ReduviidcB of the United States 281 



pair of wings, when present, of uniform thickness. Cicadas, scale 



insects, plant lice (Aphids), spittle-insects, leaf hoppers, etc 



HOMOPTERA 



REDUVlIDiE OF THE UNITED STATES 



(Adapted from a key given by Fracker). 

 a. Ocelli none; wings and hemelytra always present in the adults; no discodial 

 areole in the corium near the apex of the clavus. Orihometrops decorata, 



Oncerotrachelus acuminatus, etc., Pennsylvania and south Sarcince 



aa. Ocelli present in the winged individuals; anterior coxce not as long as the 

 femora, 

 b. Hemelytra without a quadrangular or discoidal areole in the corium near 

 the apex of the clavus. 

 c. Ocelli not farther cephalad than the caudal margins of the eyes; segment 

 two of the antenna single, 

 d. Thorax usually constricted caudad of the middle; anterior cox£e ex- 

 ternally flat or concave PlRATlN.ffi; 



e. Middle tibiae without spongy fossa, head long, no lateral tubercle 



on neck. S. stria, Carolina, 111., Cal Sirthenia Spinola 



ee. Middle tibiae with spongy fossa; fore tibias convex above; neck 

 with a small tubercle on each side. 

 f. Apical portion of anterior tibias angularly dilated beneath, the 



spongy fossa being preceded by a small prominence 



Melanolestes Stal 



g. Black, with piceous legs and antennae. N. E. States (fig. 19a) 



M. picipes 



gg. Sides, and sometimes the whole dorsal surface of the abdomen 



red. 111., and southward M. abdominalis 



ff. Tibiffi not dilated as in "f"; spongy fossa elongate; metapleural 

 sulci close to the margin. R. biguttatus (fig. 22). South 



Rasahus A. and S. 



dd. Thorax constricted in the middle or cephalad of the middle; anterior 

 tarsi each three-segmented. 

 e. Apex of the scutellum narrow, without spines or with a single spine 



REDTJvnN.«; 



f . Antennae inserted in the lateral or dorso-lateral margins of the head; 



antenniferous tubercles slightly projecting from the sides of the 



head; head produced strongly cephalad; ocelli at least as far 



apart as the eyes. 



g. Antennas inserted very near the apex of the head; segments 



one and three of the beak short, segment two nearly four 



times as long as segment one. R. prolixus. W. I 



Rhodnius Stal 



gg. Antenna inserted remote from the vertex of the head. 



h. Body slightly hairy; pronotum distinctly constricted; angles 

 distinct; anterior lobe four-tuberculate, with the middle 

 tubercles large and conical. M. phyllosoma, large species 

 the southwest Meccus Stal 



