106 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
KEY TO THE GENERA OF ASOPINAE 
a. Front femora armed beneath at apical third or fourth with 
a. short spine. 
b. Seutellum broad, U-shaped____Stiretrus (p. 114). 
bb. Scutellum triangular, apex narrowed 
Pertllus (p. 114). 
aa. Front femora without spine. 
ce. Larger, 14 or more mm. (%¢@ inch); cheeks slightly 
longer than middle lobe___Apateticus (p. 114). 
ce. Smaller, less than 12 mm. (1% inch); cheeks equaling 
middle lobe sss weeas = ae eenr Podisus (p. 114). 
5 (2). Forewing with a cuneus (triangular section of forewing forming 
the outer apical part of the leathery portion) ____ 
Leathery portion of forewing entire, withcut any transverse 
AINGISVOM SC CCL OO ft eed CUT UI Se ees 
6 (5). Beak 4-segmented; membranous portion of forewing with 2 small 
cellseyrarely al; at: bases 2 ses se me eee Miridae (p. 118). 
Beak 3-segmented; membranous portion of forewing without cells 
OPGAD PATTEM tr Wiese au See Anthocoridae (p. 118). 
7 (5). Beak robust, curved, apex normally resting in a groove located 
between and in front of the forelegs. _____-Reduviidae (p. 117) 
Beak slender, without evidence of a groove between and in front 
ofsthe forelegs... 4.202 55 Se Us Se chon Sn aS he Oe eee 
8 (7). Tarsi 2-segmented: body flattened both above and below_____-_- 
Tarsi 3-segmented; body convex at least below_______________-_ 
9 (8). Forewings not lacelike (normally living under bark) 
Aradidae (p. 118). 
Forewings lacelike, having a network of veins enclosing 
MEMIDTAMOUSHALCAG = are oye ey ee eee aye ae Tingidae (p. 115). 
KEY TO THE GENERA OF TINGIDAE 
a. Side margins of pronotal expansions and of outer margins 
of the forewings usually furnished with a fringe of small 
spines; lateral margins of forewings when at rest parallel 
or slightly converging apically_____ Corythucha (p. 115). 
aa. Side margins of pronotal expansions and outer margins of 
the forewings without spinules; outer margins of the 
forewings convexly rounded, never parallel 
Stephanitis (p. 117). 
10 (8). First segment of the beak short, thick; front femora larger than 
middle or hind femora; front femora and tibia set beneath with 
numerous fine setae (predaceous)_______-_- Nabidae (p. 118). 
First segment of the beak slender, nearly as long as head; femora 
and tibia usually not adapted for grasping prey___________-_~- 
11 (10). Membranous portion of forewing with many veins (more than 8) 
Coreidae (p. 118). 
Membranous portion of forewing with not more than 4 to 6 veins 
Lygaeidae (p. 119). 
KEY TO THE FAMILIES OF HOMOPTERA 
iL. Beak arising at a point between or behind the base of the front legs_ 
Beak clearly arising from the lower margin of the face________- 
2 (1). Tarsi 1l-segmented, with 1 apical claw; females wingless and 
usually remaining fixed to the host plant throughout. life, 
sealelike or covered with a scale; males usually with 1 pair of 
Wi O'S oe aaa ink ek A Saye Superfamily Coccoidea (scale insects). 
Tarsi 2-segmented, with 2 apical claws. Wings, when present, 
usually 4 in number. Usually active species22==-— = See 
3 (2). Hind femora enlarged for jumping 
Psyllidae (jumping plant lice). 
Hind femora: notienlaraced): Ps sspears re eee ea ee ae ee 
4 (3). Legs short, tarsal segments equal in size; wings usually opaque, 
whitish, frequently marked with bands or spots 
Aleyrodidae (whiteflies). 
Legs long and slender, basal segment of tarsus often short; wings 
usually transparent; cornicles usually present 
Superfamily Aphoidea (plant lice). 
11 
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