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UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



PAP.T 1 



and posterior pair of long, divergent, black, exception- 

 ally stout, tuberculate bristles. 



Thorax : The mesonotum only moderately convex, the 

 humerus with 4 medium stout bristles placed in a row, a 

 single row of minute, submicroscopic, acrostical bristles. 

 Also, beginning adjacent to the humerus and placed on 

 the outer third of the mesonotum, there is a row of 6 

 quite stout, black bristles, 4 of which are placed anterior 

 to the suture. There is a row of minute, fine, long hairs 

 above the quite flattened scutellum. Scutellum with 

 a pair of very strong, quite long, widely separated, 

 stout, tuberculate, black bristles. Postalar area with 

 2 even stouter and longer black bristles. The noto- 

 pleural area with 3 almost equally stout, long, black 

 bristles. The supraalar area has 2 similarly long, stout 

 bristles. The mesonotum is otherwise bare, except for 

 a few minute, scattered hairs above the postalar region 

 and medial to the humerus, and with a patch of 6 

 minute, black bristles on the notopleuron. Pleuron 

 pollinose, with very fine, long pile along the posterior 

 border of the mesopleuron and its lower central portion 

 but scanty in quantity. Propleuron pilose; pronotum 

 with 7 or 8 moderately long, stiff, pale yellow hairs. 

 Hypopleuron bare except for long and short pubescence. 

 Metapleuron convex with a vertical row of 5 or 6 rather 

 weak, moderately long, pale bristles. Metanotal slopes 

 strongly bullose, pollinose, but distinctly without pile. 

 Lateral metasternum with numerous fine, erect hairs. 

 Postmetacoxal area membranous. 



Legs: Posterior femur elongate and moderately 

 slender with minute, fine, short, appressed setae 

 laterally, dorsally, but almost bare ventrally and upon 

 the lower half of the medial surface. There is a minute, 

 black bristle laterally near the base on one side of one 

 femur but it is absent on the other femur; otherwise 

 bristles are completely absent on the femur. This 

 femur is only very slightly more slender on the basal 

 fourth. Hind tibia bears strong, stout bristles : 3 dor- 

 sally, evenly spaced, 4 laterally, and 3, beginning just 

 before the middle, placed on the lateral portion of the 

 ventral surface. There are none medially but the 

 dense, minute, appressed, golden pile often found on 

 the medial surface begins at the middle. At the apex 

 are 1 dorsolateral, 1 lateral, 1 weak medial bristle, and 

 a cluster or row of 3 strong, ventral, black, spinose 

 bristles. Hind tarsus with the basitarsus elongate, 

 nearly equal in length to the three remaining segments 

 with prominent bristles below and a circlet of 6 bristles 

 at the apex. Middle femur with only minute, ap- 

 pressed setae and a single, rather stout, black bristle 

 posteriorly near the apex. There is 1 long, fine, yellow 

 hair ventrally near the base. Middle tibia with 3 long, 

 stout, anterolateral bristles, the basal one shorter, the 

 middle one yellow and with 2 quite long, oblique, quite 

 stout, ventral yellow bristles near the basal and distal 

 thirds. Apex with a stout, yellow bristle and a black 

 bristle both located below, 2 short, black bristles above, 

 a long black bristle anteriorly. 



Anterior femur similar to the middle pair but with 2 

 anterodistal, black bristles; its tibia has 4 minute black 

 bristles anteriorly, 2 longer bristles dorsally and 1 short 

 and 1 quite long, posterior bristle, which is yellow, at 

 basal and distal thirds. The apex bears rather stout 

 bristles placed a short distance back from the apex. 

 There are 2 dorsal, 1 exceptionally long anterior, 1 

 shorter posterior and 1 ventral ; its tarsus has a similar, 

 long, stout, posterior, basal bristle and a circlet of 

 bristles at the apex. No spine or spur at the apex of the 

 anterior tibia. Claws sharp ; pulvilli four-fifths length 

 of claw ; empodium long. 



Wings : The wings are rather slender ; marginal cell 

 closed with a stalk ; fourth posterior cell closed with a 

 stalk; anal cell very narrowly open; alula well devel- 

 oped, ambient vein complete. 



Abdomen: The abdomen is tapering and subcylin- 

 drical on the distal half, the base moderately convex 

 and becoming strongly curled laterally. Posterior mar- 

 gins of first segment laterally with a fan of 5 moder- 

 ately stout, pale bristles. Remaining segments with 

 only microscopic, subappressed, black setae, rather 

 scanty in quantity. The sides of all except the last ter- 

 gite are pollinose; the medial areas are opaque black, 

 but faintly shining on the sixth and quite sliming on 

 the seventh tergites. Females with the last tergite 

 shining, rather long, divided into acanthophorites and 

 bearing on each side a clawlike cluster of very stout, 

 curved, lateral spines. These spines have much more 

 depth than usual and are spikelike, hence rather unlike 

 those of any other genus known to me. Sternites with 

 a few long hairs on the basal 2 sternites, the remainder 

 with only scattered microscopic setae. Males are un- 

 known. The Hermann collection and the Vienna collec- 

 tion each contain a female. 



Distribution: Neotropical: Enigmo?norpheus para- 

 doxus Hermann (1912). 



Genus Metalaphria Ricardo 



Figures 98, 164, 578, 1163, 1172, 1776, 1793, 1846, 1953 



Metalaphria Ricardo, Ann. Mag. Nat. Hist., ser. 8, vol. 10, p. 356, 

 1912. Type of genus : Metalaphria australis Ricardo, 1912, 

 by original designation 



Medium size, pollinose flies with minute, scanty, ab- 

 dominal pile and scattered, mesonotal setae. Bristles 

 are strong but few. The related Thcreutria Loew has 

 long, appressed, abdominal setae, is generally black in 

 color with shining abdomen. Also the two genera 

 differ in the antenna and proboscis. In TTxereutna the 

 third antenna! segment is longer and more slender and 

 the apex of the proboscis is wider from the dorsal as- 

 pect and distinctly depressed and shovellike dorsoven- 

 trally; face much longer. Both genera have the mar- 

 ginal cell closed and short petiolate, the posterior cells 

 open but the fourth narrowed, and the anal cell open 

 or closed in the margin. Male terminalia rotate ; the 



