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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PART 1 



proctiger and has a medial, scoop-shaped process. 

 Hypandrium moderately large, convex and rounded 

 posteriorly. Female terminalia with acanthophorites 

 and 6 pairs of long, bluntly rounded, spatulate, spoon- 

 like spines. 



Distribution : Australian : Apothechyla carlo Walker 

 ( 1851 ) . I have seen an additional, undescribed species 

 which belongs in this genus. 



Stizochymus, new genus 

 Figures 155, 560, 1087, 1096, 1704, 1705 



Type of genus: Dasypogon salmator Walker, 1849. 



Large, stout flies with tapered, cylindroid abdomen 

 and long, stout bristles. The base of the second pos- 

 terior cell is quite strongly arched and wide. The 

 fourth posterior cell is open but narrowed. Face 

 strongly convex above with a prominent, ventral, trans- 

 verse crease as in Microstylum Macquart. Pile absent 

 and mystax restricted to 2 close-set rows of bristles 

 above the epistoma. The dorsocentral bristles before 

 the suture consist of fine setae. Scutellum with stout, 

 long bristles. Male epandrium short and cleft to the 

 base. Third antennal segment without microsegment. 

 These flies differ from Neosaropogon Ricardo in the 

 radically different character of the palpus and the pro- 

 tibial protuberance and spine, besides differences in 

 the venation and antenna and scutellum. Length 

 26 mm. 



Head, lateral aspect : The face is moderately promi- 

 nent, distinctly convex above, and slightly concave 

 on the lower fifth, which is set apart by a shallow, 

 transverse crease. The occiput is moderately promi- 

 nent but only at some distance from the eye margin, 

 to which it slopes very gradually and the pile and bris- 

 tles are likewise rather deep-set medially. Actual ocu- 

 lar portion of the occiput is concave laterally and 

 above. The pile is fine to coarse, moderately long and 

 abundant on the lower fifth of the head, with a row 

 of weak bristles laterally and some stronger elements 

 dorsally and deeply placed behind the vertex. Probos- 

 cis large, compressed laterally, with a strong medial 

 ridge dorsally on the basal half. The lower surface 

 is nearly plane, the immediate apex dorsally is tapered 

 to a blunt point and bears bristly hairs on either side 

 and a row of stiff hairs divergent on each side of the 

 ventral margin and confined to the outer third. Sides 

 of the basal portion with some very long hairs. Palpus 

 clearly of two segments ; first excavated, second short., 

 robust, obtusely rounded at apex, with many, long, 

 slender bristles and bristly hairs on all sides. The 

 antenna is attached at the upper third of the head ; the 

 first segment is about twice as long as wide, with setae 

 above and below; the second is a little longer than 

 the first, with numerous setae above and 3 short and 3 

 stout, longer, apical, ventral bristles. Third segment 

 as long as or a little longer than the combined length 



of the first two segments, slightly widened in the 

 middle and without a microsegment at the apex. 



Head, anterior aspect: The head is not quite twice 

 as wide as high, the face about one-fourth the total 

 head width and very slightly wider below. Cheeks 

 rather short, the concave subepistoma is large. The 

 face surface consists of very dense, appressed, pale 

 micropubescence with pile absent. There are 2 rows of 

 quite long, stout, yellowish white bristles just above 

 the epistoma. Together they contain about 26 ele- 

 ments, a few of which are slender. They extend nearly 

 to the end of the proboscis and there are none along 

 the sides of the epistoma. Front large, shallowly con- 

 cave, densely pubescent, without pile or bristles and 

 slightly wider than the upper face. The ocellarium is 

 moderately large, with quite large ocelli, steep sides, 

 enclosed pollen and a pair of stout, pale bristles di- 

 rected forward and attached between the posterior 

 ocelli ; behind the ocelli are a few setae, and the sides 

 of the vertex have 3 stout setae each. Anterior eye 

 facets strongly enlarged. 



Thorax: The thorax is large, with the mesonotum 

 moderately high, abrupt anteriorly, and only slightly 

 convex. It is also abrupt in front of the scutellum. 

 Disc of scutellum pollinose, mostly dark with extensive, 

 bare areas laterally. There is a widely segregated row 

 of acrostical setae ; dorsocentral setae are short over the 

 middle, scattered anteriorly toward the sides and in- 

 clude posteriorly 2 or 3 quite long, stout bristles in each 

 row. Lateral mesonotal bristles especially stout and 

 long. There are 3 or 4 notopleural elements in a row 

 extending towards the humerus and 3 supraalar, with 

 the first element longest and preceded by a patch of 

 erect, small bristles. Postalar callosity with 2 very 

 large and 1 small bristle and the scutellar margin with 

 a pair of widely separated, quite stout, long bristles. 

 Scutellum flat, pollinose with a single, small bristle on 

 each side near the base. Metanotal callosity protu- 

 berant and only pollinose. Pleuron densely pollinose, 

 mostly without pile. Pronotum with 6 pairs of weak 

 bristles, shallowly silicate in the middle and deeply 

 separated from the posterior section. The lateral pro- 

 pleuron has 2 stout bristles and numerous, long hairs. 

 Humerus with coarse hairs only. Metapleuron with 

 a vertical row of 9 bristles. Postmetacoxal area 

 membranous. Prosternum fully dissociated. Anterior 

 basalare with numerous, bristly hairs. 



Legs : The femora are quite stout without being swol- 

 len and are only moderately long. The hind femur 

 is slightly wider distally. Dorsally the femora bear 

 dense, appressed setae or bristly hairs but tend to be 

 bare on the posteroventral surface, with only scattered 

 hairs. Bristles stout, not very long, few in number. 

 The hind femur bears 3 lateral bristles, 2 of them be- 

 fore the middle, and near the apex is 1 dorsomedial 

 bristle. Hind tibia has longer bristles, 2 dorsolateral, 

 1 of which is situated at the basal third, the other at 

 the distal third; quite close to the base are 2 nearly 



