58 



G. F. HILL. 



On the pleurae the armature is similar to that of the dorsum, except on the 7th segment, 

 which resembles the ventral surface. On the ventral surface the 1st, 2nd and 3rd 

 segments bear a single row of mixed short and long bristles increasing in length from 

 the 2nd ; the 5th and 6th segments resemble the corresponding segments of the 



Fig. 15. T. nigritavsis, adult larva, dorsal view. 



Fig. 16. T. nigritarsis, anterior end of adult larva. 



Fig. 17. T. iiigritai'sis, posterior end of adult larva. 



dorsum, the 7th is similar, but has some short bristles in the posterior row. The 

 integument of both surfaces bears transverse striae on the anterior two-thirds of each 

 segment, which are generally absent or replaced by punctures on the posterior 

 third. The armature of the terminal segment is variable. In most specimens there 



