1921] Wells — Neiv United States Zoocecidia il 



I am indebted to Mr. M. E. Ensign for this material. 

 Fig. 16, left, galls on stem base; right, included egg. 



Liatris. 

 Cecidomyia sp. Cecidimn no v. Fig. 17. 



17. On Liatris punctata Hook., bnd gall; kataplasma; sub- 

 globular, consisting of a mass of swollen and fused leaves, the ends 

 of some of them projecting distally from the gall, 5-10 mm. dia., 

 3-5 elongate larval chambers ; not common, Manhattan, Kan. 

 Tj'pes in collection of writer. 



Lobelia. 

 Cecidomyia sp. Cecidium nov. Fig. 18. 



18. On Lohelia piiherula Michx., stem swelling; kataplasma; 

 simple rather inconspicuous enlargement of stem, variable in length, 

 the maximum being about 10 cm., width varying from 4-5 mm., 

 surface same as normal stem except for presence of a few longi- 

 tudinal fissures in the epidermis exposing the cortical layer; inter- 

 nally the pith tissue contains a more or less broken, narrow cavity 

 occupied by the larvae which are distrilmted in a linear series; 

 all tissues of the stem are al)out equally involved in the hyperplasia. 

 Not uncommon, Ealeigh, N". C. Types in collection of the writer. 



I am indebted to Mr. I. V. Shunk for the original collection of 

 this material. 



Parthenium. 

 Eriophyes sp. Cecidium nov. Fig. 19. 



19. On Parthenium integrifolium L. ; leaf -blade gall; kata- 

 plasma, diverticulum type with trichomes (erineum) ; extremely 

 variable evaginations projecting either side of the leaf, the smaller 

 ones covered internally and exteriorly wdth a heavy layer of tomen- 

 tum made up of slender, twisted, multicellular trichomes, larger 

 pouches often nearly smooth on exterior. Rather infrequent. West 

 Raleigh, N. C. Types in author's collection. 



Fig. 19, left, affected leaf; right, two trichomes. 



Persea. 

 Aphid sp. Cecidiimi nov. Fig. 20. 



20. On Persea Borbonia (L) Spreng., leaf; kataplasma, leaf 



