358 AN INTRODUCTION TO ENTOMOLOGY 



F. Beak three-jointed. 

 G. Hemelytra when well-developed with an emboLam (Fig. 

 408); those forms in which the adult has vestigial 

 hemelytra have no ocelli. 

 H. Hemelytra vestigial; parasitic bugs preying on man, 



bats, and birds, p. 378 Cimicid.^ 



HH. Hemelytra usually well developed; not parasitic 



bugs. p. 377 Anthocorid^ 



GG. Hemelytra when well developed without an embolium; 

 those forms in which the adult has vestigial hemely- 

 tra have ocelli. 

 H. Ocelli wanting. 



I. Body greatly flattened, p. 388 Aradid^ 



II. Body not greatly flattened, p. 38o..Reduviid^ 

 HH. Ocelli present, though sometimes difficult to see. 



I. Antennas whip-like, the first two segments 



short and thick, the third and fourth long and 

 very slender and clothed with long hairs, the 

 third segment thickened towards the base. 

 J. Head when viewed from above wider than long, 

 strongly deflexed; beak short, p. 373. 



SCHIZOPTERID^ 



JJ. Head extended horizontally or slightly de- 

 flexed; beak long. p. 374. . . Dipsocorid^ 



II. Antennae not of the form described above. 



J. Beak long, reaching to or beyond the inter- 

 mediate coxag. 

 K. Membrane of hemelytra with looped veins. 



p. 369 Saldid^e 



KK. Alembrane of hemelytra without veins. 



L. Hemelytra with the clavus similar in 



texture to the membrane (Fig. 409). 



p. 372 Hebrid^ 



LL. Clavus and membrane distinct, p. 



372 Mesoveliid^ 



JJ. Beak not reaching the intermediate coxae. 

 K. Front legs with greatly thickened fem- 

 ora, p. 382 Phymatid^ 



KK. Front femora somewhat thickened, 

 but much less than half as wide as 



long. p. 380 Reduviid^ 



'3F. Beak four-jointed. 



G. Front legs fitted for grasping prey. 



H. The fore tarsi, which are one-jointed, capable of be- 

 ing closed upon the end of the broad tibice. p. 383. 



Enicocephalid^ 



HH. The fore tibiae armed with spines andcpable of 

 being closed tightly upon the femora, wahich are 

 stout. In the forms with long wings the mem- 

 brane is usually furnished with four long veins 

 bounding three discal cells which are often open. 

 From these cells diverge veins which form sev- 

 eral marginal cells (Fig. 410). p. 380..NABID.E 

 GG. Front legs fitted for walking. 



H. Hemelytra with a cuneus; membrane with one or 

 two closed cells at its base, otherwise without 

 veins (Fig. 411). 

 I. Ocelli wanting. 

 J. Membrane of the hemelytra with two closed 



cells, p. 375 MiRiD.E 



JJ. Membrane with only one closed cell. 



