248 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BulL 



Genital segment of female at least nearly as long as rest of abdo- 

 men hartigii 



4. Dorsal plate of female cauda not with bulb-shaped nodules; if 



cuticular processes are present they are of some other shape 5 



Dorsal plate of female cauda with lower margin thickly set with 

 bulb-shaped nodules buxi 



5. Genital segment of female shorter than rest of abdomen 6 



Genital segment of female at least as long as rest of abdomen . . striata 



6. Antenna conspicuously annulated with black annulata 



Antenna imif ormly yellowish, except terminal segment black 



negundinis 



7. Dorsal plate of female without dark nodules 8 



Dorsal plate of female cauda armed with large blunt dark cuticular 



processes which give it a decidedly noduled appearance cerasi 



8. Dorsal plate of female not rounded at tip 9 



Dorsal plate of female gently rounded at tip galeaf ormis 



9. Dorsal plate of female tapering to point at tip carpinicola 



Dorsal plate of female cauda abruptly tilted up at tip floccosa 



P. pyricola Foerster. Pear psylla. (PL vi, 2.) 



Verh. Natw. Ver. Preuss. Rheinl, v, ^7, 1848. 



Of economic importance, causing considerable injury to the pear 

 crop. Nymphal stages passed on pear leaves. Common through- 

 out the State. 



Hartford, 7 July, 1903; Portland, 14 July, 1903; New Haven, 16 July, 

 1903; 16 Oct., 1903 (H. L. V.) ; 13 July, 1914 (M. P. Z.) ; Hamden, 18 

 July, 1903; West Granby, 4 Aug., 1903; Woodbury, 6 Aug., 1903; South 

 Windsor, 8 Oct., 1903; Cheshire, 17 February, 1904; Wolcott, 18 April, 

 1904; Hartford, 15 June, 1904; Berlin, 2.2. Nov., 1905 (W. E. B.) ; Guilford, 

 I Aug., 1906; New Britain, 4 Oct., 1910; Mystic, 12 Aug., 1912; Cheshire, 

 28 July, 1914, 27 Aug., 1915. 



Fig. 24. Wing of Psylla striata Patch. Greatly enlarged. Drawing by 

 Dr. Edith M. Patch. 



P. hartigii Flor. 



Rhyn. Livl., ii, 469, 1861. 



Nymphal stages passed on birch (Betula). The caudal segment 

 of female is much like galeaf ormis except for the constant down- 

 ward curve of the long dorsal plate. Crawford (19 14) and Patch 

 (1912). 



