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Show 1900.] INSECTS AND ARACHNIDS FROM SOMALILAND. 63 b3. List abdominal sternite and lower side of 1st and 2nd caudal segments, and usually also of 3rd, smooth ; caudal segments 1-3 keeled below. ab. Lower surface of 4th caudal segment coarsely but sparsely granular, the median keels obsolete, the lateral keels strongly denticulate; superior and superior-lateral crests of tail smooth; protarsal segment of 1st and 2nd legs with a single external apical spine pugilator. bb. Lower surface of 4th caudal segment not uniformly and coarsely granular, furnished with four normal, subequally strong keels ; superior and superior-lateral crests of tail denticulated ; protarsi of 1st and 2nd legs with at least two external spines militaris. EXPLANATION OF THE PLATES. PLATE I. Lepidoptera, Coleoptera, &c, from Somaliland. Fig. 1. Pseudophia oppia, p. 18. 2. Chilena sabrina, p. 20. 3. Cerocala munda, p. 19. 4. Acraa mirabilis, p. 11. 5. Belenois peeli, d> P- 15. 6. „ „ 2, p. 15. 7. Pseudophia lineata, p. 19. 8. Pangonia tricolor, p. 7. Fig. 9. Genecerus nebulosus, p. 26. 10. Psiloptera somalica, p. 25. 11. Agrypnus longicornis, p. 26. 12. Sepidium magnum, p. 29. 13. Bhytidonota. robusta, p. 28. 14. Sepidium bilobatum, p. 30. 15. Julodis laticollis, p. 25. 16. Trox expansus, p. 22. PLATE II. Orthoptera from Somaliland. Fig. 1. Bhegmatopoda peeli, p. 44. Left elytron, d - 2. Otiaphysa angustipennis, p. 43. Left elytron. $ • 3. Sauracris lacerta, d» p. 41. 4. Charicis peeli, 2 . P- 37. (Antennae and apex of abdomen missing.) 5. 31ilititsa somaliensis, p. 43. Right elytron. 2 • 6. Burria longixipha, 2 , p. 38. 7. Milititsa somaliensis, p. 43. Head and pronotum. PLATE III. Ticks from Somaliland. Fig. 1. Bhipicephalus marmoreus, p. 50. d- Dorsal view. X 11 times linear. 1 a. „ „ Ventral view. 1 b. „ „ Capitulum and month-parts from below. le. „ ,, COXEB of 1st and 2nd legs. Id. „ „ Stigma, adanal plate, and anus of left side. 2. Bhipicephalus armatus, p. 50. d- Dorsal view. X 11 times linear. 2 a. ,, ,, Ventral view. 2 b. „ „ Capitulum and mouth-parts from below. 2 c. „ „ Coxa and trochanter of 1st leg. 2d. „ „ Adanal plate of right side. 2e. „ „ Lateral view of posterior end of abdomen showing adanal plate, spike above it, and stigma. 2f. „ ,, 5 • Dorsal view. PLATE IV. Scorpions from Somaliland. Fig. 1 • Pandinus pugilator, p. 52. Nat. size. 1 a. „ „ Underside of tail. 2. Pandinus peeli, p. 53. Underside of tail. 3. Buihus calviceps, p. 54. Carapace. 3 a. „ „ Underside ol 3rd, 4th, and 5th caudal segments. 3 b. „ „ Chela. |