IXSECTS AFFECTIXC, PARK AXD WOODLAXD TREES 



yellow. The legs are ver\' slender and long, claws bifid, toothetl, and with 

 well developed empodium. The distended ahilomcn of the gravid female is 

 dark red with its load of eggs. The abdomen of the male is nearly black 

 and the claspers are tipped with very short, minute teeth. The puparium 

 is subconic, about ' 8 inch long, with the anterior two thirds dark straw color, 

 antl the posterior third dark rufous. The antennae and 

 prominent dorsal processes of tht- pupa an- rejjresented 

 in figure 60. The pupal mandibles are four toothed, Ki^.. 5, wing of European 



,.,,.,, 1 • • 11 1 1 willow g.-ill midcP. Tniich 



tipped with light brown, chitinous, ami the ventral tooth t„L,rgc<i 



is nearly twice the size of the one next to it, which in turn is larger than 



the others, all curve some and taper to acute points. 



The larvae is stout, orange red, with i i easil)- distinguished segments. 

 It is I 8 inch long, and the "breast bone" or sternal spatula is nearly black, 

 enlarged slightly at both extremities, and two toothed anterior!)'. 



The reddish orange eggs are lanceo-elliptic in outline, and are about 

 '/-^s inch in length. 



The gall occurs on the smaller shoots of the willow, and is a 

 more or less irregular enlargement about '2 inch, in length | pi. 50, 

 fig. 4J. The bark from the infested portions turns brown or black 

 before the insects appear, and the pupal case remains ])rotruding 

 from the empty gall. 

 _. , ^ Parasites. Several parasites were reared b\- the writ(.-r from this 



rig, 60 Pii- 1 



E'urcpl"an'' species aud they ha\e been kindl)' identified by 1 )r .Ashmead, 

 willow gall ^] -Q ,]^ jI^^, courtesv of I)r L. ( ). Howard, as follows : T r i d \' m u s 



midge, .--. 



wr'^^'d "" sal i c i s Nees, a species not previously known to occur in .America ; 

 Tridvmus metal licus .\shm. was breil in small numi)ers from galls 

 received in the spring of 1 qoj, and 1' o 1 y g o n o t u s s a 1 i c i c o 1 a Ashm., 

 was reared in considerable numbers. The presence of sevc-ral parasites, 

 and the abundance of at least one, leails to the hoi)e that natural agents will 

 soon control this pest. 



Remedial measures. There is a|)[)arently no l)etter method of check- 

 in^r this insect than bv cutting and Inirning the infested shoots in early 



