140 



nally a row of less numerous, shorter bristles. Ijaterally there is a 

 more or less regular row of about 8 bristles, and between this row 

 and the apical row 3 or 4 more. 



Description of Plate IV. 



Fig. 1. Clasping organs, male. 



Fig. 2. Head of female. 



Fig. 3. Last tarsal joint of hind leg. 



Fig. 4. Terminal abdominal segments, female. 

 Fig. 5. Hind tibia. 



10 T Tenth Teigite. 



10 St Tenth Stemite. 



P Process. 



F Finger. 



M Manubrium. 



.IX St Ninth Stemite. 



8 T Eighth Tergite. 



8 St Eighth Stemite. 



10 T Tenth Tergite. 



10 St Tenth Stemite. 



Sp Spermatheca. 



CTENOPSYLLUS MUSCULI Duges. 



[Plate IV.] 

 Head. — Thefrons is prominent anteriorly, giving the head somewhat 

 the shape of a fez. There are 4 spines on the posterior border of the 

 gena. The antennal groove reaches to the top of the head. The max- 

 illar\^ palpi are shorter than the labial palpi, which reach to about two- 

 thirds of the fore coxa and are 5-jointed. Maxilla triangular. Eyes 

 absent. At the most prominent part of the frons anteriorly there 

 are two short thick spines, while below these, running along the 

 anterior margin, there are 5 bristles. Above there is an oblique row 

 of 4 bristles, with 1 more placed near the top of the antennal 

 groove. Between this oblique row and lower bristles there are nu- 

 merous fine hairs. On the occiput there is a subapical row of about 

 7 bristles on each side, while in front of this are 3 oblique rows of 

 bristles, the first containing 3, the second 4, and the third 5. On 

 the posterior margin of the antennal groove there are several small 

 hairs. On the first joint of the antenna there are about 3 hairs, while 

 on the second joint there are 4 or 5, the longest somewhat longer 

 than the third, joint. 



Thorax. — The pronotum has an anterior row of about 10 bristles, 

 and a ctenidium of about 24 spines. The mesonotum contains about 

 4 rows of bristles, more or less regularly disposed, each row consist- 

 ing of about 8 or 9 bristles. The metanotum has 2 rows of bristles, a 

 posterior row of about 10 bristles, and an anterior of the same num- 

 ber, while there are several smaller bristles in front of this. The 

 mesothorax contains about 10 bristles. The episternum of the 

 metathorax has 2 bristles, and on the sternum there is 1 large one. 



