INSECTA. 545 
b. Distonce of posterior transverse vein from margin less than 
its own length. 
<r. Femora slender ; abdominal segments with bristles before 
the hind margin 36. Liancalus. 
6. Fore femora thickened towards base. 
' — Fore tibiae with long spines. . 36. Scellus. 
= Fore tibiae with very short spines. 
37. Hydrophorus. ^ 
Upper side of thorax with a somewhat concave depression behind. 
1. Arista apical or subapical. 
a. Third and fourth longitudinal veins strongly convergent. 
39. Medeterus. 
b. Third and fourth longitudinal veins parallel. 
40. Uhrysotimus. 
2. Arista dorsal. 
a. Abdomen in c? Avith 6 segments. . 41. Xanthochlorus. 
> b. Abdomen in cf with 6 segments. . 42. Saucropus. 
Tthagoneurus {Wiageneura^ Rond.). Loew (Mon. N. Am. Dol. p. 346) 
characterizes this genus as follows : — First joint of antennae with bristles on 
the upper side ; arista feathered or hairy ; first joint of hind tarsi with a 
bristle ; fourth longitudinal vein twice broken at right angles, with a con- 
siderable stump of a vein at each angle of the fracture; abdomen of cf a 
little compressed : hypopygium entirely disengaged. Most nearly allied to 
Doliclwpm. Sp. Hhagoncurtts (JDol.) ziczac (Wied.). 
Gerstiicker has published a list of the species of DoltchopodtdcB found in 
the vicinity of Berlin. Slett. ent. Zeit. 1864, pp. 20-48. The list includes 
104 species, many of wliich are described as new ; one of them forms the 
type of a new genus. 
Gerstacker, in describing several new species of this family from the Bava- 
rian Alps (Stett. ent. Zeit. 1864, pp. 145-164), also notices the previously 
described species met with by him in that district. 
New genera : — 
raracliiis, Loew, Mon. N. Amer. Dolich. p. 97 (see table). Known species 
ParacUus {Pelastoneurus) arcuatiis (Loew). 
Thrypticus. Gerstacker, Stett. ent. Zeit. 1864,. p. 43. Nearly allied to 
Chrysotus ; antennae very short, last joint rounded, arista very long ; legs stout, 
quite destitute of bristles ; no anal vein ; male with three copulatory appen- 
dages, the lower one boat-shaped, the other two foliaceous. Sp. T. marag- 
dinus, Gerst. 
Notes on known species : — 
The following known species of this family are figured by Loew (Mon. N. 
Amer. Dolich op.) : Hygrocehuthus latipes (Loew), pi. 3. fig. 1 ; DoUchopus 
funditor (I^oew), pi. 3. fig. 2 ; Gymnopternus lunifer (Loew), pi. 8. fig, 4 ; 
Pelastoneurus vagans (Loew), pi. 3. fig. 6 ; Tachytrechm voi'ax (Loew), pi. 3. 
fig. 6 ; Ortliochile soccata (Loew), pi. 3. fig. 8 ; Syhistroma nodicmn (Loew), 
pi. 4. fig. 10; Jlypophyllus dimipes (Ahr.), pi. 4. fig. 11 ; Haltericerus mceru$ 
1864. [voL. I.] 2 N 
