39 
M. Bezzi 
more or less yellowish at the base; legs as a rule entirely yellowish, at least in 
the male. 
2 (3). Frons more narrow, the parafrontalia of the male almost touching 
above, and the middle stripe of the female being not broader than one of 
the parafrontalia; sides of the face yellowish; legs entirely yellow even in the 
male . . P icz Macquart. 
3 (2). Frons broader, the parafrontalia of the male well separated to the 
vertex and the middle stripe of the female broader than one of the para¬ 
frontalia; sides of the face silvery; legs of the female with blackish femora. 
torquans Nielsen. 
4(1). Third antennal joint about three times as long as the second; 
abdomen entirely black and the silvery pollen forms a somewhat marmorate 
pattern; legs browmish, with basal portion of femora darker. 
spermophilae T. T. 
IV. CARNUS. 
The unique non-pupiparous Dipteron, which in the adult stage is parasitic 
on birds, is the strange Camus hemapterus ; the fly is haematophagous and is 
to be found chiefly on young birds, while the larva lives in the nests, but is 
saprophagous. 
The fly was described and figured by Nitzsch about a century ago, was 
redescribed and figured by Egger m 1854 under the same name, and owing to 
a misinterpretation of the original description w^as in 1862 renamed b\ 
Schiner as Cenchridobia eggeri. Thus for a long time it has been believed that 
there were two species, one belonging to the Pupipara, and one to the 
Acalvpterata of the family Borboridae (Schiner), or Sepsidae (Brauer). 
Collin in 1911, in a short but important paper, has cleared up the matter 
recognising but a single species and locating it in the family Milichiidae. 
In the subsequent year there appeared the paper of Prof, de Meijere, 
with the confirmation of the singular fact that the fly emerges from the 
puparium fully winged, and loses subsequently the wings, short stumps of 
which remain only as in the Pupiparous gen. Lipopteua. Thus in my papei 
of 1916 on the reduction of wings in the Diptera, I have included Camus, 
with Lipopteua, Echestypus and Ascodiptevon, in no. i of my graduation, 
p. 108. 
A supposed second species of the gen. ( avuus w r as described in 1913 bv 
Stobbe, but its distinction seems to be very doubtful. Engel in his recent 
paper has added some new records, and therefore this inteiesting flv is at 
present known to occur on birds of the genera Aquila , halco, Iicus, lynx, 
Sylvia, Stumus and Coloeus. I have received from Prof. B. Grassi a couple 
of specimens caught at Maccarese, near Rom, by Luigioni on a nestling of 
Falco ; these specimens are dark coloured and bristly as in setosus. 
