KEY TO AMERICAN INSECT GALLS 



17 



A subglobose terminal swelling involving the tip of the new growth of 

 P. e d u 1 i s, diameter 5 mm. This kills the apical needles, though the lower 

 ones continue to develop, and in old deformities may produce a ring of short, 

 stout, upstanding needles surrounding a central dead area. Larvae pale 

 orange. 



Itonid. C e c i d o m y i a sp. a2823 

 Apical budlike swelling, diameter i cm on P. s c o p u 1 o r u m. Figs. 5, 6. 

 Felt 'i2f, p. 240 



Itonid. Pine bud gall, C o n t a r i n 1 a c o 1 o r a d e n s i s Felt 

 Same gall as above. Felt 'Ilk, p. 549 



Itonid. Dicrodiplosis gi^ll^ettei Felt 



Fig. 5. Pine bud gall, Contarinia 

 coloradensis Felt- Three galls. 

 (Original) 



Fig. 6. Pine bud gall, Contarinia colo- 

 radensis Felt. Cluster of galls on P. 

 scopulorum. (Original) 



Aborted needle clusters, basi subglobose. On P. r i g i d a. Fig. 7. Felt 

 '06b, p. 423 



Itonid. Pine needle gall, Cecidomyia pinirigidae Pack. 



Globose swellings at base of needles of P. e d u 1 i s, diameter 4 mm, the 



aborted needles with a length of i to 3 cm, the walls thick. Felt, 'i8d, p. 381 



Itonid. ?Thecodiplosis cockerelli Felt 



Elongate, cylindric or fusiform green or purplish-red swellings at the 



base of the needles of P. e d u 1 i s, length 1.5 cm, diameter 3 mm, the 



walls moderately thin and with a large cavity containing several larvae. Occurs 



also on P. monophyllus (a2857) 



Itonid. Cec'domyia sp. a282i 



