176 C. B. Osten Sacken: 



The abdomen of the, male is not club-shaped, the forceps being 

 of a comparatively simple structure and not stouter than the re- 

 mainder of the abdomen. 



The ovipositor is slender and pointed, Tipula-like. 



The principal characters in the above definition are: 1) the ab- 

 sence of a distinct nasus; 2) antennae of $ with three, those of Q. 

 with two, rows of branches; the branches in the g.very conside- 

 rably longer than those of the 2 ; 3) the complete contact of the 

 submargißal and discal cells, and hence, the absence of the small 

 crossvein, 



The antennae, pectinate in both sexes, the absence of a nasus, 

 the structure of the male forceps, perhaps also the position of the 

 anterior branch of the second vein, which distinctly originates from 

 that vein, and does not look like a Prolongation of the first'), as it 

 usually does in Ctenophora, constitute so many differences from the 

 latter genus. 



Within this definition, there is but one Ptilogyna hitherto de- 

 scribed, and I have seen no other in any coUection ; it is the original 

 type of the genus, P. ramicornis Walk., from Australia. Macquart 

 received the same species, wrongly labelled North America, and 

 identified it with Ctenophora fidiginosa Say (Dipt, Exot. I, 1, 146, 

 tab. 3, f. 2). Loew, Linn. Ent. V, p. 391 showed that this Identifi- 

 cation was impossible and proposed to call the species P. Macquartii. 

 Finally Schiner, Novara p. 38, described the same species once more 

 as Ptilogyna picta. 



Several other species have been described as Ptilogynae, but 

 they- all have a distinct nasus; they either belong to other genera, 

 or their position is as yet doubtful, 



1. Ptilogyna par Walker, Ins. Saund. Dipt. p. 446, — Australia. 

 The type in the Brit. Mus. has the antennae of the male broken; 

 those of the female are subpectinate or serrate, like those of a female 

 Ctenophora. This, and the presence of long, distinct nasus prove 

 that this is not a true Ptilogyna. Venation of Tipula; submar- 

 ginal cell in punctiform contact with the discal. 



2. Ptilogyna flahellif er a Loew, Linn. Ent..V, p..392, Tab. 2, 

 f. 1—3. — Brasil. I have not found the type in Loew's collection 

 in Berlin. The description and the figures show a remarkable confor- 

 mity with the characters of Ptilogyna, except the presence of a 



') Of this character I judge merely from the figure in "Westwood, 

 Trans. Ent. Soc. 1881, Tab. 19, f. 14 c. Macquart D. E. I, 1, Tab. 3, 

 f. 2 gives it differently, more like a Ctenophora, 



