304 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



M. ribis (Linnaeus). Aphis ribis Linnaeus. 



Syst. Nat, Edn. 10, 451, 1758. 



Much confusion exists in the literature of this species. It is 

 usually present in the reddish puffy places commonly seen on 

 currant leaves. See Haviland (1919b). 



On currant, Norwalk, 20 June, 1901 ; Milford, etc., Norwalk, 20 June, 

 1901; Milford, 3 June, 1902; New Haven, i June, 1909; Canaan, 9 Jiine, 

 1909; Bridgeport, 31 May, 1910; Greenwich, 6 June, 1910; Hartford, 18 

 June, 1910; Watertown, 27 May, 191 1; Bridgeport, 10 June, 191 1; Derby, 

 3 June, 1912; Norwich, 22 June, 1912; Mount Carmel, 29 June, 1912; 

 Ridgefield, 31 May, 1913; Cos Cob, 8 July, 1913. 



M. rosarum (Kaltenbach). Aphis rosarum Kaltenbach. 



Men der Pflanz., loi, 1843. 



The synonymy of this species seems to be somewhat tangled. It 

 is figured by Patch (1914b). 



On rose, Simsbury, 18 Apr., 1905. (Eggs, hatching.) 

 M. violae (Pergande). Rhopalosiphum violae Pergande. 



Can. Ent, xxxii, 29, 1900. 



The gibbous frontal tubercle and prominent antennal segment I 

 have associated in this species with Mysus. It is at present ( 1920) 

 placed with a small group of aphids known as the Pentalonina 

 (Baker I9i9h). 



On violet, New Haven, 19 Feb., 1903. 



Phorodon Passerini. 



P. humuli (Schrank). Aphis humuli Schrank. Phorodon pruni 

 Scopoli. Hop Aphid. 



Fauna Boica, ii, no, 1801. 



This economic species on hop and plum appears many times in 

 literature. It is described and figured by Riley (1889). 



Macrosiphum Passerini. 



Key to Species* 



1. Species not developing exclusively on Compositae 2 



Species developing on Compositae either exclusively or for a part 



of the life cycle .•••.-.• ^9 



2. Apex of cornicle with distinct reticulated area (e. g., solanifolii) 3 

 Apex of cornicle imbricated (e. g., pisi) or indifferently character- 

 ized (e. g., pelargonii) 22 



3. Apterous female with iii closely imbricated throughout. Setae of 



iii very short and stubby carpinicolens 



Apterous female not exceptional in foregoing respect 4 



Species known only for Orchidaceae luteum 



4. Apterous female with base of vi nearer three times length of ii than 



two and one-half times length of ii and base of vi more than 2 

 times length of hind tarsus 5 



♦Tarsal measurements in this key include only second joint of tarsus 

 exclusive of claw. Unless otherwise stated alate form is indicated. 



