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Show 1883.] ON HVMENOPTERA AND DIPTERA FROM TIMOR LAUT. 343 EXPLANATION OF THB PLATES. PLATE XXXIII. Fig. 1. Clausilia subvirginea, p. 327. 2. sublamellosa, p. 827. 3. aphrodite, p. 329. 4. thicssecs, p. 329. 5. astropalia, p. 330. 6. sculpticollis, p. 331. 7. , var. unia, p. 331. 8. - - heraclecnsis, p. 332. 9. manselli, p. 332. 10. vermiculata, p. 333. PLATE XXXIV. Fig. 11. Clausilia vesti, p. 334. 12. carpathia, p. 335. 13. privigna, p. 336. 14. conemenosi, p. 337. 15. goldfussi, p. 338. 16. schuchi, var. oscarii, p. 339. 17. incrustata, p. 339. 18. ahyssoclista, p. 340. 19. campylauchen, p. 340. 3. Report on a small Collection of Hymenoptera and Diptera from the Timor Laut Islands, formed by Mr. H. O. Forbes. By W . F. KIRBY, Assistant in the Zoological Department, British Museum. [Eeceived April 16, 1883.] The Timor Laut or Tenimber Islands are a small archipelago situated to the north of Australia, about halfway between the island of Timor and the Aru Islands. The largest island is Timor Laut; but the small collection before me, consisting of only five species of Hymenoptera (all new) and three of Diptera, was formed in two of the smaller islands, viz. Larat and Maroe. I will now proceed to describe the Hymenoptera and to notice the Diptera, merely remarking that they exhibit strong affinities to those of the surrounding groups of islands, as would naturally be anticipated beforehand. The specimens are numbered ; and I have noted these numbers throughout. HYMENOPTERA ACULEATA. APID^E. CROCISA CJERULEIFRONS, sp. n. Long. corp. 5 lin. Femcde. Black, face aud orbits (very broadly above) blue ; prothorax with a short stripe behind on each side above, and a very large spot on the sides ; mesothorax with seven blue spots-two small |