354 



UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



terior, and 3 ventral bristles; anterior femur with a 

 very long, dorsal and ventral fringe of fine, numerous 

 hairs which are shorter anteriorly and posteriorly ; tibia 

 with a triple row of dorsal bristles, 1 posterior row; 2 

 or 3 ventral and subventral elements and 1 anterior 

 row of bristles confined to the basal half only. The 

 apex of the anterior tibia bears 2 or 3 ventral, 1 long 

 dorsal, and 1 quite long, stiff, medial bristle but no 

 spine. Tarsi end in stiff, unswollen empodium, well 

 developed pulvilli, and sharp claws. 



Wings: the wings are slender; the marginal cell is 

 closed with a long stalk. The anterior branch of the 

 third vein ends before the apex of the wing, the 

 posterior branch far behind. The first posterior cell 

 is long and quite narrow, and narrowly open. The 

 fourth posterior and anal cells are each closed with a 

 long stalk. The discal cell appears to end with one 

 rectangular vein, as the lower component is quite long, 

 turned toward the base and lies parallel to the upper 

 margin of the discal cell. Alula large; ambient vein 

 complete. The base of the second submarginal cell 

 may have a spur vein, usually lacking. 



Abdomen: The abdomen is robust and flattened 

 across the middles of the tergites and more or less 

 tapered in females, the sides more nearly parallel in 

 males and never wider than the thorax. The pile is 

 very short and flat appressed over the greater middle 

 part of each tergite but generally long, fine and dense 

 on the sides. Sides of first tergite with 1 to 4 bris- 

 tles; sides of remaining tergites each with 1 to 3 stout 

 bristles but in some species they may be very weak 

 on the last two tergites. There are seven tergites in 

 the male, the last short; in the female seven tergites 

 also, the eighth more or less drawn out and included 

 in the ovipositor. Male terminalia rotate and dis- 

 tinctive in the relatively short but large, broad, slightly 

 flattened epandrium. The proctiger is exceptionally 

 long and appears to consist of two parts; the basal 

 section alone is almost as long as the epandrium and 

 nearly as wide. The terminal part is long, more nar- 

 row and spatulate ; it is intended that the basal half of 

 this conspicuous proctiger as described above should 

 be interpreted as being part of the epandrium and 

 only the apical, spatulate portion considered as proc- 

 tiger. Behind the bulbous, basal portion of the epan- 

 drium I can find the narrow seventh segment and an 

 additional strip, which represents either the eighth 

 tergite or the eighth sternite, probably the former ; one 

 or the other appears to be lost. Gonopod broadly 

 fused for a considerable distance on the base of the true 

 ventral aspect; claspers and pseudoclaspers appear to 

 be present; each may end in some species in a gro- 

 tesque, twisted plate ; laterally each gonopod has some 

 quite long, stiff bristles directed posteriorward. The 

 genital cavity is small and narrow. Aedeagus long, 

 narrow, slender and enclosed. 



Female terminalia also distinctive; the eighth seg- 

 ment is quite elongate and conical becoming laterally 

 compressed posteriorly ; the sternite extends slightly 

 farther and bears several stout, long bristles on each 



side; at the end of the eighth tergite the ninth is elon- 

 gate but only half as long as the eighth ; it is much 

 more narrow, of uniform width and a little compressed 

 laterally with truncate apex. 



Distribution: Neotropical: Neophoneus amandus 

 Walker (1849); ftavotibius Bigot (1878) [ = flaviti- 

 Ucdis Bigot (1879) flapsus, fiavipes Bigot (1880)]; 

 mustela Hermann (1912); servillei Macquart (1838). 



Genus Cerotainiops Cnrran 



Figures 227, 645, 1256, 1265, 1562, 1807, 1809, 2146, 2171 



Cerotainiops Curran, Amer. Mus. Novitates, no. 415, p. 11, 

 1930. Type of genus: Nusa abdominalis Brown, 1897, as 

 Cerotainiops rufiventris Curran, 1930, by original designa- 

 nation. 



Flies no greater than medium size, or smaller. They 

 are stout and robust, the abdomen comparatively short. 

 They are perhaps most readily recognized by the closed 

 first posterior cell with a long stalk, and the sigmoid 

 anterior branch of the third vein which ends far above 

 the wing apex, the costa ending almost at the same 

 point. The branches of the medius tend to be evanes- 

 cent; ambient vein absent or greatly reduced. Length 

 8 to 16 mm. 



Head, lateral aspect: The face is moderately devel- 

 oped, growing gradually a little more prominent be- 

 low; the eye is of moderate length, equally developed 

 above and below, strongly convex anteriorly, flattened 

 medially, gently convex behind and somewhat recessive 

 anteroventrally. The occiput is prominent only on the 

 lower half; completely obliterated on the upper third, 

 becoming very well developed below, due chiefly to 

 the eye recession. Pile of occiput abundant and coarse, 

 short above, becoming longer below and with compara- 

 tively few bristles. Near the upper comer of the eye 

 are 2 quite stout bristles and a close-set cluster of 3 

 stout bristles on each side behind the vertex. Pro- 

 boscis held straight forward; it is very strongly flat- 

 tened dorsoventrally ; from the side it is pointed at the 

 apex, greatly swollen towards the base, the apical 

 fourth has a number of stiff, bristly hairs above and 

 below; it is without pile otherwise, except for some 

 long, coarse hairs ventrally at the base. Palpus with 

 both segments excavated, the second is rather slender 

 and elongate and bears several, stout, apical bristles. 

 The antenna is attached at the upper fourth ; the first 

 segment is a little longer than the second. The third 

 segment is slightly longer than the first two, rather 

 thick and swollen laterally beyond the base ; beginning 

 at the base it expands quite extensively until almost 

 pear-shaped, then near the apex rapidly reduced to a 

 blunt point bearing a large, subdorsal, oval opening 

 with short, concealed spine. First segment with 1 ex- 

 ceptionally long, stout, ventrolateral bristle; second 

 segment with 1 moderately stout, long bristle. 



Head, anterior aspect : Face below antenna one-third 

 the head width. Subepistomal area moderately large, 

 a little oblique, nearly plane and bare. The face is 



