REVISION OF THE SARCOPSYLLIDAE 
61 
Head. — The angle of the frons is strongly rounded. The bristles ot the head 
are longer than in coniger. The two genal processes are longer and narrower. The 
second segment of the maxillary palpus is much shorter than the fourth segment, the 
proportion being 7 : 1 1 in broscus, and 8 : 10 in coniger. 
Thorax. — The processes of pro- and metasternite are narrower. The meta- 
thoracic epimerum bears usually three long bristles, rarely four or two. 
Legs. — There is a lateral bristle on each side of the fore femur. The hind femur 
bears a series of eight or nine bristles. The tarsi are longer than in coniger, especially 
the fifth segment. This segment bears on each side six bristles, besides the long sub- 
apical pair, and has ventrally at the apex two short thin hairs (PI. IV, Fig. 29). 
Modified Segments. — The eighth tergite is broadly but shallowly emarginate 
apically, and bears a few more bristles than in coniger. Near the ventral edge of the 
segment there are three or four additional bristles standing separate from the vertical 
row of bristles. Proximally of these additional bristles (which are not present in 
coniger) there are several minute hairs. 
We have a series of twelve of this species from Pampa Central, Argentina, 
found on Conepatus kumboldti, by the late Dr. Carlos Berg. 
3. Hectopsylla psittaci 
(PI. I, Fig. 3, 6, 11 ; PI. II, Fig-. 17 ; PI. IV, Fig-. 32) 
Hectopsylla psittaci Frauenff.ld, Si/z. Bcr. K. Ak. Wiss. JJ'icri, Math. Nat. CI. XL. p. 462 (i860 
(off a Parrot, Chile). 
Baker, Proc. U.S. Nat Mas. XXVII. p. 375 (1904) ('Ceylon,' error ; psittaci =pulex, error). 
Pulex {Hectopsylla r) (estudo Weyenbergh, Periodico Zoologico III. p. 267 (1879) (Argentina, off Strix 
perlata). 
Rhynchopsylla pulex, Taschenberg, Die Fl'dhe p. 56 (1880) (partim ; pulex= psittaci, ex errore). 
Our best thanks are due to Prof. Dr. O. Taschenberg, of Halle, Dr. Hand- 
lirsch, of Vienna, Dr. Steck, of Bern, Dr. Dutoit, of Bern, and Prof. Dr. 
Doering, of Cordoba, for enabling us to compare typical specimens of psittaci, testudo, 
and pulex. The result of this comparison is different from what we expected it to 
be. While testudo is the same as psittaci, the Rhynchopsyllus pulex of Haller, is quite a 
different insect, though Taschenberg, I.e., had pronounced it to be identical with psittaci. 
However, the bad state of preservation of Frauenfeld's specimens goes far to excuse 
that error. 
As we have a good series of of both psittaci ( = testudo) and pulex, and possess 
also the $ of psittaci, which has not yet been described, we take the opportunity or 
supplementing and correcting in this paper the original descriptions. 
Head. — The frons of psittaci (PI. I, Fig. 3) is longer in the $ than in the $, 
being longer than the occiput measured above the eye. It is rotundate-angulate at 
one-third the way from the mouth to the antennal groove. There is one rather long 
