HEMIPTERA 359 



K. Tarsi furnished with an arolium. p. 375. 

 MiRIDiE 



KK. Tarsi without an aroHum. p. 377 



Termatophylid^ 



II. Ocelli present, p. 374 IsoMETOPlD^ 



HH. Hemelytra without a cuneus; membrane with 

 four or five simple or anastomosing veins aris- 

 ing from the base, or with a large number of 

 veins arising from a cross-vein at the base. 



I. Ocelli wanting. 



J. Exceedingly fiat bugs, p. 388 Aradid^e 



JJ. Rather stout and heavily formed bugs. p. 

 385 Pyrrhocorid^ 



II. Ocelli usually present. 



J. Head with a transverse incision in front of 

 the ocelli, which are always present (Fig. 

 449). p. 388 Neidid^ 



JJ. Head without transverse incision. 



K. Membrane with four or five simple veins 

 arising from the base of the membrane, 

 the two inner ones sometimes joined to 

 a cell near the base (Fig. 413). p. 386. 



Lyg^id^ 



KK. Membrane with many, usually forked 

 veins, springing from a transverse 

 basal vein (Fig. 414). p. 389. . . . 



CoREIDiE 



HHH. Hemelytra vestigial; parasitic bugs preying 

 on bats. p. 379 Polyctenid^ 



OD. Antennae five-jointed.* 



E . Hemelytra with the clavus similar in texture to the membrane, 

 which is without veins (Fig. 409) ; small semiaquatic bugs, 

 measuring less than 3 mm. in length (Hebrus). p. 372 



HEBRID.E 



EE. Hemelytra with the clavus markedly thicker than the 

 membrane. 



F. Tibiae armed with strong spines, p. 391 Cydnid^e 



FF. Tibiae smooth or with small spines. 



G. Scutellum narrowed behind, only rarely almost cover- 

 ing the abdomen, p. 390 Pentatomid^ 



GG. Scutellum not narrowed as in the Pentatomidae, 

 very convex, nearly or quite covering the ab- 

 domen, p. 392 SCUTELLERID/E 



*In some cases there are minute intermediate joints between the principal 

 joints of the antennae; for the purposes of this table these intermediate joints are 

 not counted. 



