74 R. NEWSTEAD—THE PAPATACI FLIES (PHLEBOTOMUS) 
Mar.—Dark form. Not observed. 
This form is not uncommon; but is very much rarer than the dark form of 
P. perniciosus. It does not differ structurally from typical pale examples so that 
the following description of the palpi and antennae applies to both varieties. 
Palpi of five segments ; 1 very short, slightly dilated distally ; 2 a little longer 
than the succeeding one ; 3 decidedly broader than the rest; 4 a little shorter 
than 3; 5 as long as or slightly longer than 2; 1 to 3 hairy ; 4 and 5 scaly and 
with a few fine hairs. Antennae (fig. 2, p. 58) of 16 segments ; 1 and 2 the stoutest, 
the former with one side longer than the other, the latter bead-like ; 3 much the 
longest, being equal in length to the last five segments together ; 4-13 each very 
slightly shorter than the preceding one fespentin Gly ; 14 to 16, inclusive, more 
strongly incrassate (swollen) basally than the rest; all the segments with the 
exception of 1 and 2 densely clothed with hairs, the longest of which arise from 
the incrassated portion of each segment, except on the terminal segments which 
are furnished with hairs of equal length; 4 to 15, inclusive, also furnished 
with a pair of stout spines (fig. 2), which are suddenly elbowed or bent at right 
angles to their insertion so that for nine-tenths of their length they lie practically 
parallel with the surface of the segment to which they are attached. 
The external genitalia of the male are much larger than those of any of the 
other Maltese species; a character which may be readily recognised in life, 
under a low magnification. The morphological characters are shown in the 
accompanying illustration (fig. 18). 
Length, 2°5-2°65 mm. 
sc. 
ed. ye» 
\ ee LLL Lis Bes 
SS =| 
- LSNSSN 
SC. 
Fig. 18.—External genitalia of Phlebotomus papatasii, g ; sc, superior claspers ; ¢c, inferior 
claspers ; ed, ejaculatory duct ; p, penis. 
