778 CHARLES PAUL ALEXANDER 



chitinized apices to segments dark brown. Pupa most readily distinguished from pupa 

 of Bittacomorpha by the venation, the position of the tarsal sheaths, and the short, non- 

 stellate abdominal tubercles. (Plate XIV, 13.) 



Anterior cephalic crest small, deeply bilobed by a broad V-shaped notch, the rounded 

 lobules roughened and each terminated by a single long hair. Dorsad of these, two smaller 

 and slenderer, very widely separated, tubercles, each lying just inside antennal sheaths. 

 Antennal bases located on ventral side of head, between eyes; antennae bent dorsad and 

 thence caudad around knee joints of fore legs, the tips lying just outside middle tibiae; apical 

 antennal segments showing distinctly thru sheaths. Sheaths of maxillary palpi elongate, 

 tips curved over knee joints of fore legs. Clypeus smaller and narrower than the conspicuous 

 labium, transversely wrinkled. Labium rectangular, each half with tips obliquely truncated. 

 (Plate XIV, 14.) 



Pronotum with lateral ventral angles almost square, each with about two small setae. 

 Breathing horns very unequal in length; the right one greatly elongated, much longer than 

 remainder of body, enlarged at extreme base, the outer part with numerous papillae which 

 are more numerous and more approximated toward end of organ, these papillae lying in a 

 single straight line which makes a long spiral around organ; left breathing horn very small 

 and degenerate, only a little longer than sheath of maxillary palpi, curved, with about a 

 dozen papillae which are closely crowded toward apex of organ. Mesonotum finely and 

 transversely wrinkled, prescutum with a very acute V-shaped dorso-median mark, its apex 

 directed backward; scutal lobes projecting, each with a few tiny hairs. Postnotum with 

 two small tubercles at about two-thirds its length, one on either side of a pale median line. 

 Metanotum short, sheath of halteres extending just beyond base of second abdominal 

 segment. Wing sheaths clearly showing venation, the branched media being characteristic 

 of the genus; wing sheaths extending almost to end of second abdominal segment. Leg 

 sheaths with tips of fore and middle tibiae enlarged, and with inner apical angle of each 

 produced into long points for the long tibial spurs of adult flies. Leg sheaths extending to 

 just before end of third abdominal segment; all six legs lying side by side, not overlapping 

 as in Bittacomorpha (Plate XV, 21). 



First abdominal segment chitinized above, apical half with a few weak tubercles. Dorsum 

 of segments 2 to 6 with posterior margins each having a chitinized band set with about 

 twenty-five to thirty setiferous tubercles, the outermost ones being the largest; remainder 

 of dorsum of each segment with irregular transverse rows of scattered tubercles, on narrow, 

 interrupted, chitinized bands; usually one of the bands, at about midlength of segment, 

 broader and more strongly chitinized than the others; these bands obliterated on posterior 

 segments, but caudal band here very wide; about fifteen of these rows on segments 2 and 

 6, and from twenty to twenty-five rows on segments 3 to 5; these bands not regularly trans- 

 verse, but anastomosing rather freely, not occupying more than half of abdominal surface; 

 segment 7 with the broad caudal band only; tubercles rather short, with three or four short, 

 irregular spines at tip, these not presenting a stellate appearance as in Bittacomorpha. 

 Abdominal sternites similar to dorsum, tubercles lacking where leg sheaths rest against 

 segments 2 and 3; segments 4 to 6 with transverse rows similar to those of dorsum but 

 weaker; caudal bands on segments 4 to 7 very broad, the caudal margin with tubercles, 

 there being about twenty tubercles on segment 4, the number gradually decreasing to seg- 



