No. 34-) HEMIPTERA OF CONNECTICUT: APHIDIDAE. 3II 



Mastopoda Oestlund. 



M. pteridis Oestlund. 



Aphid, Minn., 53, 1887. 



For description of this curious footless aphid on fern sec 

 Oestlund (1887) and for figures see Patch (1910b). 



Microparsus Patch. 



M. variabilis Patch. 



Ent. News, xx, 338, 1909. 



On account of the unstable venation the figure accompanying the 

 original description (Patch 1909c) was shown with M once 

 forked. A twice forked M seems on further acquaintance to be 

 typical and this genus, therefore, is given two places in the key. 

 Host plant is Desmodium canadense and the species is not 

 migratory. 



Subfamily Pemphiginae. 



By Asa Chandler Maxson. 



Key to Tribes. 



1. Subcosta of hind wing nearly straight. Not curving away from 



costa at base of diagonals 2 



Subcosta of hind wing curving away from costa before base of 

 first diagonal, then curvmg back toward it beyond base of second 

 more or less abruptly or in a long gradual curve 5 



2. Secondary sensoria transverse, linear. Antennae of alate forms 



usually distinctly annular ; six- jointed 3 



Secondary sensoria broadly oval to subcircular. Antennae of alate 

 forms not distinctly annular ; six- jointed 4 



3. Stem mother with five-jointed antennae. M of fore wing once 



forked. Hind wing with one or two diagonals Eriosomatini, p. 312 

 Stem mother with four- jointed antennae. M of fore wing once 



forked or simple. Hind wing with one or two diagonals 



Tetraneurini, p. 315 



4. Permanent sensoria with fringe of celia. Joint ii of antennae sub- 



equal to i. Rudimentary gonopophyses two Geoiciini, p. 318 



Permanent sensoria without fringe of celia. Joint ii of antennae 

 distinctly longer than i. Rudimentary gonopophyses wanting . . 



Trifidini, p. 318 



5. Subcosta of hind wing curving away from costa before base of first 



diagonal. Returning toward it in long gradual curve. Base of 

 second diagonal obsolete for short distance. Wax pore plates 

 composed of subcircular facets of irregular size, loosely arranged ; 



those of abdomen not surrounded by chitinous ring 



Melaphini, p. 317 

 Subcosta of hind wing curving away from costa before base of 

 first diagonal curving toward costa again just beyond base of 

 second diagonal. Base of second diagonal reach subcosta. Wax 

 pore plates composed of many several-sided facets of uniform 

 size closely arranged; those of abdomen surrounded by chitinous 

 ring Pemphigini, p. 319 



