given rise 

 to some divergence of opinion as to its affinities. 

 Hartig, as was pointed out (vol. iii, p. 152), divided 

 the family into two groups according as the second or 

 third abdominal segment was the larger of the two. 

 Hartig himself, not recognising the suture between the 

 second and third segments, looked upon them as one 

 only, and consequently he located Ceroptres with the 

 gall-making and inquiline species. Schenck and 

 Foerster, however, were aware of the presence of this 

 suture, and seeing that the second segment was 

 shorter than the third transferred Ceroptres to the 

 FigitincLy with which otherwise it has no affinity, either 

 in habits or in its general body structure. We have, 



