EEIOPTEHINI. 437 



Rhypliolophus), sometimes not much before it or near its tip 

 (Gonomyia, Empeda, Gnophomyia, Symplecta). This difference 

 occurs in unquestionably closely allied genera. Tor instance, it 

 is quite a long distance before the tip of the auxiliary vein in 

 Paracladura, Brim., and Cladnroides, Brun., yet only a little 

 before the tip in. Cladura, Os. Sac. This very distinct differ- 

 ence of position of the subcostal cross-vein in undoubtedly allied 

 genera indicates that the importance of this character has been 

 overestimated by some authors. 



The 2nd longitudinal vein presents a peculiarity in one group 

 of genera, by the upper branch being almost upright, thus having 

 much the appearance of a cross-vein ; in fact, some of the older 

 authors regarded it as such. This is the principal character of 

 the Gonomyia group, which includes, besides Gonomyia, Empeda, 

 Monogoma, and two new genera constructed by me out of the latter, 

 Paramonyoma and Monyomioides. An intermediate genus, Gno- 

 phomyia, with the upper branch of the 2nd longitudinal vein not 

 upright, but more or less parallel with the lower one, may be 

 regarded as joining the Gonomyia group to the Erioptera group, 

 as some authors consider ; or as forming a link between the 

 Gonomyia group and the section LIMNOPHILIIST, my own opinion 

 inclining towards this latter view. 



Altogether this section is rather a mixed one, and although it 

 may be considered as intermediate between the LIMNOBIINI and 

 the LiMHOPHiMin, it may, speaking more narrowly, still be 

 regarded mainly as a collection of groups. 



These groups (referring to the Oriental genera only) may be 

 considered to be three in number. One, the Cladura group, is 

 characterised by the presence of five posterior cells, by which the 

 genera may be easily differentiated from all others. They are 

 Cladura, Paracladura and Claduroides, with a rather aberrant 

 genus Conosia, Wulp, which, however, undoubtedly belongs here 

 by virtue of its five posterior cells. The second group is formed 

 of the genera surrounding Erioptera, including Rhypholophus,~K.o\., 

 Molopliilus, Curt., and Mesocyphova, Os. Sac. The most con- 

 spicuous character of this group is the presence of stiff hairs 

 along at least the posterior portions of all the veins ; whilst one 

 genus (Ehyplioloplms) has the membrane of the wing also closely 

 pubescent. 



The remaining group centres round Gonomyia, and is promi- 

 nently distinguished by the upright or nearly upright position of 

 the anterior branch of the 2nd longitudinal vein, which appears 

 almost as a cross-vein, thus making the 1st submarginal cell only 

 about half as long as the 2nd. The genera comprised form a 

 tolerably compact group ; they are, Gonomyia, Empeda, Monogoma, 

 and my two new genera constructed from it, with the addition of 

 two rather aberrant genera, which, however, undoubtedly belong 

 here, namely, Lechria, Skuse, previously only known by one 

 species from Austi'alia, and the equally abnormal genus Styrinyo- 

 m-uia. Lw., which till 1887 was known from a fossil species only. 



2r2 



