SUBFAMILY V. GRYLLINM3. 671 



three spines on each margin and with only two subapical spurs 



on inner side (Fig. 235, c.) II. HYGHONEMOBIUS, p. 688, 



ort. Spines of hind tibise stout, immovable; last joint of maxillary palpi 



not more than one-third longer than the one preceding; basal joint 



of hind tarsi serrate above on both margins; larger, length of body 



rarely under 14 mm. 



c. Ocelli arranged in a nearly transverse row; upper inner subapi- 

 cal spur of hind tibiae as long as the middle inner one; oviposi- 

 tor very short, scarcely visible. III. ANUROGRYXLUS, p. 690. 

 cc. Ocelli arranged in an obtuse triangle; upper inner spur of hind 

 tibia? shorter than the middle one; ovipositor at least half as 

 long as hind femora. 



d. Vertex between the antennas scarcely wider than basal joint of 

 antenna?; lower margin of lateral lobes very short, rounded 

 into both front and hind margins. TV. GRYLLOOKS, p. 692. 

 dd. Vertex between the antenna? twice or more as wide as basal 

 joint of antenna?; lower margin of lateral lobes elongate, 

 nearly straight. 



e. Hind tibia? not more than two-thirds the length of hind fe- 

 mora, armed above with four or five spines on each mar- 

 gin; fore tibia? in short-winged forms with a tympanum on 

 outer side only. V. MIOGRYLLVS, p. 693. 



ee. Hind tibia? three-fourths or more the length of hind femora, 

 armed above with five to eight spines on each margin; fore 

 tibia? with a tympanum on both outer and inner sides. 



VI. GRYLLUS, p. 696. 



I. NEMOBIUS Serville 1839, 345. (Gr., "a grove-dweller.") 



THE GROUND CRICKETS. 



Size small, form compact; body and legs sparsely clothed with 

 long bristle-like hairs; vertex rounded into the face; ocelli small, 

 round, arranged in a triangle; eyes oval, prominent; disk of prouo- 

 tmn snbqnadrate, but slightly wider than head ; lower margin of 

 lateral lobes horizontal, its front and hind angles rounded ; teg- 

 mina of male usually shorter than abdomen, their tips rounded or 

 subtruneate, the tympanum with but a single oblique ulnar vein ; 

 tegmina of female with a few prominent longitudinal veins and 

 numerous connecting cross-veinlets ; wings variable in length, of- 

 ten absent ; inner or hind face of fore tibire only with a tympanum ; 

 hind femora strongly swollen ; basal joint of hind tarsi not sulcate 

 above, armed only at apex with two small teeth and with a long- 

 spine on each side, the inner one the longer; cerci of both sexes 

 very slender, tapering, half the length of hind femora clothed with 

 short hairs and long bristles. Ovipositor variable as to species. 



Of all the Gryllidre which occur with us, these little brown 

 ground crickets of the genus Neiiiobiiis are the most numerous and 

 the most social. Unlike their larger cousins, the field crickets, 



