4 John June Davis 



1. Phylloxera caryae-caulis (Fitch). 



2. P. vitifoliae (Fitch) (P. vastatrix Planchon). 



3. Pemphigus alnifoliae WiUiams. 



" Pemphigus alnifoliae n. sp. No. 4. On Amelanchier alnifolia, 

 War Bonnet Cr., 6/21, '90." 



One winged viviparous female and several immature on the slide. 

 This appears to be quite distinct from P. corrugatans Sirrine. 

 It is a rather large species. Head half the width of the thorax. 

 Sensoria on antennal segments as follows: 18 to 20 on III, 5 or 

 6 on IV, 4 on V (also the usual one at the distal end). Draw- 

 ings of the head, antenna, and wing of the winged viviparous 

 female are shown on Plate I, figs, i and 2. 



I have received this species from Dr. Edith M. Patch, collected 

 on Amelanchier, and from Prof. C. P. Gillette who collected it on 

 Amelanchier and Crataegus. 



4. P. balsamiferae Williams. 



" Pemphigus balsamiferae n. sp. No. 5. On Populus balsamif- 

 era, Squaw Cr., June 24, 1890." 



Five winged, one stem-mother and several pupae on the slide. 

 This appears to be a good species. The gall as described by 

 Williams agrees well with those of a new species of Pemphigus 

 taken by the writer on balsam poplar at Chicago, Illinois, but the 

 specimens differ by having no sensoria on segment VI. Beak 

 reaches a little beyond the coxae of the first pair of legs. Meas- 

 urements as follows: length of body, 1.89 mm; width, 0.69 mm; 

 antenna, 0.73 mm; length of fore wing, 2.55 mm; width, 0.95 

 mm. Camera lucida drawings of the antenna, and fore and hind 

 wings are given in Plate I, figs. 3 and 4. 



5. P. fraxinifolii Riley. 



6. P. populicaulis Fitch. 



7. P. populi-monilis Riley. 



8. P. populi-transversus Riley. 



9. P. rhois Fitch. 



10. P. tesselata (Fitch). 



11. Mordwilkoja oestlundi (Cockerell) {Pemphigus vagahundus Walsh). 



12. Pemphigus walshii Williams. 



Unfortunately no specimens of this species were preserved, so 



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