184 



Forty-first Report on the State Museu3l 



Description of th.e Galls. 

 The tip of a seedling grape and some separate leaves were received 



on the seventh of June, 

 from Mr. Henry Lee, of 

 Middlehope, Orange 

 county, N. Y., upon which 

 were numerous galls of 

 Lasioptera vitis. The tip, 

 for about five inches of its 

 extent, was covered by the 

 abnormal growth upon it, 

 and so distorted that it was 

 bent downward until its 

 natural direction was com- 

 pletely reversed. The older 

 galls were bright red, the 

 younger ones still green. 

 They were frequently con- 

 fluent — three or four hav- 

 ing united to form one 

 elongated, irregular swell- 

 ing. Figure 29, represents 

 a vine infested in this 

 manner. 



The leaf-galls are of a 

 smaller size than those of 

 the tip, averaging two- 

 tenths of an inch in diam- 

 eter. They, in most cases, 

 rest on the veins, but a few 

 only touch them on one 

 side; rarely, they are entirely disconnected. Their upper side is red 

 (on the upper side of the leaf), while the obverse, withdrawn from 

 sunlight, is green. Those containing a single cell, are round, with 

 more than one-half of the gall showing on the u.nder side of the leaf, 

 and with its connecting vein bent downward on its surface. The 

 larger number are single-celled — the result of a single oviposition. 

 The confluent ones, or even the elongated, occurring on the vine more 

 frequently than on the leaf, of course contain 'two or more cells, as 

 shown in section, in the figure at a. 



On a part of a leaf within an area of an inch and a half in diameter, 

 thirty galls were counted. 



Fig. 29.— Galls of Lasiopteea vitis, on grape- 

 vine ; a, section of a compound gall, showing the 

 larval cells. 



