REPORT UPON ECTOPARASITES OF MAMMALS 1025 
remove any of the forms at hand from Trichodectes, although I am inclined to 
believe that some of them have more in common with Eurytrichodectes. 
Eleven species have been recorded from the family Procaviidae. Of these, I 
regard one as unrecognizable. Eight species are present in the material at hand 
of which three are described as new, making a total of fourteen species from this 
host family. Owing to the occurrence of so many species upon the same hosts, it 
is at times a very difficult matter properly to associate males and females with 
their rightful partners, especially if they are found at different times or come from 
different hosts or localities. In the material at hand, fortunately, the many 
specimens taken together permit critical comparisons and I feel reasonably sure 
of the associations that are here made. It appears that, although there is a 
marked sexual dimorphism, there are always certain characteristics which are 
constant in both sexes and which may be relied upon to correlate them. It is 
evident that previous authors have in at least two cases associated males and 
females of quite different species. 
These factors, combined with the inadequacy of descriptions which fail to 
note important and essential characters, even while dealing at length with non- 
essential details, and figures which are lacking in precision, have resulted in pro- 
ducing something of a tangle that even yet cannot be entirely cleared up. It is 
hoped, however, that the present essay will make some progress toward the 
elucidation of the problem. 
The species represented in the material at hand may be separated upon the 
basis of the following keys. Some other species are included on the basis of the 
literature. 
MALES 
1. Claws of the middle and posterior legs spinose-serrate on the inner face............... 2. 
Claws of these legs smooth on the immer face. <. o.< cea cece case cen sarees swssvceses 5. 
2. Anterior margin of the head without a distinct median notch....................... 
? Trichodectes diacanthus Ehrenberg. 
SSG #) a) LEN. 6) OO, 6 OS CBU OLe (COU. OTN OC “oO 0 We wl eB) 8) S) FS Ce Cele w 6: 16) 16 
Anterior margin of the head with a distinct median notch........................-. 3 
3. Preputial sac of the genitalia with several large teeth near its apex. T'richodectes lindfieldi Hill. 
Erepubia) sae withy DUG Ile Cet. 255 oy cee chee eee 5 cabs bab ea ve wwhele dete 4. 
4. Head with small, rounded processes on the posterior lobes. Trichodectes dendrohyracis n. sp. 
Head with the posterior margin straight................... Trichodectes oculatus Bedford. 
5. Head very broad and short, wider than long.......... Eurytrichodectes paradoxus Stobbe. 
Head with length and breadth at least subequal. .......0 0.5.0.0... .cuececcvwaveeecn 6. 
6. Anterior margin of the head without a distinct notch... ...... 06... ccc cece ew encee a 
Amitertor marc of the head! with: a distinct Motel, 20. ve ses eke es daw ok Onis wae wien 9. 
7. Male as yet unknown, but by analogy with the female probably with the posterior lobes 
of the head strongly produced and with the intersegmental membranes of the abdo- 
TCM MMe ta ss kay eee okie Rat meee eal Thies Valet Trichodectes granulatus n. sp. 
Posterior lobes of the head small and broadly rounded, intersegmental membranes of the 
POC tas Metrh COMUMM Es sere eala ke hi een ein g 1 OhPA Rav a'as0 468 oa0 We yaaa 8. 
8. Terminal complex of genitalia large and conspicuous.......... Trichodectes serraticus Hill. 
Terminal complex of genitalia (as indicated in published figure) very small........... 
MNGi aM AGM eo htt vial OY Or Pier a ea ae Eee RON See Trichodectes robertsi Bedford. 
9. Posterior lobes of the head conspicuously produced, slender and acute, preputial sac of 
genitalia with very large, flat teeth throughout its length....................... 
oe Sea ae LOE eee Ce ee ERENT ee ee Trichodectes univirgatus Neumann. 
Posterior lobes of head at most but slightly produced, preputial sac without such teeth. 10. 
