182 PROCEEDINGS OF THE NATIONAL MVSEUiM. vol.49. 
The Sumatran Prionota Jlaviceps Enderlein ^ is quite distinct from 
nigriceps, which is a much larger species with a different body and 
wing coloration. It may be that flaviceps is not a true Prionota 
since it was erected on a single female specimen, in which sex the 
true characters of the genus are not well shown. 
Genus CTENACROSCELIS Enderlein. 
Ctenacroscelis Enderlein, Zool. Jahrb., vol. 32, pt. 1, 1912, pp. 1, 2. 
— — ' CTENACROSCELIS PRAEPOTENS Wiedemann. 
Tipula praepotens Wiedemann, Aussereur. zweili. Insekt., vol. 1, 1828, p. 40. 
Two females, Mount Salak, Java, May 15, 1909; one female, 
Pelaboean Ratoe, Java, October, 1909 (Bryant and Palmer). The 
specimens measure as follows: Length, 40 mm.; wing, 38-40 mm. 
The wing is shown in plate 45, fig. 35. 
— >• CTENACROSCELIS MONOCHROUS Wiedemann. 
Tipula monochroa Wiedemann, Aussereur. zweifl. Insekt., vol. ] , 1828, pp. 41, 42. 
A male and a female, Mount Salak, May 15, 1909; a female, Pela- 
boean Ratoe, Java, October, 1909 (Bryant and Palmer). The wing 
is shown in plate 45, fig. 36. The following additional notes are given: 
Male. — Length, 26 mm.; wing, 23.5 mm. 
Female. — Length, 33-38 mm.; wing, 24.5-25.4 mm. 
The erect hairs on the thorax are very conspicuous and do not 
occur in the related forms. 
The male hypopygium may be described as follows: 9th tergite 
long, deeply split by a long narrow notch for about half of its apparent 
length, the lobes squarely truncated at their tips and densely pro- 
vided with long prostrate yellow hairs, the margin of the segment 
with abundant short silky hairs of a yellow color (see pi. 47, fig. 53). 
9th sternite and pleurite apparently fused, at least the sternite 
not distinct, bearmg a bifid appendage at its ventro-caudal angle 
(see pi. 47, fig. 54) ; the outer arm of this appendage is shaped like a 
boomerang, the inner arm shaped as in the figure, extending caudad, 
entad, and dorsad, its pedicel slender, the tip expanded into a flattened 
lobe, whose margin is provided with groups of small black spicules. 
Viewed from beneath, this sterno-pleurite is deeply split medially by 
a V-shaped notch. 
**-*« CTENACROSCELIS UMBRINUS Wiedemann. 
Tipula umbrina Wiedemann, Aussereur. zweifl. Insekt., vol. 1, 1828, p. 49. 
Tipula castanea Macquart, Dipteres Exotiquos, vol. 1, pt. 1, 1838, p. 54. 
Tipula congruens Walker, Proc. Linn. Soc. Lond., vol. 5, 1861, p. 231. 
Ctenacroscelis sumatranus Enderlein, Zool. Jahrb., vol. 32, pt. 1, 1912, p. 5. 
A male and a female, Tjibodas, Mount Gede, April 20, 1909; a 
male and a female. Mount Salak, May 15, 1909; a male, Depok, 
Java, February 10, 1909. (Brj^ant and Palmer.) 
1 Zool. Jahrb., vol. 32, pt. 1, 1012, pp. 28, 29, 
