18 ERIC MJÖBERG, ON A NEW GENUS AND SPECIES OF MARSUPIALS. 
Parallel to these two characters goes still another one. In Dr. concinna and 
Dr. nana the squamosal part of zygomaticum is distincetly inflated and the bulle 
comparatively very large, somewhat swollen. In the two other species there is neither 
a zygomatic inflation, nor are the bulle but normally developed. 
As can be easily seen, the old genus Dromicia naturally divides itself in two 
different groups, one with Dr. concinna and Dr. nana being the more specialised ones, 
having reduced dentition and modified squamosal parts of zygomaticum and bulle, 
Fig. 6. Skeleton of Fudromicia macrura mn. sp. 
showing the proportions between tail and body. 
the other one with Dr. lepida and Dr. caudata being the more primitive ones with 
complete and stronger dentition, no zygomatic inflation and normally developed 
bulle. 
These separating characters undoubtedly are of generic importance and there- 
fore I regard it as quite justified to receive the both first mentioned species (with 
the type Dr. nana) in the old genus Dromicia, and the two more primitive ones in 
the above established new genus Hudromicia, with the type of which they both 
agree in the above mentioned characters. 
In the genus Dromicia the syndactyly is apparently more complete than in 
Hudromicia, at least in comparison to the type of it. I have not had opportunity 
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