HEMIPTERA 357 



The Lace-bugs, Family Tingid^. p. 384. 

 The Cotton-stainer Family, Family Pyrrhocorid^. p. 385. 

 The Chinch-bug Family, Family Lyg^id^. p. 386. 

 The Stilt-bugs, Family NeididJe. p. 388. 

 The Flat-bugs, Family Aradid.e. p. 388. 

 The Squash-bug Family, Family Coreid^. p. 389. 

 The Land-bugs with five-jointed antennce. 



The Stink-bug Family, Family Pentatomid^. p. 390. 



The Burrower-bugs and the Negro-bugs, Family Cydnid^. p. 391. 



The Shield-backed-bugs, Family Scutellerid^. p. 392. 



TABLE FOR SEPARATING THE FAMILIES OF THE HEMIPTERA 



h.. Antenna shorter than the head, and nearly or quite concealed in a cavity 



beneath the eyes. 



B. Hind tarsi with indistinct setiform claws (except in Plea, of the family 



Notonectidse, which is less than 3 mm. in length). 



C. Fore tarsi consisting of one segment, which is flattened or shovel-shaped, 



and without claws; head overlapping the prothorax dorsally. p. 360. 



CORIXID^ 



CC. Fore tarsi of the usual form, and with two claws; head inserted in the 



prothorax. p. 362 Notonectid^ 



BB. Hind tarsi with distinct claws. 



C. Ocelli absent; bugs that live within water. 



D. Membrane of the hemelytra with distinct veins. 



E. Caudal appendages of the abdomen long and slender; tarsi one- 

 segmented, p. 364 Nepid^ 



EE. Caudal appendages of the abdomen short, flat, and retractile; 



tarsi two-segmented, p. 365 Belostomatid^ 



DD. Membrane of the hemel}i;ra without veins. p. 367..NAucoRiDiE 

 CC. Ocelli present ; bugs that live on shores of streams and ponds. 



D. Fore legs stout, fitted for grasping; antennae concealed, p. 368. 



Gelastocorid^ 



DD. Fore legs slender, fitted for running; antennae exposed, p. 368. 



OCHTERIDiE 



AA. Antennae at least as long as the head, usually free, rarely (P hymatidae) 

 fitting in a groove under the lateral margin of the pronotum. 

 B. Body linear; head as long as the three thoracic segments, p. 373. 



Hydrometrid^ 



BB. Body of various forms, but, when linear, with the head shorter than the 



thorax. 



C. Last segment of the tarsi more or less split, and with the claws of at 



least the front tarsi inserted before the apex. 



D. Hind femora extending much beyond the apex of the abdomen; 



intermediate and hind pairs of legs approximated, very distant 



from the front pair; beak four-jointed, v. 370 Gerrid^ 



DD. Hind femora not extending much beyond the apex of the ab- 

 domen ; intermediate pair of legs about equidistant from front 

 and hind pairs (except in Rhagovelia) ; beak three-jointed. 



p. 369 VeliidvE 



CC. Last segment of the tarsi entire, and with the claws inserted at the 

 apex. 

 D. Antennse four- jointed.* 



E. Hemelytra resembling network, and very rarely with any dis- 

 tinction between the corium and the membrane, p. 384. 



TlNGID^ 



EE. Hemelytra of various forms or absent, but not of the form 

 presented by the Tingidae. 



*In certain families there are minute intermediate joints between the principal 

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

 are not. counted. 



