— 510 - 



of the alKlonicn yellow; femoia wilh tlie basai half yellow, ihe apicnl lialf 

 black; wings greyish subhyaline, Ibe base aud costal région ycliowisli. 



Female. — Length about i3,5 mm.; Aving, ih mm. 



Frontal prolongation of the bead black, more brownisb laterally beneatb 

 ibe long, siender nasus; palpi with tbe two basai segments brown, ihc 

 leimiiial two conspicuonsly yellow; nloulbpa^^^ dark browii. Aniennae 

 liglit yellow, onl\ llie distal flagellar segments more brownisb. llead bJack, 

 llie vertex surrounding tbe antennal bases ligbt yellow; a browu spot 

 at tbe inuer majgin of tbe eyes at the narrowesl point of the vertex; ibe 

 velvety black posterior poition of tbe vertex sends a médian point forwards 

 between ibe eyes; occiput witb a conspicuous opaque, circular area of a 

 greyisb color. 



Pronotum black, tlic sculum broadly and vei'v conspicuously yellow. 

 Mesolborax black w itb indistinct grey siripes on tbe praesculum and giey 

 centers to tbe scutai lobes. Haltères ligbt yellow. Legs A\ith ibe coxae 

 black; frocbanteis dark biownish black, tbe fore trocbanters paler; femora 

 Avilb tbe basai balf biigbl yellow, tbe iipical balf black, on the fore femora 

 Ibe yellow bases a Htlle narrower: tibiao ligbt brownisb yellow passing 

 inlo dark brown at tbe tips, tbe extrême bases brown; tarsi dark brownisb 

 black. Wingsgrevish subliyaline, bright yellow basally and in tbe costal 

 aud subcostal cells; slignia oval, dark brown, tbe center hairy; wing-apex 

 a litlle darkened; obliteralivf! area before ibe slignia exlcnding along tbe 

 cord to tbe fork of M; a snialler area beyond the slignia; veins dark brown. 

 Venalion : /i-j^;; a little shoilei' iban //s; celle M\ l'ather broadly sessile; 

 fusion of il/ end tjic basai delleclion of Cu\ punctiloiiu. 



Abdomen with segments one and five to eiglit black; two to fonr \ello\\, 

 broadly margined lalerallv \\\\\\ black; slcrnites similar, ihe yellowisb 

 more obscure, tbe brown latéral margins a little broader. Génital segment 

 and ovipositor more horn-colored. 



Uahital. — Madagascar. 



IIolotj()e,9, Imcrina, Forêt d'Andrangoloaka, 1891 (A. Giamlidier). 



T\pe in the (îolloction of the Paris Muséum. 



The unique t\pe is curiously deformed , the left side of the mesonotal 

 praesculum being deeply impressed, distorting the usual prnoscnUd siripes. 

 Il seems probabl\ thaï this injury occured wbile tbe lly was still teucral 

 or still in tbe pupal stage. 



Nephrotoma xanthoplaca nov. s». 



(leneral coloration ligbt yellow, Ihe mesonotal praesciitiim and scutiiin 

 wilh a solid black patlern; haltères yellow; femora yellow, Ihe apices 



