No. 34-] HEMIPTERA OF CONNECTICUT! APHIDIDAE. 315 



Tribe TETRANEURINI (New Tribe). 



This tribe is composed of species which Hve in true galls pro- 

 duced on the leaves of the winter host. Summer hosts, grasses 

 and herbs so far as known. 



Stem mother with four-jointed antennae. Young of stem 

 mother all become winged. Third generation apterous. Wax 

 production not as highly developed as in the tribe Eriosomatini. 

 Wax pore plates similar to those of this tribe. Cornicles present 

 or wanting. Reduced to slightly raised rings. Antennae of alate 

 forms distinctly angular, six-jointed. Sexuals small, beakless; 

 female laying but one egg. This tribe appears to be a connecting 

 link between Eriosomatini and Pemphigini. 



Key to Genera. 



1. Hind wing with one diagonal 2 



Hind wing with two diagonals Gobiashia, p. 316 



2. Fore wing with M once forked Colopha, p. 316 



Fore wing with M simple Tetraneura, p. 315 



Tetraneura Hartig. 



This genus possesses some of the characters of both the genus 

 Eriosoma and the genus Pemphigus. 



The stem mother has four- jointed antennae. Wax pore plates 

 wanting or very weakly developed. Young of stem mother all 

 acquiring wings. Third generation apterous. 



Alate viviparous females with six- jointed antennae. Secondary 

 sensoria linear, transverse. At least antennal joints iii to v 

 annular. 



M of fore wing simple. Hind wing with media only present. 

 (Fig. 28, 6.) Wax pore plates composed of a central area sur- 

 rounded by a single row of facets. Cornicles present or absent. 

 Cauda short, broadly rounded. Sexuals small and beakless, with 

 four- jointed antennae. Females laying but one tgg. 



The species of this genus produce true galls upon the leaves of 

 the winter host. Summer generations live on the roots of grasses 

 so far as known. 



Key to Species. 



Joint V of antennae longer than iv, subequal to iii in length ulmisacculi 

 Joint V subequal to iv, shorter than iii graminis 



T. ulmisacculi Patch. 



Me. Agr. Expt. Sta., Bull. 181, 216, 1910. 



Producing an erect pedunculated gall on the dorsal side of leaf 

 of Ulmus montana, U. pubescens and U. campestris. An account 

 of this insect is given by Patch (1910a). This is close to T. ulmi 

 Geoffroy and may prove to be that species though the evidence is 

 somewhat conflicting. 



