1900.] INSECTS AND ARACHNIDS FROM SOMALILAND. 63 



h*. List, abdominal sternite and lower side of 1st and 



2nd caudal segments, and usually also of 3rd, 



smooth ; caudal segments 1-3 keeled below. 



a 6 . 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. 



6 B . 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. Pseitdophia oppia, p. 18. 



2. Chilena sabrina, p. 20. 



3. Cerocala munda, p. 19. 



4. Acrma mirahilis, p. 11. 



5. Beknois peeli, <$ , p. 15. 

 6 2, P . 15. 



7. Pseiidophia liucata, p. 19. 



8. Pangonia tricolor, p. 7. 



Fig. 9. Genecerus vebulosus, p. 26. 



10. Psiloptera somalica, p. 25. 



11. Agrypnus longicornis, p. 26. 



12. Sepidium magnum, p. 29. 



13. FJiytidonota robusta, p. 28. 



14. Sepidium bilobatum, p. 30. 



15. Julodis laticollis, p. 25. 



16. Trox expatiates, p. 22. 



Plate II. 

 Orthoptera from Somaliland. 

 Fig. 1. Rhegmatopoda peeli, p. 44> Left elytron, r$ . 



2. Otiaphysa angustipennis, p. 43. Left elytron. $ . 



3. Sauracris lacerta, cS , p. 41. 



4. Charieis peeli, 2 > P- 37. (Antennas and apex of abdomen missing.) 

 ft. Milititsa somaliensis, p. 43. Eight elytron. $> . 



6. Burria longixipha, $> , p. 38. 



7. Milititsa somaliensis, p. 43. Head and pronotum. 



Plate III. 



Ticks from Somaliland. 



Fig. 1. Rhipiccphalus marmorcus, p. 50. cJ. Dorsal view, x 11 times linear. 

 1 a. „ „ Ventral view. 



1 b. „ „ Capitulum and mouth-parts from below. 



1 c. „ ,, Ooxss of 1st and 2nd legs. 



Id. „ „ Stigma, adanal plate, and anus of left side. 



2. Rhipicephalus ar mains, p. 50. c?. 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. 



2 c. „ ,, Lateral view of posterior end of abdomen show- 



ing adanal plate, spike above it, and stigma. 

 2/. „ „ 2 • 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. But hits calviceps, p. 54. Carapace. 



3 a. „ „ Underside ot 3rd, 4th, and 5th caudal segments. 

 3 b. „ „ Chela. 



