108 
ROWLAND E. TURNER 
other allied species it may be distinguished by the oblique and slightly 
concave truncation of the median segment. 
A male from the same locality probably belonging to this species 
differs from R. approximatus in the following details ; the vertex more 
sparsely punctured, abdomen almost without punctures, the lateral spines 
at the base of the hypopygium less developed, though quite distinct, 
and the second recurrent nervure received nearer to the base of the 
third cubital cell. 
Tachynomyia Mocsáryi sp. nov. 
cf. Clypeus produced and rather narrowly truncate at the apex, 
finely and shallowly punctured and thinly covered with white pube¬ 
scence, with a low longitudinal carina in the middle not reaching the 
apex, the apical margin smooth. Head rugosely punctured, more coarsely 
on the front than on the vertex, the interantennal prominence broad 
at the apex and feebly bilobed. Antennæ inserted much nearer to each 
other than to the eyes, longer than the head, thorax and median 
segment combined, the apical joints feebly arcuate. The pubescence on 
the sides of the head long and whitish; the posterior ocelli near 
together, about twice as far from the eyes as from each other. Prono- 
tum much narrower than the head, shining, sparsely and finely punc¬ 
tured, the anterior margin slightly raised. Mesonotum with the usual 
two longitudinal sulci on each side, rather strongly punctured, the 
scutellum a little more sparsely punctured and shining. Mesopleuræ 
closely and shallowly punctured ; the median segment longer than the 
mesonotum, more closely and finely punctured than the thorax and 
smooth at the extreme apex. Abdomen shining, shallowly punctured, 
flattened, narrowed at the extremities ; the basal segment much longer 
than the breadth at the apex, with a sulcus from the base nearly 
reaching the apex, the second segment transversely depressed at the 
base. Hypopygium prominent, strongly narrowed near the base, then 
gradually broadened to the apex, vTiich is strongly emarginate on each 
side of the long apical spine, the apical angles produced into shorter 
spines. 
Black; the apical margin of the clypeus, the base of the man¬ 
dibles, the apex of the interantennal prominence, a narrow 7 transverse 
line on each side of the anterior margin of the pronotum and a small 
spot on the middle of the postscutellum pale yellow; the tegulæ and 
the posterior margin of the pronotum testaceous ; the second and third 
abdominal segments, the sides of the fourth, the extreme apex of the 
