102 DIPTERA OF NORTH AMERICA. [PART IV. 



a prolonged rostrum. In other respects, the venation of Rham- 

 phidia and Elephantomyia is very like that of Limnobia ; but 

 the smooth ungues of both genera and the number of antennal 

 joints of Rhamphidia (the same number existing in Elephan- 

 tomyia, only atrophied) exclude them from among the Limnobina. 

 The most remarkable circumstance, connected with these 

 genera, is their geographical distribution. Rhamphidia alone is 

 common to Europe and America ; Toxorrhina occurs in North 

 and South America, and Elephantomyia has hitherto been found 

 in North America only. But the principal prevalence of Rham- 

 phidia and Elephantomyia seems to have taken place in the 

 period of the amber fauna. According to Mr. Loew {Bernstein 

 u. Bernsteinfauna, p. 3t) four species of Rhamphidia and three 

 of Elephantomyia (not distinguished by him from Toxorrhina, 

 compare below in these two genera) have been already discovered 

 in amber; a large number, considering the very fragmentary 

 character of our knowledge of the amber fauna, and the small 

 number of the species of these genera in the present age. 



Being in possession of a lump of copal, from Zanzibar, in 

 which a specimen of Styringomyia is included, I take occasion 

 to give a description of this genus, to complete the statements 

 of Mr. Loew in the Dipterologische Beitrage, I, p. 6. This 

 author discovered his specimen in the same substance ; another 

 species had been previously found by him in amber (Loew, Bernst. 

 und Bernsteinfauna, p. 31 and 38). The name of the genus is 

 apparently derived from jrvpai, a kind of tree-gum. 



Styringomyia Loew. — One submarginal cell, the peculiar, subtriangu- 

 lar shape of which depends on the abnormal course of the first and second 

 longitudinal veins, as the former coalesces with the costa before the middle 

 of the anterior margin ; the latter, originating from the first vein a little 

 before this point of coalescence, is suddenly incurved towards the costa a 

 little beyond the middle of the anterior margin ; the auxiliary vein is 

 not perceptible ; four posterior cells ; a discal cell. Feet comparatively 

 short, stout, hairy. Tibiae without spurs at the tip ; empodia distinct. 

 Antennse 16-jointed. 



The subjoined figure of the wing is copied from that of Mr. 

 Loew. My specimen is but very little different : the second vein 



