78 DIPTEfiA. 



There are also the following described species from within our Hmits : — 



Ceria rufibasis, Bigot, Ann. Soc. Ent. Fr. 1883, p. 318 (Sphymm&rpha).— Mexim 



arietis, Loew, Neue Beitra^e, i. p. 17. — Mexico. 



cacica, Walk. Trans. Ent. Soc. Lond. n. ser. v. p. 288. — Mexico. 



Most of the following species of Syrphidae, described from, or referred to, Central 

 America, are of more or less doubtful generic position ; others have been inadvertently 

 omitted from the lists on the preceding pages : — 



Pipiza divisa, Walk. Trans. Ent. Soc. Lond. new ser. iv. p. 156. — Vera Cruz. 

 Lepidomyia cincta, Bigot, Ann. Soc. Ent. Fr. 1883, p. 345. — Mexico. 

 Syrphus colludens, Walk. op. cit. v. p. 293. — Mexico. 



s, Macq. Dipt. Exot. l er Suppl. p. 139, t. 11. f. 13.— Mexico. 



Volucella aperta, Walk. op. cit. v. p. 292. — Mexico. 



postica, Say, Journ. Acad. Phil. vi. p. 166 ; Complete Writings, ii. p. 360. — 



Mexico. 



tibialis, Macq. Dipt. Exot. l er Suppl. p. 123. — Yucatan, Merida. 



Temnocera unilecta, Walk. op. cit. v. p. 292. — Mexico. 

 mridula, Walk. op. cit. v. p. 292. — Mexico. 



Eristalis lateralis, Walk. Trans. Linn. Soc. xvii. p. 347; List of Diptera, iii. 



p. 622. — Mexico, Guiana, Brazil, Chili, Jamaica. 



semicirculus, Walk. Ins. Saund., Dipt. i. p. 249. — Honduras. 



Helophilus formalis, Walk. List of Diptera, iii. p. 603. — Mexico. 



Doliosyrphus hirtipes, Bigot, Bull. Soc. Ent. Fr. 1882, p. cxxi ; Ann. Soc. Ent. Fr. 



1883, p. 343.— Panama. 

 Xylota arquata, Say, Journ. Acad. Phil. vi. p. 162 ; Complete Writings, ii. p. 357. 



— Mexico. 



subcostalis, Walk. Trans. Ent. Soc. Lond. new ser. v. p. 291. — Mexico. 



ADDENDA. 



RHOPALOSYRPHUS. 



Rhopalosyrphus, Giglio-Tos, Bollett. dei Musei di Zool. ed Anat. comp. della R. Univ. di Torino 

 vi. no. 108, p. 3, figg. (Sept. 1891). 



This genus, of which the type-species, from Mexico, is not yet described, is closely 

 allied to Mixogaster, as it is accepted in the present work, but differs from it in tbe 

 prominence at the lower part of the face. 



