i66 . 0. H. Osten Sachen: 



panded here, the upper valves of the ovipositor, more straight and 

 pointed. 



Many of the species of this group have a white ring at the base 

 of each tibia (hence the name of the group); the wings are often 

 brown, with well-defined white or yellowish spots ; sometinies uniformly 

 brown, or yellowish with brown tips. The two pairs^ of branches on 

 joints 4 — 12 of the male antenna are slender and rather long, from one 

 and a half to two and a half the length of the joints; the longest 

 are in the middle of the flagellum, 



A list of the described Pselliophorae (sixteen in all) with remarks 

 and descriptions, will be given below. — 



3. Synopsis of all the described Ctenophorae. 



NB. This Synopsis has been conipiled from the published general 

 and local lists. Eeferences are given for the less-known species 

 only; the others will be found in Schiner's Fauna, in my N. Ame- 

 rican Catalogue etc.; the numbers in the square brackets refer to 

 the observations at the end. Ctenopliora melanura Walk, List, etc. 

 I, p. 78, from Nepaul is omitted, because, upon examination of the 

 types in the Brit. Mus., they proved to be specimens of a large 

 Sargus. As both specimens are without head and have the yellow 

 color and black tip of the abdomen peculiar to some of the eastern 

 Ctenophorae, Mr. Walker mistook them for that genus. A com- 

 munication of mine to Mr. v. d. Wulp on this subject was published 

 by him in Tijschr. etc. XXVIII, p. 81. 



Dictenidia Brülle (Syn. Ceroctena Rond.; Dicera Lioy). 



bimaculata Lin. Syn. paludosa Fab.; see Loew, Beschr. Eur. 

 Dipt. IL, p. 24. 



idriensis Scopoli, Entom. Carn. p. 316. [1.] 

 pectinata Gnielin (apud Schiner). 

 Europe, from England to the Volgo-Ural region (Eversm.); 

 Sweden, common; St. Petersburgh (0. Sack.); Moscow (Fedsch.); 

 N. France (Macq.) ; Holland (v. d. W.) ; Austria (Schin.) ; Galizia 

 (Nowicki); N. and S. Hungary (Kowarz); N. Italy (Bond.). 



Xiphiira Brülle. 



atrata M. Syn. iclmeumonea De Geer; Villaretiana Brülle 

 (apud auctores). 

 Var. ruficornis Meig. [S] ; nigrofasciata Brülle ; 

 jlavicornis Wied. Meig. [3.] 



