182 Zoology of Colorado 



(4) Stout fusiform gall on willow. Phytophaga rigidae Osten 

 Sacken. There is a rather similar gall due to a saw fly. 



(5) Cabbage-like gall common on willow. Rhabdophaga bras- 

 sicoides Walsh. 



(6) Large cone-like terminal gall on willow. Rhabdophaga 



strobiloides Walsh. 



(7) Potato-like gall on willow. Rhabdophaga batatas Walsh. 



(8) Slightly enlarged branches of willow. Phytophaga peroc- 

 culta Cockerell. (The common galls on cottonwoods are due 

 to Aphides). 



(9) Rounded fuzzy galls on Atriplex canescens, as far north as 

 White Rocks in Boulder County. Asphondylia neomexicana 

 Cockerell. 



(10) Galls in stems of Allionia, found by E. Bethel at Boul- 

 der. Lasioptera allioniae Felt. 



(11) Flower-gall, with thickened, enlarged sepals, on Stanley a 

 glauca. Perrisia stanleyae Cockerell. 



(12) Swollen fruit of Opuntia, the prickly-pear cactus. As- 

 phondylia betheli Cockerell. 



( 1 3) Flower-bud gall on Gutierrezia. Rhopalomyia gutierreziae 

 Cockerell. 



(14) Stem-gall on Chrysothamnus. Rhopalomyia bigeloviae 

 Cockerell. A different gall on Chrysothamnus is caused by As- 

 teromyia chrysothamni Felt. It was found near Boulder by Bethel. 



(15) Round woolly galls on Artemisia. Rhopalomyia alticola 

 Cockerell (Kieffer refers this to Miospatha). 



(16) White pubescent gall on Artemisia gnaphalodes. Rho- 

 palomyia gnaphalodis Felt. 



(17) Small fusiform galls on Artemisia frigida. Rhopalomyia 

 betheliana Cockerell. 



(18) Galls in deformed flower heads of Artemisia at Colorado 

 Springs. Rhopalomyia coloradella Cockerell. 



(19) Small galls densely covered with 

 white hair, on Aster crassulinus. Rhopalomyia 

 crassulina Cockerell. 



Rhopalomyia cocherelli Felt was found on 



a window at Boulder; it probably comes from ra ^ 1 a P c«T y Mid g C e°gan 



a gall in Senecio or Aster. Dasyneura cercocarpi ™ ]o **g £g^- 



Felt forms a gall on Cercocarpus at Golden, Evelyn Moore del. 



