I20 



NEW YORK STATE MUSEUM 



of some other species, the flies escaping and leaving the white pupal 

 skins adorning the surface of the gall. 



Fein ale. Antennae reddish 

 brown, moniliform, reaching to 

 the base of the abdomen and 

 consisting of 20 subsessile seg- 

 ments, the basal one enlarged, 

 subglobular, the second short, 

 the third about twice the length 

 of the preceding and the others 

 decreasing gradually in length 

 to the extremity. There is on 

 each segment a subbasal whorl 

 of rather short, nearly straight 

 setae, while the central portion 

 is more or less irregularly or- 

 namented with long, curved 

 setae arising from conspicuous 

 tubercular elevations. The seg- 

 ments are marked with more 

 or less distinct smooth, trans- 

 verse lines containing oval, 

 whitish spots at the basal third 

 and near the apex. In one or two instances there appears to be. a 

 slight ridge as described for R. r i g i d a e. Eyes black, coarsely 

 granulate, inclosing the base of the antennae ; palps composed of five 



Fig. 25 Rhabdophaga batatus, gall en 

 llarged (Original) 



Fig. 26 Rhabdophaga batatus , two antennal segments of female, . 

 with views of two other segments, much, enlarged (Original) 



segments, the basal short, rather small, second and third thick, sub- 

 equal, the fourth the same length as the third, more slender and the 

 fifth about one half longer than the fourth. Mesonotum dark brown 

 with a somewhat distinct median, lighter, broad vitta. Scutellum 



