REPORT OF THE STATE ENTOMOLOGIST I905 



119 



Fig. 



22 Lasioptera vitis, ventral aspect of 

 larval head, much enlarged (Original) 



appearance to this organ. Chitinous fork or " breastbone " stout, 

 slightly expanded posteriorly, widely produced anteriorly in two 

 conspicuous lateral processes 

 and with a pair of large, 

 well separated anterior teeth. 

 Terminal segment about one 

 half the width of the body, 

 distinctly produced posteri- 

 orly and bisected ventrally 

 by the slitlike anal orifice. 



Grape gall fly (Lasiop- 

 tera vitis (O. S.). The 

 large, irregular, reddish mass 

 of tissue produced by this insect has been repeatedly described, 

 while so far as known the larva has not been characterized, though 

 it is an exceedingly peculiar form. 



Larva. The full grown larva is about 3 mm long, 

 yellowish in color and rather slender. Head some- 

 what retracted, short, tapering rapidly to a nearly 

 truncate anterior margin. Antennae short, stout, 

 basal segment stout, about two thirds as long as broad, 

 apical segment about as long as broad, gently rounded 

 apically and apparently excavated ventrally, there 

 being two broad, ventral, flaplike appendages with 

 gently rounded margins. Chitinous fork or " breast- 

 bone " very short, its posterior portion being indis- 

 tinct, anterior portion broad, stout and with a pair of 

 Fig. 23 Lasiop- large, acute, cephalic teeth. Body with many trans- 

 breastbone, much verse wrinkles, posterior extremity with a simple anal 

 enlarged (Origi- ^jj^ ^^^^ ^^^j^j^ ^ p^j^. ^^ rather prominent submedian 



pseudopods arising from tuberculelike elevations, the 

 terminal portion of these appendages somewhat fusiform. Anterior 

 of the pseudopods there is a median, large, subtriangular elevation 

 bearing numerous minute tuberculate processes. 



Willow potato 

 gall (Rhabdo- 

 phaga bata- 

 t u s Walsh). Very 

 irregular, gouty, 

 polythalamous en- 

 largements occur 



on the shoots of Fig. 24 Lasioptera vitis, larva, dorsal aspect of pt>steri()r 



extremity, much enlarged (Original) 



low swamp wil- 

 lows, specimens taken at Karner .April 13, 1903, produced adults 

 the 27th. The pupae wriggle partly out of the gall as in the case 



