( 562 ) 



simnliites a sixth spine. The gjenal process is broad and obtuse, and is separated 

 from the oral edge by a deep sinus, whicli is partly covered by the first and 

 second spines of the genal comb. The antenna is inserted near the vertex iu 

 both sexes. Its first segment is very large, being as long as tlie club and bearing 

 nnmerons short bristles. The second segment is very short, except on the anterior 

 side, where it is mnch produced distad. The first segment of the maxillary palpus 

 is longer than, or as long as, the second, and this is about as long as the fourth, or 

 longer, the third being the shortest. The labial palpus consists of five segments. 



The prouotum is long and bears two or three rows of bristles, besides a comb of 

 more than twenty-five spines. The thoracic and abdiuuinal tergites are denticulate 

 at the apical margins, particularly the proximal abdominal segments. The meta- 

 notnm has no comb of spines, while the following four or five abdominal segments 

 (usually with the exception of the first) bear a lateral comb of short, stout spines. 

 The basal abdominal sternite has always a number of small bristles on the sides, 

 the small bristles in front of the jiostmedian row of long ones of the other sternites 

 are numerous, and the median tergites have at least three rows of bristles. There 

 are three long antepygidial bristles in both sexes, and the eighth tergite has on 

 each side at least eight bristles above the stigma. 



The tibiae bear nnmerous bristles on the outer surface. The outer dorsal 

 bristles form a comb, as in Leptopsijlla, Hi/strickopsi/lla, etc., while four or five 

 inner dorsal bristles are prolonged. The first midtarsal segment is much longer 

 than the second. The fifth segment of the tarsi bears four pairs of lateral ventral 

 bristles (in higeiis five ])airs !), besides an additional pair on the ventral surface near 

 the base. 



The modified abdominal segments are very similar in all the species. In 



the S the eighth tergite is small and the sternite very large. Tbe ninth tergite is 

 laterally strongly chitinised, a trapeziform plate being formed which bears a row of 

 bristles at the apical margin and two exopodites at the lower distal angle. The 

 upper exopodite (F' iu our figures) is very long, and reminds one of a sail of a 

 ■windmill. It is provided with very thin bristles and bears a short, stout, blunt 

 spine at the lower distal corner on the inside. The second jirocess (F- in our 

 figures) is quite short. The horizontal arm of the ninth sternite (one on each side) 

 is more or less dilated at the apex and studded along the ventral margin with 

 moderately thick bristles, of which the distal ones are always short and sharply 

 pointed. The anal segment is long, and there is, proximally to the anal sternite, 

 always a very distinct plate, of which the true homology is still obscure (this 



sclerite is found in many Sii)houaptera). In the ? the seventh sternite has a 



broad and very shallow apical sinus in all the species, varying but little. The 

 eighth sternite is narrow, long, blade-like, with the tip obtuse. The anal segment, 

 especially the sternite, is long, and bears nnmerous bristles. The stylet is slender, 

 conical. There is one receptaculum semiuis, of which the head is about as long as 

 the tail. 



Genotype : D. ellobius lioths. (1904, as Ctenop.v/lliis). 



IHnopsfjllus ingens is a specialised branch which stands apart from the other 

 species of the genus. But, as we may ex])ect intermediate forms to be discovered, 

 it is not advisable at present to place ingens in a separate genus. 



Binopsyllus is confined to Africa south of the Sahara, and contains only large 

 species. It is easily distinguisLied from PalaeopmjUa Wagn. (1902) and Lepto- 

 psylla Hoths. (1911) by the hairiness of the body, the long first segment of the 



