238 
Psyche 
[September 
and a brownish spot on the knob. Abdominal pile long and 
yellow, under side of all tarsi with yellowish pubescence; 
joints 2, 3, and 4 of front tarsi are slightly more brownish 
in the type than in your specimen. Your specimen is slight- 
ly smaller than the type, but otherwise it is identical.” 
The female has the eyes bare; the third joint of the 
antennae is often more brownish than in the male; the 
front, about one-fifth the total width of the head, is black, 
shining, with three slight grooves ; lower parts of the orbits 
whitish pubescence. The 2nd, 3rd, and 4th joints of the 
front tarsi are often darker than in the male the latter 
being often decidedly yellow. The pile on the abdomen short 
and oppressed. Wings more yellowish at the base and the 
knobs of the halters entirely yellow. The species vary from 
9 to 10 mm. 
Becker restricted the genus Chilosia to those species 
having hairy eyes and antennal pits. Those with bare eyes 
and with the antennal pits confluent were placed in the 
genus Cartosyrphus Bigot. Shannon says: “Unfortunately 
the type species of Chilosia, flaviyes, has the eyes sometimes 
bare in the female, but the writer believes that this species 
will be found to have the anntennal pits separated which 
would put the genus Chilosia on a better basis.” 
If the narrow oblique impressed lines extending from the 
base of the antennae to the orbits, can be called antennal 
pits, then this species could be referred to Chilosia, other- 
wise it would be difficult to separate the female from species 
of Cartosyrphus which have similar oblique impressed lines. 
The genus Cartosyrphus seems to stand on very weak 
characters. 
