NATURAL SCIENCES OF PHILADELPHIA. 205 



zation, and should also remain subordinate to more essential characters. (In 

 the same manner the immense proboscis of L inin o b i or b y n c h u s does 

 not prevent it from having the closest affinity to some Rhamphidije, for 

 instance to my Rh. brevirostris with a comparatively short proboscis ) 



Not being able, on account of the scarcity of my materials, to attempt a final 

 partition of the group Limnobia in its present definition, I retain it in its 

 totality as a group of higher order and subdivide it in sections, some of which, 

 (as Rhipidia, Geranomyia, etc.,) are genera already previously estab- 

 lished, and which will also be retained in future, and others are only temporary 

 divisions, adopted for want of better ones. The 5th Section especially is not 

 sufficiently defined. 



Limnobia in its present definition almost corresponds to Limnobia 

 Macq. But, besides that it now includes Rhipidia and Geranomyia, it 

 has been freed from those species, which, like my Limnophila quadrata and 

 L. 1 e n t a have two radial area, and no petiolate areolet, and which Macquart, very 

 erroneously, separated from his genus Limnophila, where they belong, 

 and included in his L i m n o b i a, where they are strangers. (See more about 

 it in the preface and in L i m n o p h i 1 a.) 



Analytical Table. 



1. Proboscis prolonged inahaustellum, and both together longer than head and 



thorax. (Section 1st.) Gen. Geranomyia Halid. 



(There is a separate analytical table for this genus below.) 

 Proboscis shorter than the head, 2 



2. Antennae pectinated or moniliform. (Section 2d.) Gen. Rhipidia Meig. 

 (There is a separate analytical table for this genus below.) 



Antennas setaceous, 3 



3. A supplementary cross-vein between the anal and axillary veins ; wing3 



with brown, ocelliform spots; length 3J 4 lines. (Section 6th.) 



L. Argu3 Say. 

 No supplementary cross-vein, 4 



4. "Wings with brown or black spots, or with clouds along the central cross- 



veins or with brown dots on the anterior margin, 5 



Wings without spots, clouds, etc., only with a more or less distinct stigma, 12 



5. Feet black or dark brown, with a whitish ring before the tip of the femora, 6 

 Feet yellow or brownish yellow, with or without brown rin& s, 7 



6. Wings with blackish spots, especially along the anterior margin, and nu- 



merous small round dots in the areae : body blackish ; feet black, a tohitish 

 ring at a distance from the tip of the femora about equal to its own undth ; length 

 3J to 4 lines. (Section 4th.) L. defuncta nob. 



Wings with a dark stigma and clouds along the central cross-veins ; body 

 tawny and browu ; feet brown ; a white ring close to the tip of the femora ; 

 length 3 3J lin. (Section 3d. Dicranomyia Hal.) 



L. humidicola nob. 



7. The stigmatical cross-vein is at the tip of the subcostal vein, 8 

 The stigmatical cross-vein is separated from the tip of the subcostal vein by 



an interval equal at least to half the length of the stigma, 11 



8. Latter part of femora with brown rings at some distance from the tip ; wings 



spotted with brown, 9 



Femora yellow, brown at the tip only, and without pale rings ; wings with 



three brown ocelli and nebulosities on the cross-veins ; body yellow, with 



brown dots ; length 3 4 lin. (Section 5th.) L. triocellata nob. 



9. Intermediate stripe of the thorax pale, margined with brown ; length 4 5 



lin. L. solitaria nob. 



Intermediate stripe brown or black, capillary, 10 



10. Two pale rings on the femora; the lower branch of the fork formed by the 

 mediastinal cross-vein with the tip of the mediastinal vein is longer than 



1859.] 



