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



Tribe ERIOSOMATINI. 



The species of this tribe live in curled leaves, exposed on the 

 twigs or on the roots of the host which is always a tree or shrub. 



Stem mother with five-jointed antennae. Young of stem 

 mother apterous. Third generation alate. Wax production 

 highly developed. Wax pore plates usually composed of a single 

 row of facets surrounding a central area which may or may not 

 be faceted. Cornicles present; reduced to slightly raised rings. 

 Antennae of alate forms usually distinctly annular; six-jointed. 

 Sexes small, beakless ; females laying but one egg. 



Key to Genera. 



Hind wing with two diagonals. Secondary sensoria nearly encir- 

 cling antennae Eriosoma, p. 312 



Hind wing with one diagonal. Secondary sensoria not encircling 

 antennae to any extent Georgia, p. 314 



Eriosoma Leach. 



Stem mother with five- jointed antennae. Wax pore plates con- 

 sist of irregularly shaped areas composed of many, several-sided 

 facets. Plates not bordered by chitinous ring. Young of stem 

 mother all apterous. 



Third generation alate. Antennae six- jointed. Secondary sen- 

 soria narrowly linear, transverse. At least joints iii and iv 

 distinctly annular. 



M of fore wing once forked. Hind wing with both media and 

 cubitus present. Cornicles present; reduced to slightly raised 

 rings. Cauda short, broadly rounded. 



Wax pore plates of all except stem mother composed of a central 

 area surrounded by a single row of rather large facets. Sexuals 

 small and beakless, antennae five- jointed. Female laying but one 



egg- 



Species living in curled leaves, on bark and twigs or on roots 



of host plants. 



Key to Species. 



1. Combined length of antennal joints iv, v and vi about equal to or 



less than that of iii 2 



Combined length of antennal joints iv, v and vi greater than that of 



iii americanum 



(Fundatrigenia) 



2. Joints v with annulations, vi with or without annulations 3 



Joints v and vi of antennae without annulations ulmi 



(Fundatrigenia) 



3. Fifth joint of antennae with from four to nine annulations 4 



Fifth joint of antennae with from three to four annulations . .pyricola 



(Sexuparae) 



4. VI normally without annulations 5 



VI normally with annulations 6 



