70 HYMENOPTERA. 



Myzine and Plesia, and the same opinion is adopted by Jurine, 

 who unites them under the name of Plesia ; Ohvier, Panzer, and 

 more recently M. Guerin, in a Monograph pubHshed in the 

 Dictionnaire jnttoresque d'Histoire naturelle, 1837, adopts a con- 

 trary opinion ; they are reunited here on the authority of Edward 

 Doiibleday, 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 

 been received from Mr. H. W. Bates, collected at Santarem, 

 Brazil. 



1. Myzine sexfasciata. B.M. 



ScoUa sexcincta, Rossi, Faun. Etrus. ii. 73. 839 (nee Fahr.). 

 Scolia sexfasciata, Rossi, Faun. Etrus. Mant. App. p. 136. t. 3. 



f. c; Faun. Etrus. Ed. Illig. ii. 116. 839. 

 Scolia volvulus, Fahr. Ent. Syst. Supp. p. 256. 38. 

 Scoha cylindrica, Fabr. Ent. Syst. ii. 238. 38. 

 Ehs 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? 

 Helius cylindricus, Panz. Faun. Germ. Revis. ii. 262. 

 Myzine sexfasciata, Guer. Diet. pitt. d'Hist. nat. v. 675 ; Icon. 

 Reg. Anim. Ins. p. 430. t. 69. f. 9. 



Van d. hind. Obs. Hym. Eur. 285. 1. 



Lucas, Exp>lo. Sc. Alger, iii. 283. t. 15. f. 8. 

 Plesia volvulus, Latr. Gen. Cr. et Ins. iv. 112 <? . 



St. Farg. Hym. iii. 580. 8 S , var. 

 Plesia sexfasciata, St. Farg. Hym. iii. 585. 13 <? . 

 Plesia menechma, St. Farg. Hym. iii. 583. 11. var. <? . 



Hab. France; Italy; Germany; Algeria. 



2. Myzine geniculata. B.M. 



Myzine geniculata, BruUe, Exped. Sc. de Moree, Zool. iii. S . 

 Guer. Diet. pitt. d'Hist. nat. v. 575. 



Hab. Morea. 



3. Myzine parvula. B.M. 

 Male. Length 3-3f lines. — Head and thorax rugose-punctate, 



the posterior margin of the prothorax sometimes incomplete. 



