( 629 ) 



have ventrally near the apex one bristle oa the outerside and a short hair on the 

 innerside. The mid- and liindtibiae bear three (seldom two) short hairs at the 

 ventral edge, and a row of seven longer ones on the outer surface close to the dorsal 

 bristles. The longer bristle of the fifth dorsal pair is as long as the tibia is broad. 

 The long dorsal apical bristle of the midtibia reaches to the apex of the first tarsal 

 segment, while the respective bristle of the hindtibia is only oue-third the length 

 of the first hindtarsal segment. The apical bristles of the tarsal segments are short, 

 the longest of the second hindtarsal segment reaching to the middle of the third. 

 The fifth tarsal segment bears four bristles on each side, besides a snbapical liair, 

 and in addition a ventral subbasal pair. 

 Measurements :— 



The first hindtarsal segment is as long as the hindtibia measured along the 

 ventral edge. 



Modified Segments. — The eighth sternite of the i is very large. It bears on 

 each side about nineteen bristles, of which one situated at the apex is the longest, 

 two more situated farther upwards being also generally long. The clasper (PI. XI. 

 fig. 49) is produced into a long slender process (p) bearing some bristles. The 

 finger (f) is slightly carved, and bears a number of hairs of various sizes at the 

 apex. The finger does not appear to be jointed with the clasper, but represents 

 apparently a second process. The ninth sternite is not divided ventrally ; it is 

 rather large, boot-shaped, and stands in connection with a peculiar unpaired organ 

 bearing three very stout spines (PI. XL fig. 49). 



Tlie eighth tergite has no bristles above the stigma. Ou the ventral portion 

 of the tergite there are a great number of bristles, as shown in the figure (PI. XII. 

 fig. 54). The eighth sternite has some hairs at the apex. 



The stylet is slightly conical, being four times as long as it is basally broad. 



Length : <?, 2-02 mm. ; ? , 2-9 mm. 



We have five examples of this insect, as follows : — • 



4 (J cJ and 1 ¥ from Victoria, Australia, from an Opossum. 



21. Ceratophyllus novaeguineae sjjcc. nov. (PI. XIII. fig. 06. G7). 



Head. — The forehead (PI. XIII. fig. 06) of this species is rather strongly 

 rounded for a ¥ . There are six small bristles between the upper end of the 

 auteunal groove and the maxillary palpus, and farther down another row of 

 three, of which the ventral one stands just behind the palpus and the upper one 

 halfway between the first row and the eye. Between the two rows there are 

 two more bristles, the upper one being long and the lower one short, besides a 

 number of small liairs situated near the antenual groove. From the eye forward 

 there is a nearly horizontal row of three bristles, the one at the eye being short 

 and the one at the oral edge of the head being long. The hind part of the head 

 bears two oblique rows of bristles and a long bristle above the antennal groove. 

 The ventral bristle of the snbapical row and the next bristle stand widely apart. 

 The second segment of the antenna bears a long apical bristle and some finer 

 hairs in addition. Segments 1, 2, and 4 of the maxillary paljjus are nearly of 



