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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



terminal process. Gonopod smaller but prominent. 

 Aedeagus tubular at apex. All three divisions of the 

 terminalia tend to be divergent dorsoventrally, leaving 

 clefts between them. Female terminalia deeply recessed 

 within the overhanging, hoodlike or shieldlike eighth 

 tergite; the only structure, which can be discerned 

 within this cavity is the spatulate, pilose, apical proc- 

 tiger. After examining many females, I can find no 

 evidence of acanthophorites or spines. 



Distribution : Australian : A-plestobroma avida Hull 

 (1957). 



Genus Broticosia Hull 



Figures 12, 408, 841, 850, 1653, 2244, 2247 



Broticosia Hull, Psyche, vol. 64, no. 3, p. 91, 1957. Type of 

 genus : Broticosia rapax Hull, 1957, by original designation. 



Rather smaller than medium size and slender flies 

 with long, somewhat compressed abdomen. They are 

 immediately recognized by the circular head, the ex- 

 tremely narrow face, which carries a dense, narrow, 

 vertical band of long, matted, bristly pile extending 

 from the antenna to the gibbosity and then extending 

 down over the gibbosity to form an especially dense, 

 matted, triangular tuft. Related to Aplestobroma Hull 

 through the similarly produced hypandrium. Length 

 13 to 15 mm. 



Head, lateral aspect : The upper three- fourths of the 

 face is nearly plane with the eye level; on its lower 

 portion the face presents a low, rounded retreating 

 elevation not extending forward beyond the upper 

 plane of the face. The eye is long, strongly convex 

 anteriorly, nearly plane through the middle portion 

 behind, and not recessed. The occiput is moderately 

 thick and continues undiminished to the upper por- 

 tion of the head where it slopes gradually to the eye 

 margin. Pile of occiput extremely long, fine, and mat- 

 ted dorsally, and extending far above the vertex and 

 mesonotum; the individual hairs are three- fourths as 

 long as the antenna. Pile along the middle of the 

 occiput also long, fine and bristly and directed outward, 

 but less abundant. Ventral pile shorter but abundant 

 and matted, true bristles are absent. The proboscis is 

 small, short, gradually swollen towards the stout base; 

 it is dorsoventrally depressed towards the apex and 

 therefore in profile appears rather narrow apically 

 and especially tapered and oblique on the lower portion. 

 This lower portion bears laterally some long, stiff setae, 

 but only a few minute hairs dorsally at the apex ; the 

 base ventrally has a number of long, slender bristles 

 directed obliquely forward, together with weaker hairs. 

 The proboscis is directed obliquely downward. The 

 palpus is distinctly composed of two segments, the 

 second segment generally held at nearly a right angle. 

 The first segment is short, distinctly hemicylindrical 

 and excavated, pilose below. The second segment is 

 club-shaped, relatively short, narrowed basally and 

 carries a number of long, stiff bristles ventrally and 

 apically. It appears to lack a pore. 



Antenna attached at the upper fifth of the head, un- 

 usually slender and distinctly longer than the head. 

 The first two segments combined are as long as the 

 third segment, its microsegment excluded. The second 

 segment is two-thirds as long as the first segment and 

 apically widened. Third segment quite slender, a lit- 

 tle swollen at the immediate base and slightly tapered 

 just before the apex which is venti'ally and obliquely 

 truncate. This segment carries a long microsegment 

 held at a slight angle, the microsegment is approxi- 

 mately a little less than one-third as long as the third 

 segment, and at its apex it has a ventral, spoonlike or 

 hoodlike extension which contains a long, dorsal, 

 spinous bristle. Pile of the first antennal segment 

 confined almost entirely to the ventral surface with 

 no dorsal pile; it carries a dense, exceptionally long 

 fringe of stiff, bristly hairs fully as long as the third 

 antennal segment. This fringe is more or less matted 

 and extends from base to apex. Apex of second seg- 

 ment with fine, long setae above and 6 long, stout bris- 

 tles below, matted and similar to those of the first 

 segment. 



Head, anterior aspect: The head is nearly circular. 

 The face width below antenna is one-tenth the head 

 width, widening below to nearly one-third. The sub- 

 epistoma is short, oblique and nearly plane. Face with 

 a narrow, vertical, dense, matted band of exceptionally 

 long, slender, bristly pile, extending from the antenna 

 to the upper slope of the low gibbosity. This pile is 

 nearly as long as the antenna and might be described 

 as weak bristles. On the gibbosity there is medial, 

 similar, bristly hair which extends out over the whole 

 surface, except its lateral margin, but comparatively 

 long, because of the length of the head, and is only 

 a little wider than the upper face. The sides of the 

 front have dense, long, matted pile similar to that on 

 the face, but only a little longer than the length of 

 the first two antennal segments. The vertex is scarcely 

 excavated, the ocellarium large, low, with swollen ocelli 

 and bearing a number of fine, long, bristly hairs. An- 

 terior eye facets slightly enlarged. 



Thorax : The thorax is densely, coarsely micropubes- 

 cent. The mesonotum is only abrupt anteriorly, but 

 has a rather high, slightly narrowed and arched appear- 

 ance. Cover of mesonotum consists of numerous, very 

 long, fine bristles down the middle of the mesonotum 

 and some shorter bristles submedially. The acrostical 

 bristles are numerous, long and slender and subap- 

 pressed, the dorsocentral bristles are short on the ante- 

 rior third, becoming extremely long and numerous 

 opposite the wing and near the postalar callosity, 

 changing from a narrow, double row to spread out over 

 the entire prescutellar area. Humerus short, fine, ap- 

 pressed pilose, with a few scattered, erect hairs. Lat- 

 eral margin of the mesonotum with many moderately 

 long, fine, erect, bristly hairs. The notopleuron with 

 2 long, slender bristles, the supraalar area with 1, the 

 postcallosity with 2 or 3 bristles, the scutellum with a 

 wide band containing many rows of extremely long, 



