BY FREDERICK A. A. SKUSE. 85 



cross- vein, and the petiolated second basal cell. Baron Osteu-Sacken 

 (Studies I., p. 177) does not seem to attach more than specific im- 

 portance to the character of the second submarginal cell in Ptilo- 

 gyna, but that cell seems always to the same extent in contact with 

 the discal in all specimens of Ptilogyna ; whereas never in any of 

 the related insects have I found any approach to a dimunition in the 

 length of the first posterior cell. Consequently I am led to regard 

 this as one of the constant distinguishing characters between Ptilo- 

 gyna and Platyphasia. The male holding-forceps are of simple 

 structure, and seem similar to those of Ptilogyna, but they cannot 

 be satisfactorily studied in the dried specimen before me. 



The tibial spurs are longer than in Ptilogyna. 



398. Platyphasia princeps, sp.n. (PI. iv., tig. 7). 



(J. — Length of antennte 0-160 inch ... 4-06 millimetres. 



Expanse of wings 0-670 x 0-160 ... 17-01 x 4-06 



Size of body 0-730x0-090 ... 18-54x2-27 



Black. Head and rostrum with a somewhat hoary pubescence; 

 antennae with a somewhat hoary bloom ; first joint of scapus 

 mod(3rately long, second flattened, cyathiform or annular ; first to 

 seventh flagellar joints progressively, but very slightly, lengthen- 

 ing ; eighth J longer than seventh ; three terminal joints about 

 the length of first flagellar joint, but very slender ; the second to 

 eight joints with a single long branch at the base on the outer 

 side. Thorax : humeri and collare tinged with reddish-brown ; 

 lateral margins, and two short inverted cuneiform stripes hoary 

 with a pale pubescence ; pleurae with hoary patches and pale 

 pubescence ; lateral callosity of the metanotum pointed, reddish- 

 brown ; above oi'igin of wings and from centre of suture to 

 scutellum hoary ; scutellum and metanotum more or less reddish- 

 brown on the margins, hoary. Hal teres brown. Abdomen with 

 the first segment hoary grey, and lateral patches of same on the 

 second, third, and fourth segments ; fifth and sixth segment 

 almost entirely hoary grey, the seventh only slightly bordered 



