DEXIN. 211 
(l.c. p. 162). Phasiopteryx bilimeki, Br. & v. Berg., is conspecific with the insect I have 
described (anted, p. 166) under the name Neoptera rufa, and Masipoda geminata, Br. 
& v. Berg., with Exorista latimana (anted, p. 67). As my descriptions were published 
some months later than those of Brauer and v. Bergenstamm, the names given by these 
authors have priority. A typical female specimen of Pyrrhosia ochracea, Bigot (Ann. 
Soc. Ent. Fr. 1888, p. 268. no. 78), kindly sent to me by M. Bigot for examination, 
proves to be conspecific with Phasiopteryxr bilimeki, 2; Bigot’s very short description 
includes both sexes, but contains nothing about the abnormal shape of the wings and 
their neuration in the male sex. 
Group DEXIN A. 
The insects of this group are nearly allied to the “ Tachinine,” but usually differ 
from them by the feathered or plumose arista and by the more elongate legs. 
The 
frontal bristles, always in a single row on each side of the frontal band, do not descend 
beneath the root of the antenne; whilst in the “ Tachinine” 
close to the basal joints of the antenne or still lower (the genus Chetona only, in which 
the frontal bristles descend as far as the second antennal joint, forms an exception). 
The numerous Central-American genera, several of which are described as new, may 
be tabulated thus :— 
some of them are placed 
1. Proboscis longer than the head . . oe 2. 
Proboscis thick and retractile, shorter than the head 10. 
2. Proboscis slender and rigid, at least as long as the head and 
thorax together, with small or rudimentary terminal lips. 3. 
Proboscis a little longer than the head, with well developed 
terminal lips 4. 
. Scutellum and abdomen armed with spines . 
Scutellum and abdomen with the usual macrochete . 
. Abdomen broadly ovate, distinctly broader than the thorax, 
Hystrisiphona, Big. 213 
Prosena, St.-F. & Serv. ZIG 
spinose or densely covered with macrochetz 5. 
Abdomen elongate-oval or conical, usually not broader than ‘the 
thorax ; macrochetz always regularly arranged . 6. 
. Vibrissze inserted at some distance above the oral margin 
Vibrissz inserted just at the oral margin 
. Cheeks below the eyes at least half as long as the longitudinal 
Hystrichodezia, v. Réder. 2 / 5 
Bathydexia, v. d. Wulp. 2 2 2 
‘diameter of the eyes . . 7. 
Cheeks below the eyes very short, at most equalling a third of 7 
the longitudinal diameter of the eyes . 9. 
. Curvature of the fourth vein with an appendage 
Curvature of the fourth vein without appendage 
Scotiptera, Macq. 223 
8. | 
262 
