218 DOLICHOFID.'E. 



Golden-green. Front green. Hypostoma greenish -white, narrow 

 in the male, a little broader in the female. Thorax glaucous-green 

 beneath. Atitemi(B small, black. Wings grey ; veins yellowish, espe- 

 cially towards the base ; dlscal transverse vein in the Middle of the wing. 

 Halteres yellow. Legs yellow, without bristles ; jifth joint of tJie tarsi 

 black. Male. Abdomen yellow beneath. Fem. Abdomen yellow, with 

 a green spot or band at the base, and with a black dot on the second seg- 

 ment, last segment black. 



Rare. In Mr. Haliday's collection. (E. 1.) 



6. concinnus, Ztt. d. s. 489. 11 (1843). Aurco-viridis, antennis 

 flams, alis cinereis, venis pallidis transversa discali ante medium ala: 

 sita, halteribus pedibusque flavis ; Fwm,. abdomine flavo, ano viridi. 

 Long, f ; alar. If bn. 



Golden-green, smaller than the preceding species. Antenna less, 

 yellow tolth the third joint brotvnish. Wings gTey ; veins yellow ; dis- 

 cal transverse vein more withdrawn towards the base than in C. molli- 

 culus. Halteres yellow. Legs without bristles, yellow to the tips of 

 the tarsi. Male. Abdomen yellow beneath. Fem. Abdomen yellow, 

 with the last segment g^'een. 



Rare. In Mr. Walker's collection. (E.) 



Genus XIV. MEDETERUS. 



Medeterus, Fischer progr. (1819). Hydrophorus, Mq. Twchobates, 

 Hal. Orthobates, Wlbg. Hydrophorus p., Fin. ; Ztt. Medeterus 

 p., Mg. DoUchopus p., Fb. s. a. Musca p., L. ; Fb. 



Antenna; articulo tertio ovato, arista apicali. Oculi glabri, distantes. 



Proboscis protiiberans, crassa, obtusa. Abdomen depressiim, tomentosum, 



muticum. Hypopygium maris elongatum, inflexmn, appendiculatiim. 



Pedes mutici. 



Antenna short, the third joint ovate ; arista slender, apical. Eyes 

 glabrous, distant. Face broad in both sexes, divided by a transverse 

 line. Proboscis protuberant, thick, obtuse. Thorax with a large depres- 

 sion before the scutellum. Wings with the subapical vein obliquely 

 converging towards the cubital, the distance of the transverse discal 

 vein from the hind margin vaiying. Abdomen depressed, finely tomentose, 

 without longer hairs, the first segment as long as the second. Hypopy- 

 gium of the male inflected under the abdomen, and elongated nearly to 

 the base of it, with the appendages dcvelojjed, the outer ones not much 

 dilated. Legs long and slender, nearly unarmed, the middle tibia 

 having only two very minute spines between the base and middle, and 

 the hind pair sometimes a single one in the same place ; hind metatar- 

 sus much shorter than the following joint. In some small species, 

 which can scarcely be separated from this genus, the hind metatarsus 



