422 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



of long, slender, bristly hairs. Metasternum laterally 

 and ventrally with abundant, long pile. Postmetacoxal 

 area membranous. Presternum fully dissociated. 



Legs: The legs are comparatively slender, the hind 

 femur and tibia are lengthened, the pile reduced to a 

 few, fine, scanty hairs and bristles rather reduced in 

 number but stout and sharp. The hind femur has 4 or 

 5 lateral bristles, 3 prominent, medial bristles in the 

 middle, and the apex has 1 lateral and 1 dorsal pair. 

 Hind tibia enlarged at apex with 1 stout, dorsal, basal 

 bristle and 2 or 3 weak bristles beyond, and with 2 to 3 

 stout, lateral and 2 similar ventral bristles. Middle 

 femur with anteriorly and posteriorly 3 or 4 short but 

 stout bristles which may be increased to 5 to 7 in fe- 

 males. Ventral surface of males with scattered fringe 

 of long hairs basally and females with 1 stout basal 

 bristle. Anterior femur with 2 or 3 short, anterior and 

 a like number of posterior bristles in females, and the 

 number apt to be reduced in males to 1 on either side 

 near the apex. Middle tibia with 2 or 3 long, stout 

 bristles anteriorly, 1 or 2 anteroventrally, 1 ventrally at 

 the apex, 2 posterodorsal and 7 or 8 short, posterior 

 bristles; all are stout and spinelike. Anterior tibial 

 bristles quite short, with 3 to 5 in each row; they are 

 longer in females. Protibial apex with 1 long, stout 

 protuberance medially beset with bristles and carrying 

 a stout, curved, clawlike spine. Basitarsus with a 

 prominent basal flange. Claws comparatively sharp, 

 strongly bent at the apex; pulvilli large; empodium 

 bladelike. 



Wings: The wings are elongate, the marginal cell 

 open but not widely. The fourth posterior cell closed 

 with short stalk, the anal cell likewise. The alula is 

 quite large; ambient vein complete. 



Abdomen : The abdomen is elongate, a little shorter 

 than the wings, subcylindrical, not quite as broad as 

 the mesonotum, and in males slightly clavate, due 

 largely to the wide and prominent terminalia. The ab- 

 domen is often pollinose, sometimes pale in part. The 

 dorsal pile consists of fine, scattered setae, the lateral 

 pile of long, fine hairs. Only the first tergite has bris- 

 tles which consist usually of 3 stout, lateral elements. 

 Males with 7 tergites, females with 8, the latter de- 

 pressed from the seventh but otherwise prominent. 

 Male terminalia enlarged and fully rotate, the epan- 

 drimn is broad, conspicuous, uncleft, but often with a 

 long, fingerlike, distal protrusion. It appears to be 

 fused laterally with the rather large, broad, triangular, 

 upturned hypandrium and medially there is a faint, 

 longitudinal line which suggests a point of former 

 fusion. The gonopod is bulging, convex, swollen 

 basally with a dorsal, conspicuous, elongate, somewhat 

 spoonl ike process which parallels the elongate process of 

 the epandrium and the equally long dorsal proctiger; it 

 is set off from the epandrium by a deep crease. Aedea- 

 gus large, exposed, hooklike, undivided. In the female 

 terminalia the ninth tergite consists of a short, broad, 

 gently rounded plate with a medial crease. Eighth 

 sternite large, flat, widely depressed over the middle 



part. Seventh sternite with many, long, curved, stout 

 bristles directed downward. 



Distribution: Neotropical: Senobasis almeidai Car- 

 rera (1946) ; analis Macquart (1838) ; apicalis Schiner 

 (1867); boraceana Carrera (1952); bronileyana Car- 

 rera (1949) ; claripennis Schiner (1867) ; claviger Ron- 

 dani (1850); corsair Bromley (1951); flukei Carrera 

 (1952); frosti Bromley (1951); gyrophorus Schiner 

 (1868) ; lanei Carrera (1949) ; lopesi Carrera (1949) ; 

 mendax Curran (1934) ; mundatus Wiedemann (1828) ; 

 nigriventris Bigot (1878) ; onwtus Wiedemann (1819) ; 

 rhombungulata Carrera (1949) ; staurophorus Schiner 

 (1868); tibialis Curran (1934); weyrauchi Carrera 

 (1952). 



Genus Pronomopsis Hermann 



Figubes 240, 666, 1238, 1247, 2105, 2144 



Pronomopsis Hermann, Nova Acta Acad. Caes. Leop.-Carol., 

 vol. 96, p. 18, 1912. Type of genus : Pronomopsis chalybea 

 Hermann, 1912, by original designation. 



Large robust flies of brown or blue black color. 

 Wings dark brown, the face prolonged into a curious, 

 ventrally sharp, beaklike extension which readily char- 

 acterizes them. Third antennal segment strongly di- 

 lated except at the base. Length 15 to 20 mm. 



Head, lateral aspect : Head extremely long, including 

 the face; the eye is of medium length, the occiput only 

 moderately thick submedially and least prominent near 

 the vertex. The occipital pile is coarse and abundant; 

 bristles begin at the middle of the head and consist of 

 1 row of very slender, more or less proclinate elements. 

 Proboscis long, strongly compressed laterally, arched 

 above, slightly concave below; the apex is bluntly 

 pointed; there is a prominent, medial carina over the 

 middle third and the whole structure is extended well 

 beyond the face. Palpus large, long, cylindrical and 

 slightly sigmoid; it is nearly half as long as the probos- 

 cis and consists of 1 segment with numerous, basally 

 stout bristles at the apex and ventral surface and bristly 

 pile dorsally. The antenna is attached at the upper 

 fifth of the head. It is about iy 2 times as long as the 

 eye, the first two segments robust, the second shortest, 

 the third IV2 times as long as the first two, strongly at- 

 tenuate near the base, widely dilated on the remainder, 

 and widest on the outer third. This segment bears a 

 short, conical, spine-tipped microsegment. First and 

 second segments with numerous, long, bristly hairs on 

 all sides, except the middle; the middle of the second 

 segment above has at least 1 long, stout bristle. 



Head, anterior aspect: The head is wide, the face 

 unusually wide and more than one-third the head 

 width; it is a little divergent below; there is a large, 

 medial triangular area, the base of which is turned to 

 the antenna, which is without pile or bristles. Sides of 

 the face with numerous, slender bristles becoming a 

 little stouter below and with a considerable amount of 

 bristly pile. Subepistomal area of moderate size, not 

 extending over the ventral surface of the beak, concave 



