No. 34-] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 323 



and California show a very gradual gradation from one extreme 

 of size to another and also in the case of other characters. These 

 were taken on apple, haw, Amelanchier, Crataegus, Sorbus and 

 quince. All attempts to separate these by hosts, localities or by 

 structural characters have failed. Therefore, the writer considers 

 for the present, at least, that there is but one, very variable species 

 represented by this group. 



Rearing records and a thorough study of the variation within 

 each species will be required in order to determine the validity of 

 the species in question. 

 *P. approximatus Patch. 



Jour. Econ. Ent, 10, 418, 1917. 



On white ash, Hawleyville, 19 June, 1914 (W. E. B.). 

 P. imbricator (Fitch). Schizoneura imbricator Fitch. (Fig. 28, 



14.) 

 Homop. N. Y. St. Cab., 68, 1851. 

 In woolly colonies on Fagus. 



On beech, Norwich, 15 Sept., 1910 (E. J. S. Moore) ; Branford, 16 

 Sept., 1913 (A. F. Whiting). 



P. tessellata (Fitch). Schizoneura tessellata Fitch. Pemphigus 

 acerifolii Riley. (PI. viii, 4.) 



Homop. N. Y. St. Cab., 68, 1851. 



Migrates between Acer where it occurs on the ventral side of 

 leaf and Alnus where the secretions of flocculent white wax render 

 the colonies conspicuous upon the stem. For an outline of the 

 life cycle see Patch (1911). 



On cutleaf maple, Westville, 28 June, 1912 (J. K. L.) ; on maple, Derby, 

 28 June, 1915 (W. E. B.) ; on silver maple, Hartford, 17 July, 1905; on 

 sugar maple, Bethel, 24 June, 1913; on alder, Southbury, 5 June, 1903; on 

 cutleaf alder, New Canaan, 29 Sept., 1909 (A. I. B.) ; on Japanese maple, 

 North Haven, 2 July, 1909 (J. F. Barnard). 



P. venafuscus Patch. 



Ent. News, xx, 319, 1909. 



A dark winged species developing in flocculent colonies on 

 Fraxinus, Syringa and Forsythia and migrating to the roots of 

 Abies balsamea. 

 P. xylostei De Geer. (Fig. 28, 4.) 



Mem. des Ins., iii, 96, 1773. 



A flocculent species in colonies on twigs and in crumpled leaves 

 of Lonicera. For description and figures see Tullgren (1909). 

 For American record see Patch (1916b). 



Neoprociphilus Patch. 



Stem mother unknown. Apterous viviparous females with six- 

 jointed antennae. Joints iii, iv, v and vi subequal in length. Wax 



