182 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



The Sumatran Prionota Jlaviceps Enderlein ^ is quite distinct from 

 nigriceps, wliich is a much larger species with a different body and 

 wing coloration. It may be that jlaviceps 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, Aiissereur. zweifl. 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 V/iedemann. 



Tipula monochroay\' iEDEMA-!<iN , Aussereur. zweifl. Insekt., vol. 1, 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, bearing 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, 

 en tad, 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 Exotiques, vol. 1, pt. 1, 1838, p. 54. 

 Tipula congruens Walker, Proc. Linn. Soc. Lond., vol. 5, 1861, p. 231. 

 Ctenaa-osceUs 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. (Bryant and Palmer.) 



» Zool. Jahrb., vol. 32, pt. 1, 1912, pp. 28, 29. 



