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) ll. Body clothed with rather longer silky hairs; third and fourth segments of the antenna somewhat more slender than the first and second; anterior margin of the pronotum _very slightly sinuate_ or nearly straight in the middle, produced at the lateral angles. This is the species which in American collections is known as _C. hirundinis_, the latter being an old world form. It is found in swallows nests. O. VICARIUS. OECIACUS Stäl kk. Beak long, reaching to the posterior coxæ; scutellum rounded at the apex; lateral margins of the elytra strongly reflexed, apical margin slightly sinuate toward the middle; intermediate and posterior coxæ sub-contiguous. This species infests poultry in southwest United States and in Mexico. H. INODORUS. HÆMATOSIPHON Champ. [Illustration: 160. Pselliopsis (Milyas) cinctus (×2). After C. V. Riley.] jj. Ocelli present, if rarely absent in the female, then the tarsus has two segments; or if with three tarsal segments, the wing membrane with one or two cells. k. Beak four-segmented, or with two-segmented tarsi. ISOMETOPIDÆ, MICROPHYSIDÆ, and some CAPSIDÆ. kk. Beak three-segmented.