The Nyctiborinae form the third division in the classification of the Blattidae.

Characters. -- Antennae setaceous or plumose and incrassated. Head with the vertex exposed. Tegmina coriaceous and together with the pronotum generally covered with a fine silky pubescence, which in the larvae extends over the whole body. Tegmina in all but one genus extending beyond the apex of the abdomen. Wings with anterior portion very large, costal veins somewhat irregular and ramose, ulnar vein multiramose, some of the rami incomplete and failing to reach the apex of the wing. Supra-anal lamina produced, triangular, its apex frequently incised slightly; sub-genital lamina of male narrow, slightly asymmetrical and with two styles, of female ample. Cerci long, pointed. Femora variously armed beneath; tarsi with large pulvilli and arolia (*). Ootheca large, flattened.

(*) In, Megaloblatta however there is no arolium between the tarsal claws, and the pulvilli are minute.

Nyctibora. Burmeister, Handb. Ent. Vol. 2, p. 501 (1838).

Nyctobora. Saussure, Mem. Hist. Nat. Mexique, Blatt. p. 65 (1864).

Characters. -- Antennae setaceous, only slightly incrassated. Pronotum parabolic, posteriorly sub-truncate, sides deflexed. Tegmina with marginal area broad, near apex equal to half the total breadth of the tegmen. Wings rounded with anterior field broader than posterior, semi-corneous, ulnar vein with many rami. Femora strongly armed beneath. Pulvilli large, occupying the entire length of the second, third and fourth tarsal joints. Cerci long, pointed.

1. N. limbata, Thunberg, Mem. Acad. Sc. St. Petersb. Vol. 10, p. 277 (1826)(Brazil). -- Plate, Fig. 5, 9.
   N. sericea, Burmeister, Handb. Ent. Vol. 2, p. 501 (1838).
   Blatta druryi, Serville, Hist. Nat. Ins. Orth. p. 86 (1839).
   N. terrestris, Saussure, Rev. Zool. (2), Vol. 16, p. 315 (1864); Mem. Mexique, Blatt. p. 68 (1864).
2. N. brunnea, Thunberg, Mem. Acad. Sc. St. Petersb. Vol. 10, p. 278 (1826) (Brazil).
   N. holosericea, Burmeister, Handb. Ent. Vol. 2, p. 502 (1838).
   N. obscura, Saussure, Rev. Zool. (2), Vol. 16, p. 316 (1864); Mem. Mexique, Blatt. p. 67, pl. 1, f. 9 (1864).
3. N. tomentosa, Serville, Hist. Nat. Ins. Orth. p. 86 (1839) (Surinam, Brazil).
   ?N. latipennis, Burmeister, Handb. Ent. Vol. 2,. p. 502 (1838).
4. N. bohlsii, Giglio-Tos, Boll. Mus. Zool. Univ. Torino, Vol. I2, n. 302, p. 7 (1897) (Paraguay).
5. N. intermedia, Saussure, Mem. Soc. Sc. Phys. Nat. Geneve, Vol. 23, p. 105 (1873) (Brazil).
6. N. humeralis, Dohrn, Ent. Zeit. Stettin, Vol. 49, p. 129 (1888) (Upper Amazons).
7. N. tenebrosa, Walker, Cat. Blatt. Brit. Mus. p. 147 (1868) (Demerara).
8. N. confusa, Giglio-Tos, Boll. Mus. Zool. Univ. Torino, Vol. 12, n. 302, p. 7 (1897) (Paraguay).
9. N. borellii, Giglio-Tos, ibidem, p. 8 (1897) (Bolivia).
10. N. glabra, Giglio-Tos, ibidem, p. 9 (1897) (Bolivia).
11. N. mexicana, Saussure, Rev. Zool. Vol. 14, p. 227 (1862) (Mexico).
12. N. azteca, Saussure & Zehntner, Biol. Centr. Amer. Orth. Vol. I, p. 56, pl. 4, f. 34 (1893) (Guatemala).-- Plate, Fig. 2.
13. N. noctivaga, Rehn, Trans. Amer. Ent. Soc. Vol. 29, p. 3 (1903) (Nicaragua). Doubtful species:
14. N. lateralis, Eschscholtz, Entomogr. p. 84 (1822).

Characters. -- Similar to Nyctibora, Burmeister, but the antennae strongly incrassated through--out the greater part of their length. Pronotum transversely elliptical, its posterior border as arcuate as, or more arcuate than, the anterior border. Sides not deflexed. Femora sparsely armed.

1. E. crassicornis, Burmeister, Handb. Ent. Vol. 2, p. 50l (1838) (Brazil). Blatta servillei. Serville, Hist. Nat. Ins. Orth. p. 91 (1839). Paratropes vestita, Saussure, Rev. Zool. (2), Vol. 16, p. 3o8 (1864).
2. E. omissa, Brancsik, Jahresb. Ver. Trencsin. Comit. Vol. 24, P. 186, pl. 3, f. I (1901) (Argentine).
3. E. bicolor, Shelford, Ann. Mag. Nat. Hist. (7), Vol. I9, p. 36 (1907) (Peru).
4. E. nigrocincta, Shelford, ibidem, p. 37 (1907) (Colombia). -- Plate, Fig. 1.

