No. 34.] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 329 



Migrating between Hamamelis virginiana and Betula causing a 

 spiny gall on the twigs of the former and corrugating the leaves 

 of the latter. For life history and figures see Pergande (1901). 



On white birch, New Haven, 10 July, 1909 (A. I. B.) ; on cutleaf white 

 birch, New Haven, 8 June, 191 1 (W. E. B.) ; on birch, Killingly, 11 June, 

 191 5 (W. E. B.) ; on Hamamelis virginiana, New Haven, 27 Oct., 1915 

 (B. H. W.). 



Family CHERMESIDAE. 

 Chermes Linnaeus. 



Key to Species. 



1. Gall form on Picea 2 



Developing on trunk of Pinus strobus, covered with white secretion 



pinicorticis 



2. Gall well formed 3 



Presence causing a scraggly deformation of twig — not well formed 



gall. Winged form from gall ovipositing on Picea similis 



3. Large gall on Picea engelmanni introduced from the west ....cooleyi 



Gall terminal , 4 



Gall not terminal, pineapple-shaped 5 



4. Gall cone-like, gall leaves modified to thin scales. On Picea 



mariana and rubra. Winged form from gall ovipositing on 

 needles of Pinus strobus pinifoliae 



Gall small, compact, about one-half inch long; pink or pale green 

 when fresh. Gall leaves short. On Picea mariana and P. rubra. 



Winged form from gall ovipositing on Larix ... . . .strobilobius 



consolidatus 



Gall loose in structure, three-fourths to one and three-fourths 

 inches long. Gall leaves not much abbreviated. On Picea 

 mariana and P. rubra. Winged form from gall ovipositing on 

 Pinus strobus floccus 



5. Fore wing with anal vein not strongly curved ; hind wing with M 



directed distad. (Fig. 28, 8.) Winged form from gall oyi- 



. positing on Larix lariciatus 



Fore wing with anal vein strongly curved; hind wing withM not 



directed distad. Winged form from gall ovipositing on Picea abietis 



For descriptions and figures of these insects and their work the 

 reader is referred to Gillette (1907), Borner (1908), Patch 

 (1909b) and Cholodkovsky (1915). 

 C. abietis Linnaeus. Spruce gall aphid. (PL xi, 7.) 



Syst. Nat. Edn. 10, 454, 1758. 



Common "pineapple gall" of white and Norway spruce. 



New Haven, 10 Sept., 1903; 25 July, 1905, 5 July, 1906, 25 June, 1907, 

 5 Oct., 1909. Stamford, 3 Oct., 1903; Pomfret Center, 9, 15 June, 1904; 

 Bristol, 6 June, 1906; South Woodstock, 19 June, 1906; New London, 21 

 May, 1907, 21 June, 1911; Waterbury, 12 Apr., 1910; Orange, 7 June, 1910; 

 Niantic, 10 June, 1910, 11 July, 1910; New Canaan, 22 June, 1910, 1 Aug., 

 191 1, 9 July, 1912; Greenwich, 6 July, 1910, 13 June, 1913; South Man- 

 chester, 18 May, 1911; Yalesville, 10 Aug., 1911, 18 Sept., 1913; Milford, 

 11 Sept., 191 1 ; Glastonbury, 17 Sept., 1912; New Britain, 22 Mar., 1913; 

 Southington, 16 Apr., 1914; Norfolk, 12 June, 1915- 



