1014.] NATURAL SCIENCES OF PHILADELPHIA. 589 



Pleurae, dorsal pleurites purplish brown, sternum lighter grayish 

 brown, the two enclosing a broad light yellow stripe beginning behind 

 the fore coxa and ending above the hind coxa. Halteres pale brown, 

 the knob a little darker. Legs with the coxee and trochanters dull 

 yellow, femora and tibiae yellow, the latter a little darkened at the 

 tip. tarsi dark brown. Wings light brown, stigma small, rather 

 indistinct, veins brown; venation (PI. XXVII, fig. 26): Sc2 far re- 

 moved from the tip of Sci; cross-vein r rather indistinct at the fork of 

 R.+z; cell Ml absent; outer deflection of M3 absent; basal deflection 

 of Cu, at the fork of M. 



Abdomen dark brown, the pleural line and the genital segment 

 yellowish. 



The paratype has the two basal segments of the antennae yellowish, 

 the head behind gray, cross-vein r very indistinct, basal deflection 

 of Cui before the fork of M. 



Holotype, 9 , Biscayne Bay, Dade Co., Fla. (Mrs. A. T. Slosson). 



Paratype, 9 , Paraiso, Canal Zone, January 29, 1911 (Aug. Busck). 



I was unable to detect tibial spurs on this insect. The general 

 appearance is more like that of a Lininophila than any other form 

 known to me and I refer it to Gonomyia with considerable doubt. 

 The long Sc and cross-vein r are not typical of Gonomyia. 



Genus CLADURA Osten Sacken. 

 1859. Cladura Osten Sacken; Proc. Acad. Nat. Sci. Phila., p. 229. 

 Cladura delicatula sp. n. 



From the only described American species, C. flavo-ferruqinea O. S. 

 (= indivisa O. S.), this form differs in its very much smaller size and 

 pale coloration. The specimens of indivisa mentioned by Osten Sacken,^ 

 where he states "some of the specimens, probably recently excluded, 

 were pale and without spots," may have belonged to this form. There 

 are no brown spots on the pleurae; the extreme lateral margin of the 

 abdominal tergites is dark; the wings are hyaline and lack the dark 

 markings on the cord, origin of the sector and on the outer deflection 

 of cell 1st Ml. I have compared this insect with the extensive 

 series of Cladura studied by Mr. Leonard and myself^ and have no 

 doubt of its specific distinctness. The wing is figured in PI. XXVII, 

 fig. 27. 



Female, length, 4.6-4.7 mm.; wing, 5.6-5.7 mm. 



2Mon. Dipt. N. Am., vol. 4, p. 189. 



' Venational variation in Cladura, Joitrn. N. Y. Entomological Society, vol. 20, 

 pp. 36-39, 1912. 



