454 



MEDICAL ENTOMOLOGY 



^. Middle tergites of abdomen with a row of eight or more bristles 



on the two sides together , - . ... r . * /-. pallidus. 

 Middle tergites of abdomen with a row of six or less bristles 



on the two sides together ....... somalicus. 



f. Rostrum reaching to the trochanter t cleopatrae. 

 Rostrum not reaching to the trochanter ..... pyramidis. 



g. Subapical bristle of the seventh abdominal tergite in 3 on a 



conical process which projects beyond the apex of the 

 segment ; seventh sternite of J with about fifteen bristles in 

 front of the postmedian row on the two sides together . SCOpu lifer. 

 Subapical bristle of $ on a process, hind femur in both sexes 



with three bristles on the outer side ..... tori 115. 



Subapical bristle of $ not on a process; seventh sternite 

 of $ with many less than fifteen bristles ; hind femur with 

 two bristles on the outer side ..... h 



h. Subapical bristle of seventh abdominal tergite at least as long 



as the second hind tarsal segment i 



This bristle considerably shorter than the second hind, tarsal 



segment ......... n 



i. Epimerum of metathorax with four bristles .... aequisetosus. 



Epimerum of metathorax with at least ten bristles . . k 

 k. Longest apical bristle of second hind tarsal segment hardly 



reaching the base of the fifth segment nesiotes. 



This bristle reaching to the middle of fifth segment or 

 beyond ......... 1 



1. First mid-tarsal segment hardly two-thirds the length of the 



second chersinus. 



First mid-tarsal segment three-fourths the length of the 

 second .......... m 



m. Both processes of the clasper slender nubicus. 



One of the two processes broad, its upper edge rounded . . chcopus. 

 n. On the epimerum of the metathorax at least one bristle situated 



above the stigma niloticus. 



All the bristles of the epimerum of the metathorax ventral 



to the stigma ......... eridos. 



o. Hind coxa pear-shaped, the comb situated near the apex. p 

 Hind coxa more or less sinuate behind near the apex . r 

 p. Rostrum shorter than the maxillary palpus .... creusae. 



Rostrum longer than the maxillary palpus . . . q 

 q. Apical margin of the seventh abdominal tergite strongly 



chitinized dorsally, projecting backwards . , . . dtvergens. 

 This portion of the segment hardly more chitinized than the 



rest of the segment, projecting very slightly backwards . isidis. 

 r. Rostrum reaching beyond the trochanter . . . . erilli. 



Rostrum at the most reaching to the apex of the fore coxa, s 

 s. Rostrum shorter than the fore coxa . . ,, : _ . , t 



Rostrum extending to the apex of the fore coxa . ' . , . . regis. 

 t. First hind tarsal segment with five apical bristles which extend 



to the apex of the second segment or beyond , - - -~ -, gerbilli. 



