Hominoxious A rthropods 
hh. Third segment of the antenna not thickened at the base, 
second as long or longer than the third, rarely shorter, 
i. Posterior coxae hinged (cardinate), if rarely rotating, the 
cuneus is severed, the membrane is one or two-celled, 
and the meso- and metastemum are composite, 
j. Ocelli absent, clypeus dilated toward the apex; hemelvtra 
always short, membrane wanting. Species parasitic. 
Bed bugs, etc. ClMlClDiE 
k. Beak short, reaching to about the anterior coxae; 
scutellum acuminate at the apex; lateral margin of 
the elytra but little reflexed, apical margin more or 
less rounded; intermediate and posterior coxae 
very remote. 
1 . Body covered with short hairs, only the sides of the 
pronotum and the hemelytra fringed with longer 
hairs; antennae with the third and fourth seg¬ 
ments very much more slender than the first and 
second; pronotum with the anterior margin very 
deeply sinuate .Cimex L. 
m. Sides of the pronotum widely dilated, broader 
than the breadth of one eye, and densely 
fringed with backward curved hairs; apical 
margin of the hemelytra nearly straight, rounded 
toward the interior or exterior angles, 
n. Body covered with very short hairs; second 
segment of the antenna shorter than the third; 
sides of the pronotum feebly reflexed, fringed 
with shorter hairs than the breadth of one 
eye; hemelytra with the commissural (inner) 
margin rounded and shorter than the scutel¬ 
lum, apical margin rounded towards the 
interior angle. The common bed bug (fig. 
19I1).C. lectularius Linn 
nn. Body covered with longer hairs; second and 
third segments of the antenna of equal 
length; side of the pronotum narrowly, but 
distinctly, reflexed, fringed with longer 
hairs than the breadth of one eye; hemelytra 
with the commissural margin straight and 
longer than the scutellum, apical margin 
rounded towards the exterior angle. Species 
found on bats in various parts of the United 
States. C. pillosellus Hov. 
mm. Sides of the pronotum neither dilated, nor 
reflexed, fringed with less dense and nearly 
straight hairs; hemelytra with the apical 
margin distinctly rounded. Parasitic on 
man, birds and bats. Occurs in the old 
world, Brazil and the West Indies .. . 
. C. hemipterus Fabr. ( = rotundatus) 
