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MR. B. F. CUMMINGS OX LICE 



just beneath the posteriov lateral angle. (Jlavicles present, each 

 running as a narrow rod from halfway down the lateral mai-gin 

 inwards and downwards to project beyond the hind margin into 

 the metathorax as a broad band, which curves down and then 

 forwai'ds again to be inserted into the transverse acetabular bar 

 liehind the first pair of coxte. The nota of both segments are 

 divided by a median longitudinal colourless line. Abdomeii : 

 Regularly ovate. Tiie terminal tergite forms a deep semicircular 

 band around the genital opening. Yentrally, the genital plate 

 ■with its chastotaxy forms an easily recognisable mark (see text- 

 %• 16). 



Text-fifi^ure 17. 



Ihidcecnsflavws. Head of male. 



External forr)i. — Female. As in the male, except for the usual 

 sexual differences of tl.e abdomen. 



Chcp.totaxy. — For differentiating species, the chsetotaxy in this 

 genus probably will prove of little value, as it is almost identical 

 in the male and female both of this species and of /. plataleoi 

 (except for the usual sexual differences at the end of the abdomen). 

 For example, on the second segment of the antenna there is one 

 elongate bristle and a shorter one beside it ; the signatural plates 

 are bare dorsall}' ; on the ventral sui-face is a single bristle in the 

 middle of each plate. On the clypeal band at the base there is 

 one bristle darsally, one projecting laterally, and one on the 

 ventral surface. At the distal end of the band there are three 

 more bristles similarly arranged. In both sexes of both species, 

 a,lso, there is a bristle on the dorsal surface of the skull just 



