Kahl: The Dipterous Genus Leucophenga Mik. 365 



Leucophenga. Blcesochcetophora Czerny, Cyrtonotum Macquart, and 

 AstceincE Loew I do not 'include 'in the discussion. Professor Strobl 

 in a footnote to the article cited adds another character to the genus, 

 which is very important, as it does not agree with my studies of the 

 species of Leucophenga at my disposal, and I herewith copy his 

 note: "Leucophenga Mik, Wiener Entomolog. Ztg., 1886, pag. 317. 

 Diese schon von Schiner (Collect. Schin. i. Litt.) als Argyrolampra 

 von Drosophila gesonderte Gattung zeichnet sich durch die zwischen 

 der 3. und 4. Langsader auffallend diinnere Randader aus, dass die 

 Randader nach der 3. Langsader aber ganz erlosche, konnte ich weder 

 von meinen 9 Exemplaren der maculata, noch von meiner neuen Art 

 behaupten; ferner (maculata, wahrscheinlich auch quinquemaculata) 

 durch den Silberglanz des mannlichen Thoraxriickens; besonders aber 

 dadurch, dass die Stirn nur I mittlere Randborste und knapp hinter 

 ihr, etwas naher dem Auge, eine ebenso grosse besitzt; es fehlt also 

 die 3., hintere Randborste der echten Drosophilen (z. B. unimaculata, 

 transversa, phalerata, funebris) ; bei einigen Drosophila- Arten (costata 

 Zett., nigrimana Mg.) steht die vordere Randborste ganz nahe den 

 Fiihlern, bei den iibrigen ungefahr in der Stirnmitte." All the species 

 of Leucophenga described below (as well as the North American L. 

 quadrimaculata Walker and L. maculosa Coquillett) have three strong 

 fronto-orbital bristles with the uppermost one nearer the vertex than 

 in the true Drosophila, or at least midway between the inner vertical 

 and the lower reclinate bristles, except in L. goodi sp. nov. from Ka- 

 merun, in which the upper reclinate bristle is distinctly nearer to the 

 lower reclinate than to the inner vertical. In the true Drosophila 

 there are also three fronto-orbitals, two of which are strong, with a 

 lower one proclinate, an upper reclinate, and between them, or at the 

 level with the proclinate, a small or even exceedingly minute (rarely 



is a little nearer to the upper reclinate than to the proclinate; two noto-pleurals 

 (Coquillett calls them " posthumerals " after Osten-Sacken) ; prescutellars not dif- 

 ferentiated from the quite strong setulae of mesonotum; one well-developed pre- 

 sutural (Coquillett calls this bristle erroneously "the anterior one" of five supra- 

 alars); the supra-alars and postalars (Coquillett's "supra-alar bristles") situated 

 as in Leucophenga; the anterior supra-alar small, but differentiated from the setulae 

 of mesonotum; the posterior postalar quite well developed; third antennal joint 

 (present in one of my specimens only) not so long as given by Coquillett for his 

 specimens, but appears hardly longer than wide; the postverticals well developed, 

 converging; the costa broken through twice, as is the case in Drosophilina. That 

 my determination is correct there can be no doubt, although the localities are very 

 distant (Coquillett's specimens came from Cape Colony). 



