Genera and Sj>ecies ofTi\ha)\\dix\ 11 



margin of the third segment ; dorsnni clothed \\ itli minute, 

 apiJicsscd hairs, jjiile yellowish or vcnowish white on the 

 fonrth segment and on the ereani-eoloured band at the base, 

 (hirk brown on the dark brown band, and lighter brown on 

 tilth and following segments; venter in non-diseolonred 

 specimens cream-eolonred at base, then mainly cream-buff, 

 Avhitish cream-buti", or whitish, followed by ochraceous-bnff at 

 distal extremity, which is clothed with brownish hair, venter 

 elsewhere clothed with minute, appressed. yellowish-Avhite 

 Iiair. Jl'iii(/s with a faint se[)iaeeous tinge, which in certain 

 specimens is somewhat more j)ronouiieed at extreme tip, next 

 costa ; veins for most part dark brown, those forming distal 

 l)oundary of first and second basal cells darker than else- 

 where, and more or less suffused with sepia ; stigma sharply 

 defir.ed, varying in length in different specimens from 1-2 

 to r4 mm. S(picim<e sepia-coloured, border dark brown. 

 Halteres : knobs elove-brown, stalks cream-buff, dark brown 

 at distal extremity. Legs eream-buff or buff, tips ot" front 

 and hind femora and tibicC dark brown, tips of middle femora 

 and tibiie brown, front tarsi clove-brown, middle and hind 

 tarsi daik brown, proximal two-tliirds of first joint of middle 

 tarsi paler. 



^ladagiiscar : type and nine other specimens from Andra- 

 nolava, Majunga Province, North-West Madagascar, October 

 15 to November, 1907 {J. J. Lloyd). 



The collector's field-note runs : — " Seen from October 13 

 to November. Appears only in cool places^ usually in 

 evening. Bite very painful. '' 



So far as the structure of the third joint of its antennae 

 is concerned, the species dcseiibed above is an aberrant form, 

 which agrees witb likinomyza edentula, Wied., and Rh. pusi//a 

 {Erodiorhynchus pusillns), Schin. — the habitat of each of 

 which is the Cape of Good Hope, — in the absence of an 

 upper branch to the joint in question. As regards the re- 

 mainder of its cephalic characters, except that the proboscis 

 is somewhat s-hortcr than usual, the new species is a true 

 Rhinomyza, and to place it in this genus — the only existing 

 one to which it could possibly be assigned — is preferable to 

 founding a new genus for its reception. The comparative 

 shortness of its proboscis prevents Rh. simplicicornis from 

 being regarded as belonging to the same group as R/i. edentula, 

 Wied., and Rh. pusilla, Seliin., though it agrees Avith these 

 species in its Avings being devoid of coloured bands or 

 blotches. In the large size and conspicuous appearance 

 of the stigma, as well as in having its wings otherwise 

 unmarked, Rh. simplicicontis agrees with Rh, {Dichelacera) 



