South African Hi/jlier MyoJarii (Diptera Calyptratae) . 479 



STUBMIA (ARGYROPHYLAX) DILABIDA, n. sp. 



This species has with 8. atropivora E. D., which also occurs at the 

 Cape, several characters in common, viz. : head broad, with 2 rows of 

 frontal setae ; antennae of similar shape ; 4 steuopleural setae ; 6 mar- 

 ginal setae on the third abdominal segment. 



It differs by the ocellary setae which are inserted on each side of 

 the inner ocellus (it is in front of the ocellus in 8. apivorcC) ; by a 

 row of small black setae situated at the back of the ciliae on the 

 upper occiput (they are wanting in 8. atropivora) ; by the antenna! 

 chaeta, which thickens as the one half only; by the colouration, which 

 is light ashy, slightly fiavescent ; thorax with 4 narrow black lines, 

 the outer ones semi-colon-shaped ; abdomen less massive, narrower, 

 thinly and transversely banded with black, the last segment broadly 

 black at apex. The hind part of the orbits and the ocellary space 

 also ashy flavesceut. Scutellum partly reddish. Palps cylindrical, 

 blackish, arcuate and often reddish at the tip. Wings with the 

 cubitus of the 4th nervure straight or hardly obtuse, the apical curved 

 near the cubitus only, the hind transverse siuuose at base and thence 

 nearly straight, remote from the elbow ; costal spine wanting, one 

 single cilia at the root of the 3rd nervure. Squamae whitish ; halteres 

 dark, testaceous at base. Legs black, fore claws of the $ moderately 

 elongate ; hind tibise ciliate, and with a median interposed seta. The 

 chaetotaxy is the same as for 8. atropivora B. D. 



Length 8 mm. 



Natal, Durban, S. Afric. Museum. 



GEN. SEEICOPHOEOMYA Aust. 



The genus SericopJioromya Aust. includes species which differ from 

 the genus Winthemia E. D. only by their larger size (about 12 mm.), 

 and especially by the minute claws of the anterior tarsi of the $ ; the 

 abdomen is yellowish red on the first two segments, a medio-dorsal 

 black band crosses the second segment ; this baud is sometimes narrow 

 (8. marshalli u. sp.), but oftener it becomes a triangular spot 

 (8. quadrata Wiecl. ; S. claripilosa A.ust. ; 8. ruficrura n. sp.). The 

 thorax is noticeable owing to the abundant fiavescent, woolly villosity, 

 always to be found on the pleurae, but invading thence the tergum, 

 scutellum, and abdomen in S. quadrata Wied. ; or restricted on the 

 dorsal side to the hind border of the thorax, the scutellary calluses 

 and the sides of the scutellum in 8. claripilosa Aust., in which it 

 extends to the ventral surface of the abdomen and on the sides, and 

 also on the inferior edge of the femora. 



