No. 34-] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 279 



Combined length of base and unguis of vi about equal to half of the 



diameter of head across the eyes brevis 



4. Unguis of segment vi less than one-third of the length of base 



deducta 



E. betulae (Koch). Callipterus betulae Koch. 



Die Pflanz. Aph., 217, 1855. 



Hartford, 11 Sept., 1905 (C. N. Ruedlinger). 

 E. brevis Baker. 



Jour. Econ. Ent, 10, 426, 191 7. 

 E. deducta Baker. 



Jour. Econ, Ent., 10, 429, 1917. 

 E. mucida (Fitch). Callipterus mucidus Fitch. 



Nox. and Ben. Ins. N. Y., 3, 334, 1856. 



On black birch, New Haven, 8 July, 1909 (A. I. B.) ; on Betula popu- 

 lifolia, Rainbow, 12 Oct., 1909 (W. E. B.) ; 20 Oct., 1909 (W. O. Filley) ; 

 on black birch, New Haven, i July, 19 13 (L. B. R.). 



Monellia Oestlund. 



Cornicles present as mere rings. Antennae slender, of six seg- 

 ments ; sensoria oval or subcircular ; head broad ; prothorax 

 prominently separated. Fore wing with the media twice branched ; 

 hind wing with both media and cubitus present. Wings often 

 held flat upon the back in repose. Cauda knobbed, anal plate 

 bilobed. 



Forms living solitary upon the leaves, sometimes having the 

 power of leaping. Apterous forms rare. 



Key to Species. 



1. Costal margin of wing without broad band, though in some cases 



with the costal vein brown 2 



Costal margin of wing with a broad brown band extending beyond 

 the stigma costalis 



2. Abdomen with rows of dark brown spots ; unguis of segment vi of 



antennae longer than or about equal to base caryae 



Abdomen without such spots ; unguis of segment vi of antennae 

 considerably shorter than base caryella 



M. caryae (Monell). Callipterus caryae Monell. 



Bull. U. S. Geol. Geog. Surv. Terr., v, 31, 1879. 



On hickory, New Haven, 30 Aug., 1912 (W. E. B.). 

 M. caryella (Fitch). Aphis caryaella Fitch. 



Nox. and Ben. Ins. N. Y., i, 163, 1856. 

 M. costalis (Fitch). Aphis caryaella costalis Fitch. 



Nox. and Ben. Ins. N. Y., i, 165, 1856. 



On hickory leaves. New Haven, 27 June, 1910 (W. E. B.). 



Myzocallis Passerini. 



Cornicles truncate without usually a very distinct neck ; antennae 

 of six segments armed with a few bristles and with oval or sub- 



