Itttle-known S/^ecies of Thynu'iJise, 137 



species are quite distinct, the hygopygium of T. vulpina 

 being broadly subtruncate at the apex, in addition to the 

 difference in colour of the legs and wings ; the abdomen is 

 rather more shallowly punctured. The female described by 

 me is that of true moerehs. 



Tachynomyia megacephala, sp. n. 



^ . Clypeus finely and closely punctured, the apical margin 

 broadly smooth, a carina from the base not reaching the 

 apex, narrowly produced and truncate at the apex. Head 

 very large, broad and massive, deeply concave beneath, with 

 a fringe of long, curved, pale fulvous hairs on the sides ; the 

 prominence between the anteiuise broadly truncate at the 

 apex, not bilobed ; the antennse inserted farther from each 

 other than from the eyes, the scape scarcely longer than the 

 two basal joints of the flagellum combined. The head is 

 shining, deeply, but not very closely, punctured ; the posterior 

 ocelli three times as far from the posterior margin of the 

 head as from each other and more than half as far again 

 from the eyes as from each other. Thorax closely and 

 rather finely punctured, much more sparsely and coarsely on 

 the disc of the mesonotum and scutellum ; the pronotum 

 narrower than the head, the anterior margin slightly raised 

 and thickened, the scutellum strongly convex and raised 

 above the mesonotum, rather short and broadly truncate at 

 the apex ; the mesonotum is broad, measuring nearly 3 mm. 

 between the tegulaj. Median segment and pleurae opaque, 

 finely and very closely punctured, the median segment 

 rounded, with an almost obsolete sulcus from the base. 

 Abdomen smooth and shining, fusiform ; the basal segment 

 half as broad at the apex as long, very narrow at the base, 

 the second segment twice as broad at the apex as the first, 

 slightly depressed at the base, the two apical segments 

 sparsely punctured. Hypopygium short, projecting very 

 little beyond the epipygium, triangular, produced at the apex 

 into a short, blunt spine, the basal angles with a small acute 

 spine. 



Black ; the apex of the clypeus, a narrow line on the apex 

 of the interantennal prominence, the anterior margin of the 

 pronotum narrowly interrupted in the middle, the tegulae and 

 the postscutellum pale yellow. Wings fusco-hyaline, darkest 

 towards the apex, the posterior wings subhyaline ; nervures 

 black. The pleurse and median segment thinly clothed with 

 rather long white pubescence. The tibiae without spines on 

 the outer margin. 



Length l-i mm. 

 An7i. ct' Mag. X. Hist. Ser. 8. Vol. iii. 10 



