Marshall. — On Neto Zealand Diptera. 307 



small. Thorax strongly curved. Abdomen compressed later- 

 ally, with six segments in the female. Legs moderately long, 

 rather slender ; femora compressed ; tibias of anterior legs 

 without spines, posterior and intermediate tibiaB with a few 

 very weak spines ; spurs rather long and slender ; tarsi 

 slender, first joint more than twice as long as any of the 

 succeeding joints. Wings rather shorter than the abdomen, 

 microscopically pubescent. Auxiliary vein short, ending in 

 the costa ; first longitudinal ending in the costa at a point 

 more than two-thirds of the length of the wing ; second longi- 

 tudinal vein joining the tip of the costa before the apex of the 

 wing ; inner marginal cell rather lengthened, but its apex 

 lies before the apex of the fork of the third longitudinal vein ; 

 inner marginal cell not quite closed, as marginal cross-vein is 

 not perfect ; petiole of third longitudinal vein not very short ; 

 fourth longitudinal vein with very acute fork, the apex of the 

 second posterior cell lying some distance before the apex of 

 the second submarginal cell ; fifth longitudinal vein incom- 

 plete, ending just beyond the apex of the fork of the second 

 posterior cell. 



The character of the autennge and of the tibiae I think 

 justify me in establishing a new genus for this species. I 

 have, so far, specimens of but one species. 



Brevicornu flava, sp. nov. Plate XII., fig. 4 ; Plate XIII., 



fig. 20. 



Length of antenuse, 0-020; size of body, 0-100 x 0-021 ; 

 expanse of wing, 0-088 x 0-033. 



Antennae short ; joints of scapus bright-yellow with black 

 hairs, about equal in length ; joints of flagellum dark-brown, 

 covered everywhere with a short dense pubescence giving 

 silvery reflections ; joints of about equal length, but the basal 

 joints have a breadth about three times their length, while 

 those near the apex are nearly as long as they are broad ; 

 terminal joint longer than broad, subconical. A small black 

 patch round both ocelli. Front dark-brown, almost black. 

 Vertex brownish-orange, with scattered hairs about the same 

 colour. Palpi pale-yellow. Thorax dark-yellow, covered with 

 long dark-brown hairs and shorter yellow hairs. Scutellum 

 dark-yellow, fringed with long black hairs. Metathorax and 

 pleurae dark-yellow\ Halteres yellow, small, covered with 

 short pubescence. Abdomen greatly compressed, yellow, but 

 darker on the posterior portion of each segment ; terminal 

 segment nearly black ; all segments covered sparingly with 

 short black hairs. Legs moderately long, rather slender ; 

 coxae pale-yellow, with a few setag near the end ; femora 

 yellow, rather robust, covered with short black hairs ; 

 tibia straw-colour, with longitudinal rows of short black 



