278 Hominoxious Arthropods 



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; hemelytra 



always short, membrane wanting. Species parasitic. 



Bed bugs, etc ClMIcrD.ffi 



k. Beak short, reaching to about the anterior coxae; 

 scuteUum acuminate at the apex; lateral margin of 

 the elytra but little reflexed, apical margin more or 

 less rounded; intermediate and posterior coxas 

 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 rotmded towards the 



interior angle. The common bed bug (fig. 



igh) 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 scuteUum, apical margin 

 rounded towards the exterior angle. Species 

 found on bats in various parts of the United 



States C. pillosellus Ho v. 



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) 



