DKSCRIPTIONS OF OAK-GALLS. 136 



and an insect on the same caul, from v. Hoyden's collection. 

 The gall agrees exactly with those specimens of A.Jlavicornis 

 which have narrow deep depressiof s between the ribs instead 

 of the farrows. The Andricus (a female) is undoubtedly 

 distinct, according to Prof. Schenck's description ; but 1 

 have myself found no difference, notwithstanding a detailed 

 examination; so will begin with Prof. Schenck's description, 

 that the antennae of the female o( A. pedunculi are 14-jointed, 

 whilst in A. fiavicornis they are 13-jointed ; however the 

 former species has only IS-jointed antennae. The thorax and 

 abdomen, according to Schenck, are black in A. pednnculi, 

 however they are coloured, just as in A.Jlavicornis. He 

 says the scutellum is more or less pointed at the apex ; 

 however the typical specimen only shows at the most an 

 undoubted partial enlargement of a fold, which is quite 

 immaterial. There is, then, no difference either between the 

 gall or the insect of the two species, A. pedunculi and 

 A. flavicornis, so that 1 can accept them as distinct; but the 

 name A. peduncnli must be retained, as Schenck has 

 described this species first. Of A. amhiguiis the gall only is 

 known. Prof. Schenck was so friendly as to send me the 

 types, which do not differ essentially from the other galls here 

 described, with the exception perhaps that they are still red 

 in colour, are both immature, and have altogether a fresher 

 appearance. One specimen is altogether in accordance with 

 the description given by Schenck, in that it is more nearly 

 spherical, and is furnished with irregular, undnlatory, narrow 

 and sharp longitudinal striations ; it is, however, more imma- 

 ture than the second specimen, which has thick, swollen, 

 regular, straight striations, with narrow furrows between 

 them, but it has also a slretched-out form. Of A. glabrius- 

 cuius the gall only is also known : the five types from which 

 it is described, from Von Heyden's collection, are before me. 

 Two specimens agree perfectly with the galls of A. quadri- 

 linealus and A. peduticuli; of a third specimen tiiere is 

 hardly anything but the inner gall existing, the greater ])art 

 of the gall substance having gone. Two specimens are more 

 clearly distinguished ; they have only fine, irregular, faintly 

 raised ribs, which run in a longitudinal and oblique direction, 

 so that these specimens come very near to the next species 

 [A. verrucosus), although that is described as doubtfully 

 distinct. The galls collected by me from Quercns peduncu- 

 lata (mentioned above) I cannot assign to any other species 

 than A. (juadriliueatus, Hart., or A, pedunculi, Schenck, 



