Appencli:?i: B 



A CATALOGUE OF THE " PHYTOPTID " GALLS OF 

 NORTH AMERICA 



BY 

 GEORGE 11. CHADWICK, ZOOLOGIST 



Since Dr Hagen published his hst in 1885 [The Collection of 

 Phytoptocecidia, or Mite Galls, in the Cambridge Museum. Can. 

 Ent. 17:21], no general check list of our mite galls has been issued. 

 Cook in 1904 [Ind. Dep't Gcol. 2yth An. Rep't, p. 801] published 

 on the galls of Indiana, and Jarvis has recently [Ent. Soc. Ont. 

 37th & 38th An. Rep't, p. 56 and 92 respectively] listed the Canadian 

 forms, while Carman in 1892 [American Phytoptocecidii. Psyche, 

 6:241] described those known to him. Carman's careful paper 

 of 1883 [111. State Ent. 12th Rep't, p. 123], moreover, v^as not 

 seen by Hagen, and all of these papers with other scattering articles 

 contain additions to Hagen's list. Besides these, about 20 unmen- 

 tioned forms are known to tlie writer, bringing the total number of 

 American forms up to more than double what Hagen recorded. It 

 has seemed worth while, in view of the interest which must soon 

 center in this rather neglected family of mites, to put this list in 

 print as a guide and check for future work, though in so doing 

 its imperfections and temporary character are painfully evident. 

 Difficulty has been met in correlating various writers, as descrip- 

 tions from dry or preserved and from fresh specimens often differ 

 greatly. In a few cases recent writers appear to have misapplied 

 the names or descriptions of earlier authors, thus introducing con- 

 fusion. 



The present list is arranged alphabetically by host plants, using 

 Eritton and Brown's nomenclature. For convenience certain com- 

 mon types of leaf-galls will be referred to as follows: 



Type I .mmmm=. Erineum 



" II '^^^'^yu^i?^ Dimple 



" III =<^^>^ Capsule 



" IV ^r^fe Pocket -» (Cephaloneon 



V ^^^ . Pouch I of Hagen) 



II81 



