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Show 1875.] MR. G. B. SOWERBY ON NEW SPECIES OF SHELLS. 125 I sent the three specimens which I collected on that day to my friend M . Salle, who wrote to m e immediately that they were very fine insects, and very rare in collections. In consequence of this information I went again to Tepanzacualco in May 1860, but could find only two more specimens. In July of the same year I was on m y way to the Atlantic coast for change of air (being very ill of pleurisy), when I saw one of these insects near Talea, not far away from Tepanzacualco. I could not resist the temptation to search for them, and was so fortunate as to collect about twelve. At the same time I found also several specimens of a new Golofa, described some time after by Mr. James Thomson as Golofa imperator. P. victorina is more easily found than the other species from its more conspicuous appearance, the difference in colour between its head and thorax and its elytra being very striking. List of the Species. 1. Plusiotis resplendens, p. 119. 9. Plusiotis lacordairei,^. 122. 2. aurora, p. 119. 10. auripes, p. 122. 3. batesi, p. 119. 1.1. psittacina, p. 123. 4. chrysargyrea, p. 120. 12. costata, p. 123. 5. marginata, p. 120. 13. sailed, p. 123. 6. adelaida, p. 121. 14. laniventris, p. 124. 7. l/eta, p. 121. 15. mnizechii, p. 124. 8. gloriosa, p. 121. 16. victorina, p. 124. EXPLANATION OF PLATE XXIII. Fig. 1. Mandible of Pelidnota. 2. Mandible of Plusiotis. 3. Plusiotis sallcei, p. 123. 4. lacordaireii, p. 122. Fig. 5. Plusiotis resplendens, p. 119. 6. batesi, p. 119. 7. aurora, p. 119. 4. Descriptions of ten new Species of Shells. By G. B. SOWERBY, Jun. [Received February 23, 1875.] (Plate XXIV.) 1. CONUS GRACILIS, n. sp. (Plate XXIV. fig. 6.) C. testa elongata, basin versus multo attenuata, superne suban-gulata, fusca, maculis albidis irregulariter aspersa, undique transversim sulcata, sulcis angustis, sub dist antibus, crenulatis; spira elata, subgradata, acutiuscula ; apice papillari; anfractibus 9, superne concavis, crenato-bisulcatis; apertura angusta. Long. 31, maj. diam. 10, min. 2 mill.; spira alt. 8 mill.; apert. long. 23, maj. lat. 2, min. 1^ mill. An elongated Cone, much attenuated towards the base, obtusely |