268 Transactions. — Zoology. 



marginal cell ; fifth longitudinal strong, slightly arcuated ; 

 sixth longitudinal rudimentary, represented by a straight line 

 of black hairs. 



This genus is in some degree a connecting-link between the 

 foregoing genera. I have not got sufficient material to ascer- 

 tain its exact position. 



Huttonia tridens. Plate VIII., fig. 2. 

 Platyura tridens, Hutton (Cat. N.Z. Diptera). 



Length of antenna, 0-078 ; size of body, 0-0245 x 0-038 ; 

 expanse of wing, 0-225 x 0071. 



Antennae 2 + 16 jointed ; joints of scapus thick and 

 cyathiform, light-yellow, fringed with black hairs ; joints 

 of flagellum compressed, oval in outline, the first nine 

 joints yellow at the base, the centre is coloured brown, and 

 the apical portion again is yellow ; there is uo sharp line 

 of demarcation between the yellow and brown bands. 

 Palpi yellow ; first joint dark - yellow, long and thick, 

 covered with short black hairs ; second rather shorter than 

 the first and slender, with very few black hairs ; third and 

 fourth same thickness as the second but much shorter, 

 the latter being rather pointed ; a few black hairs on third 

 and fourth joints. Eyes emarginate, almost meeting above 

 the bases of the antennae. Front black round the ocelli, 

 shading to black posteriorly. Collare light-yellow. Anterior 

 portion of the thorax light-yellow, but bordered with a narrow 

 streak of brown ; three longitudinal bands blending together 

 anteriorly behind the yellow band ; central longitudinal band 

 much shorter than the lateral ones, not extending more than 

 half-way down the thorax ; whole thorax covered with short 

 black hairs. Epimera light-yellow above, but black just above 

 insertion of the coxa. x\ very few long stout black hairs on 

 the lateral and posterior margins of the mesothorax. Scutel- 

 lum smoky-brown, fringed with six very long black hairs. 

 Metathorax and pleurae dark-brown. Halteres with rather a 

 slender pedicel, bearing a densely cmereous club. Abdomen 

 dark-brown, the posterior half of each segment yellow ; • a 

 thin covering of black hairs on all the segments. Forceps of 

 male light-yellow, ending in a black claw, and covered with 

 short black hairs. Legs rather long ; coxae yellow, v^^ith a 

 few black hairs on the outer side ; femora darker, about 

 twice the length of the coxae ; tibiae darker, with short black 

 hairs and longer spines ; spurs moderately long, black ; tarsi 

 rather short, covered witli short black hairs and a few spines ; 

 ground-colour dark-yellow. Wings slightly longer than the 

 abdomen, with a slight dusky tinge, covered rather sparingly 

 with black hairs. Veins dark-brown. A dark patch on the 

 anterior branch of second longitudinal, extending to posterior 



