No. 34-] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 277 



cornicle, distinctly knobbed and armed with long- lash-like hairs on 

 knobbed part. Body hairs near cauda and on front of head stiflF 

 and capitate. 



The apterous viviparous female has the body armed with capitate 

 hairs. Antennal segment iii has from fifteen to twenty circular 

 sensoria in a row which does not cover the proximal fifth or the 

 distal third of segment. 



Described from specimens taken at Orono, Maine, 1906-1918. 

 Cotype specimens in the U. S. Natural Museum, and at the Maine 

 Agricultural Experiment Station. 

 C. alni Baker. 



Proc. Ent. Soc. Wash., xviii, 188, 1916. 

 C. annulatus (Koch). Chaitophorus annulatus Koch. 



Die Pflanz. Aphiden, 7, 1854. 

 C. castaneae (Fitch). Callipterus castaneae Fitch. (Fig. 28, 9.) 



Nox. and Ben. Ins., 3, 471, 1856. 



On chestnut, New Haven, 7 July, 1909 (A. I. B.) ; 20 Aug., 1912 

 (W. E. B.) ; 27 June, 1914 (M. P. Z.). 

 C. betulella Walsh. 



Proc. Ent. Soc. Phila., i, 301, 1862. 

 C. castaneoides Baker. 



Proc. Ent. Soc. Wash., xviii, 187, 191 6. 

 C. betulaecolens (Fitch). Aphis betulaecolens Fitch. 



Homop. N. Y. St. Cab., 66, 185 1. 



On birch, New Haven, 23 June, 1919. 



Euceraphis Walker. 



Cornicles present, truncate. Antennae of six segments, long 

 and slender; armed with rather narrow sensoria usually near the 

 base of segment iii, the unguis of segment vi usually not much 

 longer than base, sensorium at base of unguis long and oval. 

 More or less distinct antennal tubercles present. Fore wing with 

 the media twice branched, hind wing with both media and cubitus 

 present. Cauda usually knobbed and rather large, anal plate 

 usually entire. Abdomen of the alate form often with distinct 

 wax producing glands. 



Forms very large and usually solitary in habit; sexes not very 

 different from the other forms. 



Key to Species. 



1. Tibiae not uniform black and without clear pores 2 



Tibiae uniform black and covered thickly with a large number of 



clear pores mucida 



2. Abdomen without dark patch and clear wax pore areas 3 



Abdomen with a large dark brown patch in which are clear wax 



pore areas betulae 



3. Combined length of base and unguis of vi about equal to or much 



more than the diameter of head across the eyes 4 



