122 



NEW YORK STATE MUSEUM 



subglobular and the 3d to i8th inclusive, pedicellate, 19th simple. 

 Each segment consists of a broadly expanded basal two thirds, 

 the remainder forming a simple, narrow pedicel. The enlarged 

 part bears a basal whorl of short, nearly straight setae followed by 

 irregularly placed, long, curved setae arising from conspicuous 

 tubercular elevations. Most of the segments appear to have a dis- 

 tinct though nearly invisible ridge with whitish, oval spots along 

 its length at the basal third of the enlargement. Male genitalia 

 with the clasp segment rather slender, strongly curved exteriorly, 

 nearly straight interiorly, the apical segment strongly curved and 



tapering gradually to an acute, 

 dark apical tooth. Dorsal la- 

 mella greatly dilated, broadly 

 rounded laterally, nearly di- 

 vided and widely separated 

 posteriorly ; ventral lamellae 

 slender, nearly parallel, taper- 

 ing gradually to a rather 

 acutely rounded apex. Stylet 

 rather prominent, stout, tip 

 broadly rounded. 



Described from alcoholic 

 specimens. 



Willow beak gall (R h a b- 

 d o p h a g a r i g i d a e n. 

 sp.). The galls of this species 

 are comparatively common on 

 the small willows (Salix 

 rigidae and S. 1 u c i d a) 

 in the vicinity of Albany and 

 may be instantly recognized 

 by their terminal or subter- 

 minal location and fusiform 

 shape. They are about an 

 inch long and are tipped with 

 a rather characteristic, slender, 

 curved beak. The gall of this 

 species was early described by Dr Fitch under the name of 

 Cecidomyia salicis, and on account of its specific name 

 being preoccupied, it was changed by Baron Osten Sacken to 

 C. rigidae. 



Female. Antennae dark brown, moniliform, composed of 24 or 

 25 segments and extending to the base of the wings ; basal segment 

 much enlarged, subglobular, the second short, thick, the third some- 

 what elongate and with a very short pedicel, the fifth and following 



i«l 



Fig. 29 Rhabdophaga rigidae, gall en 

 larged (Original) 



