DICEANOMYIA. 



375 



ochreoiis, venter ochveous. Legs rather dark brown, coxcc and 

 femora towards base ochreous, posterior tarsi and apical tit'th of 

 tibiae white, tarsi somewhat browuisli-tinged at tip ; middle tarsi 

 brown like the femora and tibia). Posterior tarsi scarcely more 

 than half, middle two-thirds, as long as their tibife. Anterior 

 legs missing. 1(7^*^*- hyaline, with golden reflections, but less 

 brilliant than in the other species of the genus ; a distinct though 

 rather diffused stigma. The wing has the typicnl cuneiform 

 shape,* but there is a slight indication of an anal angle. Base 

 of basal cells at one-quarter of wing-length, mediastinal t vein 

 reaching costa much beyond origin of pra^Eurca, about half-way 

 between that and the apex of the 1st longitudinal vein. Sub- 

 costal cross-vein close behind apex of mediastinal vein. Marginal 

 cross-vein and tip of 1st longitudinal rather indistinct, forming 

 an obtuse angle about the middle of the stigma. Discal cell sub- 

 quadrate, great cross-vein about one-third of the way along its 

 lower side. Halteres rather long, stalk ochreous-brown, knob 

 dark brown. 



Lencjth 4*5 millim., of wing 5 millim." (Edwards.) 



Described from a single female taken at Dondra, Ceylon, 

 3. xii.07 {T. Baiahrif/rje Fletcher). 



Type in the British Museum. 



Mr. Edwards adds: "This species must apparently come in 

 the genus Thnjpticomyia, though, like T. saltens, it shn\\-s con- 

 siderable divergence from the type, notably in the long mediastinal 

 vein, the less elongated wings and the less constricted abdomen. 

 Uu fortunately we have no male." 



A character by which this species may be easily distinguished 

 from the others possessing white tarsi, is that only the hind pair 

 (" posterior," Mr. Edwards terms it) are w^hite, the middle pair 

 being concolorous with the middle femora and tibiae. The fore 

 tarsi (missing in the type) may be brown or white ; more probably 

 the former. 



This species is retained in Dicranonv/ia in the present work, as 

 it seems better placed here. The wing shows a trace of an anal 

 angle, which in my opinion suggests that other species exist of a 

 sufficiently intermediate nature to break down this definition as 

 a generic character. The absence of a supernumerary subcostal 

 cross-vein also excludes the species from Tlirijptkomiiia, Skuse. 

 The relative lengths of the different veins in species of Dicrano- 

 iiD/ia are very variable. Were it not that the typical species of 

 Sli use's genus is represented by six specimens the additional cross- 

 vein might have been presumed to be accidental. 



* Edwards is of course referring to the genus Tlirypticnmyia, in which he 

 places his species, and in which the cuneiform shape of the basal part of the 

 ■n-incr is n (rfiiifiric character. 



■wing is a generic character. 



+ Synonymous with auxiliary vein 