Paratropes, Serville, Hist. Nat. Ins. Orth. p. 117 (1839).

Paratropa. Brunner von Wattenwyl, Nouv. Syst. des Blatt. p. 148 (1865).

Characters. -- Antennae incrassated and plumose in basal half, the joints moniliform, apical half setaceous. Pronotum transversely elliptical, more arcuate posteriorly than anteriorly, sides not deflexed. Pronotum and tegmina with a sericeous pile. Tegmina pointed, almost lanceolate; marginal area at base more than half the total breadth of the tegmen. Wings pointed. Supra-anal lamina in both sexes produced, sub-triangular; sub-genital lamina of male narrow, asymmetrical with stout, flattened styles, of female large, ample, posteriorly sinuate. Cerci short, sub-spatulate. Femora very sparsely armed.

1. P. elegans, Burmeister. Handb. Ent. Vol. 2, p. 493 (1838) (Surinam. Upper Amazons).
   P. bivitta. Walker, Cat Blatt. Brit. Mus. p. 150 (1868).
   P. subsericeus, Saussure, Rev. Zool. (2), Vol. 14, P. 229 (1862).
2. P. lycoides, Serville, Hist. Nat. Ins. Orth. p. 118 (1839) (Brazil).
3. P. aequatorialis, Saussure, Rev. Zool. (2), Vol. 16, p. 309 (1864); Miss. Sc. Mexique, Orth. p. 74 (1870) (Ecuador, Bolivia).
   P. elegans, Blanchard. in d'Orbigny, Voy. Amer. Mer. Vol. 6, p 215, pl. 26, f. 4 (1846).
   P. lycus, f. Saussure, Rev. Zool. (2), Vol. 14, p. 229 (1862).
   P. lanceolatus. Walker, Cat. Blatt. Brit. Mus. p. 150 (1868).
4. P. phalerata, Erichson, in Schomburgk, Brit. Guiana, Vol. 3, p. 580 (1848) (Guiana, Brazil).-- Plate, Fig. 3, 4.
   P. lycus, m., Saussure, Rev. Zool. (2),Vol. 14, p. 229 (1862).
5. P. pica, Walker, Cat. Blatt. Brit. Mus. p. 151 (1868) (Ega). -- Plate, Fig. 10.
6. P. mexicana, Brunner von Wattenwyl, Nouv. Syst. des Blatt. p. 151, pl. 4, f. 15 (1865) (Mexico).
   P. lycus. var., Saussure, Rev. Zool. (2), Vol. 14, P. 229 (1862).
7. P. bilunata, Saussure & Zehntner, Biol. Centr. Amer. Orth. Vol. 1, p. 60 (1893) (Panama).
8. P. biolleyi, Saussure & Zehntner, ibidem, p. 60 (1893) (Costa Rica).

Heminyctobora, Saussure & Zehntner, Biol. Centr. Amer. Orth. Vol. 1, p. 55 (1893).

Characters.- Allied to Nyctibora, Burmeister, but with the tegmina in both sexes truncate and corneous. Wings minute.

1. H. truncata, Saussure & Zehntner. Biol. Centr. Amer. Orth. Vol. 1. p. 56, pl. 4, f. 33 (1893) (Mexico, Guatemala). - Plate, Fig, 8.

Megaloblatta. Dohrn, Ent. Zeit. Stettin, Vol. 48, p. 408 (1887); Saussure & Zehntner, Biol. Centr. Amer. Orth. Vol. 1, p. 56 (1893).

Characters. -- Of large size. Antennae setaceous. Pronotum elliptic. sides not deflexed. Tegmina and wings ample, marginal area of tegmina very broad. Supra-anal lamina produced, sub-quadrate, sub-bilobate, sub-genital lamina of the male narrow, exceeded by the supra-anal lamina, furnished with two slender styles. Penultimate abdominal tergite strongly sinuate in the male, slightly so in the female. Cerci elongate, pointed. Femora most sparsely armed beneath; pulvilli minute, arolia between tarsal joints absent.

1. M. longipennis, Walker, Cat. Blatt. Brit. Mus. p. 8 (1868) (Ecuador, Peru). -- Plate, Fig. 7.
   M. peruviana, Dohrn, Ent. Zeit. Stettin, Vol. 48, p. 409 (1887).
2. M. regina, Saussure, Miss. Scient. Mexique, Orth. p. 116 (1870) (Brazil).
3. M. blaberoides, Walker, Cat. Derm. Salt. Brit. Mus. Vol. 5, Suppl. Blatt. p. 12 (1871) (Nicaragua, Panama). -- Plate, Fig. 6.
   M. rufipes, Dohrn, Ent. Zeit. Stettin, Vol. 48, p. 409 (1887).

Oxford, May I5th 1908.