REVISION OF THE SARCOPSYLLIDAE 59 
Without stylet ; abdominal sternites completely divided in the mesial line, 
each consisting of two separate plates. 
The genus is purely American. Only four species are known, all from South 
America. One of them (H. psittact) occasionally infests the aviaries in Europe, being 
introduced by some South American birds. 
Key to the species : — ■ 
(a) Maxilla long, narrow, pointed, curved backwards — H.pulex. 
Maxilla widest beyond middle, curved forward — b. 
(b) Fifth tarsal segment with eight bristles on each side, besides the sub- 
apical hair ; epimerum of metathorax without process — H. psittaci. 
Fifth tarsal segment with six bristles or less on each side, meta- 
thoracical epimerum of $ with curved process behind stigma — c. 
(c) Fifth tarsal segment with three or four bristles on each side ; meta- 
thoracical epimerum with two bristles — H. coniger. 
Fifth tarsal segment with six bristles on each side ($; $ not known); 
metathoracical epimerum usually with three bristles — H. broscus. 
1. Hectopsylla coniger, spec. nov. 
(PI. I, Fig. 5, 9 ; PI. II, Fi s . 16; PI. IV, Fig. 30) 
This species, of which we have both sexes, can be easily recognized by the 
curved process of the metathoracical epimerum of the the sexual organs of the $, 
the fifth tarsal segment of both sexes, and by some characteristic details of other organs. 
Head. — The frons is strongly angulate in the the angle being obtuse but not 
rounded ; in the ? the angle is very strongly rounded off. The occiput bears in the 
$ a lateral apical lobe (PI. I, Fig. 5). The end segment of the maxillary palpus 
is longer than in H. psittaci, the proportional lengths of the segments being in the $ 
8, 4^, and 10, and in the $ 11,8, 5^-, and 10^. The bristles on the head are 
essentially the same as in //. psittad. 
Thorax. — The pronotum bears four bristles on each side. There is one long 
bristle on the mesonotum placed near the sternite, and some short hairs situated 
further dorsad. The metanotum does not bear any bristles in the %. The episternum 
of the metathorax is in both sexes produced into a triangular process. In the % the 
epimerum of the metathorax bears also a process situated behind the stigma. This 
process is curved downwards. There are two long bristles on the metathoracic 
epimerum in both sexes. 
Abdomen. — The $ has on each side two or three bristles on the first tergite, one 
or two on the second, one each on tergites 4 to 6, and one or two on the seventh 
tergite. In the $ the first, second, and seventh tergites bear each one hair near the 
base on each side, while the other tergites have no bristles. 
