Revision der Helomyziden. 239 
ments with a definite black band. Length to the tip of the wings 
seven-twentieths of an inch. 
Very common on the Missouri. I observed it particularly above 
Cow-Islands. « 
21. Helomyza plumata Lw. 39. 
1562 Helomyxa plumata, Loew in: Berlin. ent. Zeitschr. VI. 227 
Cent. II. 88. 9. 
»Flava, venis transversis apicibusque venarum longitudinalium 
anguste fusco-limbatis, pleurarum dimidio superiore omnino nudo, 
scutello rare piloso, apicem versus denudato, seta antennarum pilis 
perlongis plumata. 
Flava, opaca, eolore frontis, thoracis et seutelli pleurumque magis 
in latericium vergente. Antennae sulphureae, articulo tertio ovato, seta 
pilis longis plumata. Oculi mediocres, rotundi; genae latiusculae; seta 
mystacina utrinque unica mediocris. Thoracis dorsum punetis minu- 
tissimis fuseis aspersum, punctis setas ordinarias ferentibus paulo 
maiorıbus. Scutelli dimidium basale rare pilosum, apicale nudum. 
Pleurae obsolete subvittatae, dimidio superiore plane nudo. Margo 
seementorum abdominalium singulorum posticus nigricans. Pedes pallide 
flavescentes, tarsis apicem versus infuscatis. Alae subhyalinae, ex 
‚luteo einerascentes, venis transversis venarumque longitudinalium apieci- 
bus anguste fusco-limbatis, setulis costae rarioribus, medioeribus. « 
Länge: 5—6'5 mm. — Vorkommen: Nordamerika (New-York). 
22. Helomyza flava Mg. SV. 
1820 Helomyxa rufa, p. p. Fallen, Dipt. Suec., Heteromyz. 4, 2 
1530 » flava, Meigen, System. Beschr., VI. 50. 3. g'. 
1530 » praeusta, Meigen, System. Beschr., VI. 52. 3. g\. 
1350 ? Surllia communis, Robineau-Desvoidy, Myod. 643. 4. 
1835 ? Helomyxa flava, Macquart, Hist. Nat. Dipt. I. 411,3. gY. 
und. Pl. 18, Fig. 15. 
1838 >» rufa, Zetterstedt, Ins. Lapp. 765. 3. 9. 
1847 » flava, Zetterstedt, Dipt. Scand., VI. 2442.8. J'Q. 
1847 » praeusta, Zetterstedt, Dipt. Scand., VI. 2443. 
INTER. 
(1559) » flava, Loew in: Z. Ent. Breslau, XII. 28. 9, 39. 
1564 » »  'Schiner, F. A. 25. 9, 
1867 » » Rondani in: Attı Soc. Ital. Sc. Nat., Milano, 
X. 120. 
Wiener Entomologische Zeitung, XXIII. Jahrg., Heft IX (30. November 1904), 
