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IOWA ACADEMY OF SCIENCE 
DD. Anterior femora with a double row of spines; anterior tibiae with 
three long spines 4. TAGALIS 
AA. Ocelli present in winged individuals. 
B. Anterior coxae nearly as long as femora, four times as long as wide; 
anterior femora with a row of spines beneath; membrane with single 
closed areole. Bactrodiiiae 1. BACTRODES 
BB. Anterior coxae short. 
C. Hemelytra without a quadrangular or discoidal areole at the proximo- 
anal angle of the anal areole of the membrane. 
D. Ocelli not farther cephalad than the caudal margins of the eyes; 
joint 2 of antennae simple. 
E. Thorax usually constricted caudad of middle; anterior coxae 
externally flat or concave. Piratinae. 
F. Middle tibiae without spongy fossa; head long; no lateral 
tubercles on neck 2 8. SIRTHENIA 
FF. Middle tibiae with spongy fossa; fore tibiae convex above. 
G. Neck destitute of lateral tubercles; head constricted im- 
mediately behind eyes 24. THYMBREUS 
GG. Neck with a small tubercle on each side. 
H. Cephalic half of pronotum without oblique sulci; meta- 
pleural sulci distant from margin; apical spongy part of 
anterior tibiae produced into a lamina more than one- 
fourth the length of the tarsi 25. TYDIDES 
HH. Cephalic half of pronotum with oblique sulci; lamina of 
anterior tibiae short. 
I. Apical portion of anterior tibiae angularly dilated be- 
neath, the spongy fossa being preceded by a small prom- 
inence 2 6. MELANOLESTES 
II. Tibiae not dilated as in I; spongy fossa elongate; meta- 
pleural sulci close to margin ..27. RASAHUS 
EE. Thorax constricted in the middle or cephalad of the middle; 
anterior tarsi three jointed. 
F. Apex of scutellum narrow, without spines or with a single 
spine. Reduviinae. 
G. Antennae inserted in lateral or dorso-lateral margins of 
head; antenniierous tubercles slightly projecting from sides 
of head; head produced strongly cephalad. 
H. Ocelli at least as far apart as the eyes. 
I. Antennae inserted very near apex of head; joints 1 and 
3 of rostrum short, joint 2 nearly four times as long 
as joint 1 23. RHODNIUS 
II. Insertion of antennae various, remote from apex of 
head, sometimes nearly as close to eyes as to apex of 
head. 
J. Body slightly hairy; pronotum distinctly constricted, 
angles distinct; anterior lobe quadrituberculate with 
the middle tubercles large and conical. .22. MECCUS 
JJ. Body glabrous, margins of pronotum sinuous, 
scarcely constricted; anterior lobe lined with little 
tubercles 21. CONORHINUS 
