2So 
Hominoxious Arthropods 
ii. Posterior coxa; rotating. 
j. Claws preapical; aquatic forms. Gerrid® and Veliad® 
jj. Claws apical. 
k. Prosternum without stridulatory sulcus (notch for 
beak). 
I. Tarsus with three segments; membrane with two or 
three longitudinal cells from which veins radiate; 
rarely with free longitudinal veins (Arachnocoris) 
or veins nearly obsolete (Arbela); clavus and 
corium coriaceous; ocelli rarely absent. . Nabid® 
Reduviolus ( = Coriscus) subcoleoptratus (fig. 19 g), 
a species belonging to this family, occurring in 
the United States, has been accused of biting 
man. This insect is flat, of a jet black color, 
bordered with yellow on the sides of the abdomen, 
and with yellowish legs. It is predaceous, 
feeding on other insects. 
II. With other combinations of characters. Hydro- 
METRID®, HENICOCEPHALID®, N®OGEID®, MESO- 
VELIAD®, JOPPEICID® 
kk. Prosternum with stridulatory sulcus (notch for beak); 
with three segments, short, strong. 
I. Antennae filiform or sometimes more slender apically, 
geniculate; wing membrane with two or three 
large basal cells; scutellum small or moderate 
.REDUVIID® 
For a key to the genera and species see next page. 
II. Last antennal segment claVhte or fusiform; wing 
membrane with the veins often forked and ana¬ 
stomosing; scutellum large; tarsi each with two 
segments; fore legs strong. ( = Phy t matid®) 
. Macrocephalid.e 
ee. Clavus noticeably narrowed towards the apex, never extending 
beyond the scutellum, the two not meeting to form a commissure; 
head horizontal, much prolonged between the antennse, on each 
side with an antennal tubercle, sometimes acute; ocelli absent; 
meso- and metasternum simple; tarsi each with two segments; 
body flattened (fig. 19c). Aradid®, including Dysodiid®. 
dd. Pulvilli present (absent in one Australian family THAuM atocorid ® 
in which case there is a membranous appendage at the tip of the 
tibia). Capsid.® ( = Mirid®),* Eotrechus (in family Gerrid®), 
N®ogaid®, Tingitid®, Piesmid®, Myodochid®, Corizid®, 
Coreid®, Alydid®, Pentatomid®, Scutellerid®, etc. 
bb. Apex of head directed ventrally, beak arising from the hinder part of the 
lower side of the head; sides of face contiguous to the front coxae; first 
*Professor C. R. Crosby who has been working upon certain capsids states that he and his 
assistant have been bitten by Lygus pratensis, the tarnished plant bug, by Chlamydatus associatus 
and by Orthotylus flavosparsus, though without serious results. 
