18 DIPTERA OE NORTH AMERICA. [PART IV. 



Gen. II. GERAtfOMYIA. 



One submarginal cell ; four posterior cells ; a discal cell. Antennae 

 14-jointed, submoniliform ; joints not pedicelled. Rostrum and proboscis 

 prolonged, longer than the head and thorax taken together; the short 

 palpi are inserted about their middle. Feet slender ; tibiae without spurs 

 at the tip ; empodia indistinct or none ; ungues with teeth on the under 

 side. The forceps of the male is like that of Dicranomyia, and consists 

 of two fleshy, movable lobes, with horny appendages and a horny style 

 under them. 



This genus is most closely allied to Dicranomyia, and is dis- 

 tinguished from it only by the enormously developed oral parts. 

 These consist of a very long, subcylindrical epistoma, a still 

 longer lingua, which is slender and pointed, and a labium divided 

 in two branches at the tip, terminated by slender, flattened lobes ; 

 these branches are divergent and sometimes curled up in dry 

 specimens. The short palpi (bi-articulate according to Mr. 

 Curtis) are inserted about the middle of the proboscis to the 

 anterior angles of the rostrum. This proboscis is principally 

 used for sucking moisture and flowers. 



Mr. Haliday (Entomol. Magaz. I, p. 154) described this genus 

 in 1833, establishing it upon G. unicolor, a species found on the 

 rocks and shrubs near the sea-shore in England and Ireland. 



Mr. Curtis (Brit. JEntom. 513, 1835) gave a beautiful plate 

 and a description of this genus, which he very correctly dis- 

 tinguishes from Rhamphidia, by stating that the latter has 16- 

 and not 14-jointed antennae, and a rostrum of a different structure. 

 The structure of the proboscis of Geranomyia, subjected to a 

 careful dissection, is represented on the plate (the figure is repro- 

 duced in Walker's Ins. Brit. Dipt. Ill, Tab. XXVII, fig. 6, a, 6). 

 The second species, described by Mr. Curtis (G. maculipennis) 

 was considered by later authors as a variety of G. unicolor (comp. 

 Walker, 1. c. 310). 



G. unicolor has hitherto been found only in England ; a second 

 European species has been discovered in Austria and also called 

 G. maculipennis (Verh. Zool. Bot. Ges. in Wien, 1864). 



Macquart (Dipt Exot. I, p. 62, 1838) described the same genus 

 under the new generic name of Aporosa ; he introduces two 

 species, one from the Canary Islands, the other from Isle Bourbon. 

 But the American continent seems to be much more abundant in 

 Geranomyix. Mr. Loew (Linn. Entom. Vol. V, p. 394) pub- 



