MYCETOPHTLIDAE. 13 



Rhamphidia, as shown above, is more related to the Limnobina than to 

 the Tipulina; by all means it ought not to be separated from Elephanto- 

 tnyia, as Mr. Loew does it. In my paper on the Limnobina of this country, 

 I have explained the close relationship of both. Elephantomyia is nothing 

 but a Rhamphidia with an enormously-prolonged rostrum, the development 

 of which has also modified the character of the palpi inserted at its tip. 

 (Geranomyia, with its long rostrum and stunted palpi, stands precisely in 

 the same relation to Dicranomyia.) 



Gynoplistia Westw. (an Australian genus) and Polymera Wied., both of 

 which I know only from plates and descriptions, belong, I presume, to the 

 Limnobina. 



Hesperinus, Walk, belongs to the JBibionidae (see my note in that family). 



About Pterocosmus Walk. I have no opinion whatever, not having seen 

 it, and not being able to establish any opinion on the description. 



To the list of genera already found in North America, I have to add 

 Dolichopt :a, Nephrotomy and probably Cylindrotoma, as I possess a species 

 apparently closely allied to the latter. Finally, it is the place here to 

 notice that Mr. Westwood (Lond. and Edinb. Philos. Magaz., 1835) has 

 described a Gynoplistia annulata from North America. As it is hardly 

 probable that an Australian genus should also be represented on this con- 

 tinent, it is to be presumed either that the genus is different, or that the 

 statement is based upon an error of locality. Gynoplistia has pectinated 

 antenna; in both male and female. 



Osten Sacken. 



Fam. TIL MYCETOPHILIDAE. 



Charact. — Ocelli three or two, in the latter case often hardly perceptible. 

 Thorax without a transverse suture ; wings without discal cell. 

 Coxa? much elongated ; all the tibiae with spurs. 



On the whole, the MycetopMlidce are so easily known that it would 

 be superfluous to give any more details about them. The genus 

 differing the most from the rest is Sciara, which shows some 

 affinity with the Cecidomyidcc. 



The genera hitherto introduced in this family are the following: 

 Cordyla Meig. (= Brachypalpus Macq.), Mycetopiiila Meig., 

 Azana Walk., Leja Meig., Boletina Staeg. (= Leptomorphus 

 Walk.), Sciophila Meig., Sciobia Loew, Tetragoneura Winn., 

 Gnoriste Meig., Asindultjm Lair. (= Macrorhynclia Winn.), 

 Ceroplatus Fair., Leptomorphus Curt., Diadocidta 7??;^. ( = 

 Macroneura Winn.), Aclada Loew, Mycetoma Meig., Plesias- 

 TINA Winn., DlTOMYIA Winn. (Symmerus Walk.), Platyura 

 Meig., Platyroptilon Westw., Macrocera Meig., Bolitophila 



