1925 ] 
Notes on Hippoboscidce 
267 
blance. Only three veins run from the articulation to the lower 
[posterior] margin of the wing. Furthermore, as in Ornithomyia, 
the system of wing veins is colored in dark in the portion of the 
wing toward the anterior border and the articulation, as if the 
hollow veins were filled there with dense matter; while over the 
remainder of the wing the veins are delicate and transparent. 
Meigen shows this quite well in his drawings of the genus Orni- 
thomyia (Syst. Beschr., VI, PL 64.) In this connection there 
exists in Lynchia a peculiarity which has arrested my attention : viz. 
that the discoidal vein [fourth longitudinal; Mi+J is always inter- 
rupted by a clear and transparent portion, placed a short distance 
from the forking of the common posterior [sub-stem vein] into 
the discoidal [fourth longitudinal; Mi + 2 ] and the true posterior 
[fifth longitudinal; M 8 +CuJ. At first sight one might believe 
that the vein is actually interrupted in this spot, but in focussing 
correctly one soon is convinced that the interruption is merely in 
the substance filling the vein and not in the vein itself. I had 
at first thought that this was an accidental abnormality, but it 
now appears to me to be a typical feature. The costal vein 
[first and second sections of costa] is very short, not extending 
over one third of the wing, where the subcostal [first longitudinal; 
RJ unites with it and then forms about one third more of the 
anterior margin, extending as far as the point where the radial 
[second longitudinal; R 2 + 3 ] unites with the subcostal. The 
mediastinal [auxiliary; Sc] almost touches the subcostal [first 
longitudinal; Ri] and consequently the space between both is 
very narrow. The transverso-basal [humeral cross-vein; h] is, 
however, not absent, but is placed in an outwardly oblique 
direction between the costal and the subcostal [first longitudinal; 
Ri], before the point where the subcostal gives origin to the 
mediastinal [auxiliary; Sc.] The first longitudinal [second 
longitudinal; R 2 -f- 8 ] bifurcates into the radial [second longitu- 
dinal; R 2 + 3 ] and the cubital [third longitudinal; R 4 + 5 ] very 
close to its origin. The radial [second longitudinal; R 2 + 3 ] runs 
toward the anterior border, where it continues some distance as 
if it were the continuation of the subcostal [third section of costa], 
and soon unites under an acute angle with the cubital [third 
longitudinal; R 4 + 5 ], that is to say in the same anterior border; 
