340 INSECTA, 
Puaryeeza, Meigq., 
Where the four first joints of the posterior tarsi are dilated. 
Those, in which the seta is inserted on the back of that joint, near 
its junction with the preceding one, whose tarsi are not dilated, and 
whose eyes are separated in both sexes, compose the genus 
Piruncuuus, Lat.—Cerruators, Phallen., 
Where the head is almost globular. 
The others have no seta on the last joint of the antenne. It is 
narrower and longer than in the preceding Insects. 
Scenopinvus, Lat., Meig—Musca, Lin., 
To which belongs the following species : 
S. fenestralis ; Musca fenestralis, L.; Schell,, Dipt. XII, 1. 
the female ; 2. the male. Head and thorax obscure bronze; ab- 
domen black, transversely striate, streaked with white in the 
male; legs fulvous; tarsi obscure. Very common on the glass 
in windows *. 
FAMILY III. 
TABANIDES. 
Our second family of the Diptera is characterized by a salient 
proboscis, usually terminated by two lips with projecting palpi, by 
the last joint of the antennz being annulated, and By a sucker com- 
posed of six pieces: it comprises the genus 
Tagpanus, Lin.t 
These Diptera are very similar to large Flies, and well known by 
the torment they occasion to cattle, by piercing their skin in order to 
suck their blood. ‘Their body is usually but slightly pilose. Their 
head is as wide as the thorax, almost hemispherical, and with the ex- 
ception of a small space, particularly in the males, occupied by two 
eyes, generally of a golden-green, with purple spots or streaks. Their 
antenne are about the length of the head, and are composed of three 
joints, the last of which is the longest, terminates in a point, has 
neither seta nor stilet at the end, is frequently lunate above its base, 
and with from three to seven transverse and superficial divisions. 
The proboscis of the greater number is almost membranous, perpen- 
dicular, of the length of the head or somewhat shorter, almost cylin- 
drical, and terminated by two elongated lips. The two palpi, usually 
* For all these subgenera, see the authors already quoted. 
+ This family is not connected with the preceding one. It appears to me to form 
a particular series with the following, leading the Nemocere to the Atericere. The 
preceding family would form another which would also lead to them, so that the 
last of this one would be approximated to the last of the Notacanthi. The Culicides 
and Tabanides are the only Diptera whose sucker is composed of six pieces. 
