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Table of Families — Part 1

(For the grater part of this table, which, however, has been rearranged, the writer is indebted to H. E. Summers' Bull. 3, Vol. iv, Agric. Expt. Station of the Univ. Tenn., 1891).

Antennae shorter than the head and nearly or quite concealed in a cavity beneath the eyes . . . . . 1

Antennae at least as long as the head, usually free, rarely (in Phymatidae) lying in a groove along the side of the pronotum . . . . . 4

1--Hind tarsi without claws . . . . . 2

Hind tarsi with two claws . . . . . 3

2--Fore tarsi flattened, ciliated on edge, without claws; head overlapping prothorax . . . . . Corixidae

Fore tarsi not flattened, with two claws; head inserted into prothorax . . . . . Notonectidae

3--Abdomen with two grooved filaments at tip, forming together a respiratory tube which is not retractile, Nepidae Abdomen without respiratory tube.

Legs formed for swimming; tip of abdomen with two retractile strap-like appendages . . . . . Belostomatidae

Legs formed for walking; abdomen with no such appendages.

Ocelli absent . . . . . Naucoridae

Ocelli present . . . . . Galgulidae

4--Antennae with their bases visible from above, usually fourjointed; rarely five-jointed, (not counting the minute intermediate segments sometimes present.)

Scutellum less than half as long as abdomen . . . . . 5

Antennae with their bases not visible from above, five-jointed.

Scutellum more than half as long as abdomen . . . . . 14

5--Beak three-jointed, sometimes four-jointed, with basal segment very short and inconspicuous . . . . . 6

Beak four-jointed, with plain basal segment . . . . . 10

6--Body very slender; head as long as thorax . . . . . Hydrometridae

Body of various shapes, but when slender, head shorter than thorax.

Last segment of tarsi more or less bifid, with the claws inserted before the tip . . . . . Hydrobatidae

Last segment of tarsi entire, claws at tip.

Hemelytra usually well developed and without cuneus.

When Hemelytra is absent ocelli are present . . . . . 7

Hemelytra with cuneus . . . . . Anthocoridae

Hemelytra rudimentary, ocelli absent . . . . . Cimicidae

7--Hind tarsi with three segments . . . . . 8

Hind tarsi with two segments . . . . . 9

8--Beak long and slender . . . . . Saldidae

Beak short and stout.

Head globulous behind the eyes . . . . . Henicocephalidae

Head not so formed . . . . . Reduviidae

9--Ocelli present. Fore-thighs greatly widened . . . . . Phymatidae

Ocelli absent. Fore-thighs not greatly widened.

Hemelytra shorter than abdomen . . . . . Aradidae

Hemelytra longer than abdomen . . . . . Tingitidae

10--Hemelytra without cuneus. Membrane with longitudinal veins which are sometimes indistinct . . . . .11

Hemelytra with cuneus. Membrane with one or two cells at base, but otherwise veinless . . . . . Capsidae

11--Membrane either with four or five simple longitudinal veins, in which case ocelli are usually present, or with about eight forked veins, in which case ocelli are absent . . . . .12

Membrane with many, usually forked, longitudinal veins which are sometimes difficult to see . . . . . Coreidae

12--Membrane with four or five simple longitudinal veins . . . . .13

Membrane with about eight forked longitudinal veins. Ocelli lacking . . . . . Pyrrhocoridae

13--Head with transverse incision in front of ocelli which are always present . . . . . Berytidae

Head without transverse incision. Ocelli usually present, rarely lacking . . . . . Lygoeidae.

14--Five-jointed antennae with hidden bases. Scutellum more than half the length of the abdomen, sometimes flat, sometimes very convex and covering nearly the whole abdomen . . . . . Pentatomidae.