78 My. F. W. Edwards on the Old-World 



Cuia before tip of discal cell ; thorax 

 dark reddish brown. (Borneo.) .... leucoteln (Walk.). 



106. Abdomen with a median blackisli-hrown 



longitudinal stripe. (Java; Bengal.) acrnstacta.V^'mA. 

 Abdomen without such stripe 107. 



107. Thorax and last two abdominal segments 



bhick, rest reddish, (Java.) ^javensis, Del. 



Thorax reddish brown 108. 



108. Feaioraandtibiseall yellowish. (Bengal.) *diana, Macq. 

 Femora and tibite with black tips. 



(Sumatra.) klossi, Edw. 



The Hypopygial Structure. 



The liypopygium of Eriocera, which is in general similar 

 to tliat of many Limnopbilinae, shows a number of interesting 

 features. For the most part the terms employed in the 

 descriptions are those used by me for the Culicidse (see 

 'Annals of Tropical Medicine and Parasitology/ xiv. J 920, 

 pp. 23-40). There are, however, important differences 

 between the two families, and in some respects it is difficult 

 to homologise the parts, so that a full description of the 

 general type of structure in Eriocera will be useful to make 

 clear the descriptions and figures. It is necessary to state 

 first that in Eriocera there is no torsion of the ninth and 

 tenth abdominal segments. 



The ninth tergite is well developed and usually of quite 

 simple structure, sometimes produced or emarginate in the 

 middle, but never with conspicuous developments. It is 

 impossible to detect any line of division between the ninth 

 tergite and ninth sternite — in fact, the tergite may perhaps 

 be regarded as forming a complete ring, and the sternite as 

 a])sent altogether. That this may be the true state of 

 aff^airs is shown by the traces of a suture in the mid-ventral 

 line which can sometimes be detected. This is the normal 

 condition in the Limnopbilinae, but it may be noted that in 

 one or two Limnophiline genera (e, g., Phyllolabis) a small 

 separate ninth sternal piece is present, which may or may 

 not represent the true ninth sternite in an obsolescent 

 condition. 



The side-pieces are well developed, tubular, usually simple, 

 but occasionally with basal lobes. There are two pairs of 

 claspers (outer and inner), which in many cases are incom- 

 pletely separated, indicating clearly that the inner pair has 

 arisen as a development from the base of the outer (or vice 

 versa). The outer clasper is strongly chitiuised, more or 

 less bare, with a sharp-pointed, often hooked tip, but without 

 terminal spine. The inner clasper is tieshy, hairy, and has 



