3. Anterior legs fossorial; anterior tibiae at the apex with two to four divisions. Pronotum elongate, ovate, rounded behind. Female without ovipositor. Tribe 2. GRYLLOTALPIDES. (Fig. 206, front legs of _Gryllotalpa_; Fig. 208, _Cylindrodes kochi_.) 3′. Anterior legs formed for walking. Ovipositor of the female visible (either elongate or rudimentary). 4. Posterior tibiae biseriately serrate. Tribe 3. MYRMECOPHILIDES. 4′. Posterior tibiae biseriately spinose. Ovipositor straight. 5. Antennae short, thickish, almost thread-like. Facial scutellum exserted between antennae. Posterior tibiae dilated. Gen. _Myrmecophila_.[268] 5′. Antennae elongate, setaceous. Facial scutellum transverse, visible below the antennae. Tibiae slender. 6. Posterior tibiae armed with two strong spines, not serrate between the spines. Tribe 4. GRYLLIDES. (Fig. 204, _Gryllus domesticus_; Fig. 211, _Platyblemmus lusitanicus_.) 6′. Posterior tibiae slender, armed with slender spines, and serrate between them. Tribe 5. OECANTHIDES. 2′. Second joint of the tarsi depressed, heart-shaped. 3. Posterior tibiae not serrate, but biseriately spinose. 4. The spines on each side three and mobile; apical spurs on the inner side only two in number. Ovipositor short, curved. Tribe 6. TRIGONIDIIDES. 4′. The spines numerous, fixed. Ovipositor elongate, straight. Gen. _Stenogryllus_. 3′. Posterior tibiae serrate and spinose on each side, the apical spurs, as usual, three on each side. Ovipositor straight or curved. Tribe 7. ENEOPTERIDES. {341}CHAPTER XV NEUROPTERA—MALLOPHAGA—EMBIIDAE ORDER III. NEUROPTERA. _Imago with biting mouth; with two pairs of wings, the anterior as well as the posterior membranous, usually with extensive neuration, consisting of elongate nervures and either of short cross-nervules forming numerous cells or of a complex minute mesh-work. (One division, Mallophaga, consists entirely of wingless forms; in Termitidae some of the individuals of each generation become winged, but others do not: except in these cases adult wingless forms are few.) The metamorphosis differs in the several divisions._ [Illustration: FIG. 212.—_Osmylus chrysops_, New Forest.] The Neuroptera form a heterogeneous, though comparatively small, Order of Insects, including termites, stone-flies, dragon-flies, may-flies, caddis-flies, lace-wings, scorpion-flies, ant-lions, etc. Bird-lice are also included in Neuroptera, though they have no trace of wings. We treat the Order as composed of eleven distinct families, {342}and, as a matter of convenience, arrange them in five divisions:— 1. _Mallophaga_.—Permanently wingless Insects, living on the bodies of birds or mammals. (Development very imperfectly known.) Fam. 1. Mallophaga.