ONCODES. 169 



dense pubescence ; alar squamae with soft down ; halteres short. 

 Abdomen dorsally arched, lower side more or less flat, 5-segmented ; 

 short ovate in 6 , short and round in $ ; pubescence moderate ; 

 genitalia concealed. Legs rather short and stout, simple, no 

 spurs, tarsi with 1st and 5th joints longer than the others ; 

 pulvilli and claws distinct. Wings in S short, in $> larger and 

 longer, venation imperfect, the veins failing to reach the margin; 

 2nd longitudinal vein absent, 3rd nearly straight, unforked, 

 projected in a direction much below wing-tip; anterior cross- 

 vein apparently present, though weak; 4th vein forked, lower 

 branch again forked ; 5th vein forked widely, the upper branch 

 sharply angled, at which point it seems anastomosed with the 

 lowest branch of the 4th vein, so it is difficult to say if the 

 posterior cross-vein is present or not ; * anal and axillary veins 

 present, weak. Two basal cells, fairly distinct ; no discal cell ; 

 posterior cells merged in the open hind part of wing ; anal cell 

 open owing to the foreshortened anal vein. 



Range. Europe, N. America, N. Africa, Asia, Australasia. 



Life-history of two or more European species more or less 

 known. t 



Table of Species. 



1. Abdomen without bands fuscus, Brum, p. 171. 



Abdomen with pale transverse bands 2. [p. 170. 



2. Conspicuous pale spots on abdomen octomaculatus, Brum, 



Without abdominal spots 3. 



8. Posterior corners of thorax and hind margin [p. 171. 



of scutellum distinctly pale rufomarginatus, sp. m, 



These parts not pale 4. 



4. Thorax unmarked; wings brownish yellow; [sp. m, p. 171. 



basal half of tibiae tawny ; leugth 5 mm. . . angustimarffinatus, 

 Thorax with two tawny stripes ; wings clear ; 

 legs black, except coxse below and knees ; 

 length 3 mm costalis, Walk., p. 169. 



128. Oncodes costalis, Walk. 



Henops costalis, Walker, Ins. Saund., Dipt. pt. 3, p. 203 (1852). 



"Head black; feelers tawny ; chest and breast pitchy, clothed 

 with pale tawny hairs ; chest adorned with a tawny border and 

 two tawny stripes ; abdomen pitchy ; hind borders of the segments 

 whitish; legs pitchy; hips beneath, knees, and fore feet tawny ; 

 wings colourless, wing-ribs and veins dark tawny ; veins partly 

 pitchy along the fore border ; scales pale grey, with tawny borders. 

 Length of the body 1| lines, of the wings, 3 lines. East Indies." 

 (Walker.) 



A specimen is in the British Museum, labelled simply " Ind., : ' 

 and I am informed that it probably came from India proper. 



* Vei-rall says it is absent, 

 t See p. 157. 



