70 HYMENOPTERA. 
Myzine and Plesia, and the same opinion is adopted by Jurine, 
who unites them under the name of Plesia; Olivier, Panzer, and 
more recently M. Guérin, in a Monograph published in the 
Dictionnaire pittoresque d’ Histoire naturelle, 1837, adopts a con- 
trary opinion ; they are reunited here on the authority of Edward 
Doubleday, who formed large collections of insects in the United 
States ; his accuracy of observation is well known, and he stated 
that he had on numerous occasions detected the Tiphia namea 
and Elis sexcincta, of Fabricius, “in coitu,” which places the 
propriety of forming one genus for these insects beyond a doubt. 
Specimens of new species, sent as the sexes of the same, have 
Jen received from Mr. H. W. Bates, collected at Santarem, 
razil. 
1. MyZINE SEXFASCIATA. B.M. 
Scolia sexcincta, Rossi, Faun. Etrus. ii. 73. 839 (nee Fabr.). 
Scolia sexfasciata, Rossi, Faun. Ktrus. Mant. App. p. 136. t. 3. 
f.c; Faun. Etrus. Ed. Iillig. i. 116. 839. 
Scolia volvulus, Fabr, Ent. Syst. Supp. p. 256. 38. 
Scolia cylindrica, Fabr. Ent. Syst. 1. 238. 38. 
Elis volvulus et cylindrica, Fabr. Syst. Piez. 249. 5. 6. 
Myzine volvulus, Latr. Hist. Nat. des Ins. xiii. 269. 
Myzine sexfasciata, Spin. Ins. Lig. i. 78. 1. 
Myzine cylindrica, Spin. Ins. Lig. i. 79. 2. 
Sapyga cylindrica, Panz. Faun. Germ. 87.19? 
Hellus cylindricus, Panz. Faun. Germ. Revis. 11. 262. 
Myzine sexfasciata, Guér. Dict. pitt. d Hist. nat. v. 575; Icon. 
Reg. Anim. Ins. p. 430. t. 69. f. 9. 
Van d. Lind. Obs. Hym. Eur. 285. 1. 
Lucas, Explo. Sc. Algér. iii. 283. t. 15. f. 8. 
Plesia volvulus, Latr. Gen. Cr. et Ins. iv. 112 ¢. 
St. Farg. Hym. iu. 580. 8 3, var. 
Plesia sexfasciata, St. Farg. Hym. iii. 585. 13 8. 
Plesia menechma, St. Farg. Hym. i. 583. 11. var. 3. 
Hab. France; Italy ; Germany; Algeria. 
2. MyZINE GENICULATA. B.M. 
Myzine geniculata, Brullé, Expéd. Sc. de Morée, Zool. in. 3 . 
Guér. Dict. pitt. d’ Hist. nat. vy. 575. 
Hab. Morea. 
3. MyZINE PARVULA. B.M. 
Male. Length 3-3? lines.—Head and thorax rugose-punctate, 
the posterior margin of the prothorax sometimes meomplete, 
