MR. R. SHELFORD ON A NEW GENUS OF DIPTERA. 151 



third joint. The [remaining joints form a slender flagellum, the last joint 

 being very long and lash-like. 



The mouth-parts are much reduced and consist of (1) a trapezoidal and 

 strongly deflexed labrum : (2) a pair of two-jointed maxillary palpi, the first 

 joint mintite, membranous, the second elliptical, hirsute ; (3) a minute, mem- 

 branous hypopharynx with a bifid apex directed inwards and overlying the 

 entrance to the pharynx (PI. 22. fig. 5). There is no labium. 



Thorax of three segments : the pronotum large and crescentic ; the meso- 

 notum lenticular in outline ; the metanotum with the anterior margin concave, 

 the posterior margin straight. The mesonotum is enclosed between the pro- 

 and metanotum and fails to reach the lateral margins of the thorax ; the 

 lateral borders of the other thoracic tergites overlap on to the ventral surface. 

 Ventrally the cuticle is thin and membranous and only shows faint traces of 

 fiternal sclerites ; a fine suture runs down the middle line of the ventral surface. 

 An inwardly-directed seta springs from the antero-lateral margin of the 

 pronotum. 



Abdomen of four segments ; the first three tergites transverse and shorter 

 than the last which is subtriangular : the lateral borders of the first three 

 overlap on to the ventral surface, which is covered with a thin, membranous 

 cuticle showing no signs of segmentation. 



Legs. — \st j^air. Coxse elongate, broad, flattened, the coxal cavities small, 

 circular and widely separated ; femora flattened, about equal in length to the 

 coxse but narrower ; tibiee almost cylindrical, about | length of femora, with 

 one spine at the apex ; tarsi 5-jointed, the last joint with two claws, no 

 pul villi. 



27id 2^ccir. Coxse trapezoidal, excavate and flanged on the outer aspect ; 

 femora longer and broader than those of the first pair, their lower margin 

 sinuate towards apex ; tibise cylindrical, equal in length to the femora, with 

 three spines at the apex ; tarsi similar to the first pair but more spinose. 



^rd pair. Coxse narrower and more elongate than the preceding pair ; 

 femora broader ; tibise tapering from apex to base, with six spines at the 

 apex ; [tarsi missing] . 



M. AFRiCANUS, sp. nov. (PI. 22. figs. 1 & 2.) 



Depressed, convex above. Piceous above, pale testaceous below ; antenna 

 pale testaceous. Minutely punctate above and with a fine recumbent 

 pubescence which extends also on to the legs. 



Total length 2*5 mm. 



Hah. Kisumu, Victoria Nyanza, Brit. Central Africa (Ch. AUuaud, 1904). 

 Type in the Paris Museum. 



I cannot be certain of the sex of the specimen, but suppose it to be a 

 female ; the unique specimen of urEnigmatias hlattoides is considered by 

 Meinert to be a female, though Coquillett [5] throws doubt on this and 



12* 



