HEMIPTERA 357 



The Lace-bugs, Family TiNGiDiE. p. 384. 

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

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

 The Stilt-bugs, Family Neidid^. p. 388. 

 The Flat-bugs, Family Aradid^. 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 



A. Antennae 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 



Notonectida;, 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 hemelytra without veins. p. 367..Naucorid^ 

 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; antennse exposed, p. 368. 



.Ochterid^ 



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 fovu- jointed, p. 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 RJiagovelia) ; beak three-jointed. 



P- 369 Veliid^ 



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

 apex. 

 D. Antennas four- jointed.* 



E. Hemelytra resembHng 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 antennas; for the purposes of this table, these intermediate joints 

 are not counted. 



