1865.] 371 



gall-fly occurs only on soft, green shoots of the same year's growth, 

 whereas the galls of the last year's growth, the only ones described by 

 Dr. Fitch, always give guest-flies. These guest-flies, as I have had 

 occasion to observe myself, belong to the genus Ceroptres. We can 

 take it for certain, therefore, that Ci/nips q. arbos Fitch, the male of 

 which is said to have 15-jointed antennae, is a Ceroptres. Whether 

 0. q. tuber Fitch, belongs to the same genus, is somewhat doubtful, as 

 it is said to have 14-($ ) and 12-( 9 ) jointed antennae. Whether this 

 statement is based upon a mistake, or whether Ceroptres % sometimes 

 has 14-jointed antennas (which would agree with Hartig's statement), 

 or, finally, whether C. q tuber Fitch, belongs to some other inquilinous 

 genus, I do not pretend to decide. The last hypothesis, however, seems 

 to me the most improbable of all. 



7. I have bred numerous % and 9 specimens of Ceroptres from the 

 gall of C. q. batatus Fitch (the same gall which I erroneously took, 

 Pr:c. etc. I, 71, 27, for that of C. q. tuber Fitch). These specimens 

 were mentioned by me (1. c.) as belonging to Ambli/notus. They vary 

 very much in size and in the coloring of the feet, which are more or 

 less infuscated ; some specimens have the hind femora and tibiae almost 

 black. Most specimens have the cheeks reddish, which distinguish 

 them from my specimens of C. petiolicola and of C. arbos with which 

 they otherwise closely agree. The tip of the ventral valve forms, usu- 

 ally, an angle of 45°, sometimes a little larger; the $ antennae are 12- 

 jointed. I leave it undecided whether all the specimens showing the 

 above differences belong to the same species, and whether this species 

 is only a phytophagic variety or race of C. petiolicola and C. arbos. 



8. Besides the above-mentioned doubtful species, I possess several 

 specimens of the same genus, but which certainly belong to a distinct 

 species. Without naming or describing this species, I will, by a short 

 notice, draw the attention of observers to it. I have bred these speci- 

 mens from the gall of Ci/nips verrucarum 0. S. (Q. obtusiloba). They 

 are hardly 0.5 long, black, with yellow feet; parapsidal grooves not 

 apparent, except near the scutellum ; surface of the thorax smooth, 

 with an exceedingly fine, hardly apparent pubescence; viewed from 

 above, the thoracic dorsum seems to be slightly flattened. The antennae 

 ( 9 ) are 12-joirited and somewhat iucrassated towards the tip. This 

 is the species which Dr. Reinhard returned to me as the true represen- 

 tative of Ceroptres Hartig. 



Genus SYNERGUS. 

 The structure of the abdomen affords the characteristic marks of this 



