192 DIPTERA OF NORTH AMERICA. [PART IV. 



The Limnophilina are further distinguished by the position 

 of the great cross-vein, which is generally farther beyond the 

 inner end of the discal cell than is usually the case among the 

 Tip. brevipalpi In Trichocera this cross-vein is at the very 

 end of*the discal cell. Exceptions occur, however (compare the 

 genus Limnophila at the end). 



Several remarkable foreign forms of Limnophilina have been 

 described, but as I have not had the opportunity to study them 

 I will merely enumerate them here. (The descriptions of these 

 genera, with the necessary remarks and quotations, are repro- 

 duced or translated in the Appendix II.) 



Gynoplistia Westw. is a Limnophila with unipectinate an- 

 tennas in both sexes ; several species have been described from 

 Australia and South America. Mr. Westwood has even de- 

 scribed one, G. annulata, from North America. The description 

 is reproduced in the Appendix I. 



Ctedonia Philippi, from Chile, seems in no way distinct from 

 a South American Gynoplistia; Gloniophora Schiner, from 

 Australia, is established upon Gynoplistia subfasciata Walker, 

 a species which shows some structural peculiarities. 

 , Cerozodia Westw. from Australia, seems also to belong to the 

 Limnophilina; it has 32-jointed, pectinate antennas. 



Polymoria Philippi, with five species from Chile, may be one 

 of the numerous forms of Limnophila, although the statements 

 of the author are not complete enough to admit of any conclusion. 



Lachnocera Philippi, from Chile, is either a Limnophila with 

 four posterior cells, or perhaps a genus related to Goniomyia 

 (Eriopterina). The densely pubescent antennas of this genus 

 remind of the antennas of Limnophila lenta 0. S., which has also 

 four posterior cells and a venation not quite unlike Lachnocera. 



The Limnophilina contained in the Prussian amber are quite 

 numerous. Mr. Loew's pamphlet, Bernstein und Bernstein- 

 fauna, 1850, merely gives the names of the genera and species, 

 without descriptions, but owing to the author's kindness, I have 

 had a glimpse at the specimens, which convinced me of the close 

 analogy of some of them to North American forms. Cylindro- 

 toma longicomis Lw. is a Limnophila, closely allied to L. macro- 

 cera Say, by its long, pubescent antennas, its somewhat elongated 

 last joint of the palpi, and its venation. Cylindrot. brevicornis Lw. 

 is a Limnophila of the type of L. tenuipes Say ; Cylindr. succini 



