104 



brown, both primary setae much longer and thicker than the secondary setae, 

 which number 7—8 on the episternum, 5—6 on the epimeron. Metapleuron 

 lighter, whitish, brownish with indistinct punctation near the suture; 

 episternum with small spinules near the anterior angle only; epimeron 

 without spinules; setae chestnut brown, primary setae less sharply differing 

 from the secondary setae than on the mesothorax, secondary setae almost 

 as long as the primary setae; episternum distally with 15—16 secondary 

 setae, epimeron including ventral process, with 29—31 setae. 



Prosternite indistinct, whitish, spinulose. Horn brown, light apically, 

 darker basally, with small spinules (Figure 168). 



Legs brown; punctation coarse; ratio of length of legs 82:100:102, 

 Fore coxa (Figure 169, A) less spinulose than in the preceding species; 

 middle of anterior surface with small spinules; both primary anterior setae 

 situated in basal part, short, thick, light brown, divided apically in finger- 

 shaped form of 5 — 6 large and 1—2 thin lobes; dorsal seta situated outside the 

 spinulose area; basodorsal seta moderately long; posterior apical dorsal 

 seta longer; both setae brown; anterior apical dorsal seta short; both 

 primary apical ventral setae moderately long, brownish, posterior seta 

 slightly larger; one secondary seta on the anterior surface, 2 small, thin 

 setae on the posterior surface. Anterior seta of trochanter short, thick, 

 divided apically, basal ventral seta light, spine- shaped. Primary ventral 

 setae of femur situated close together, as in all species of Baicalina, 

 in form of 2 light spines, the basal spine thick and blunt, the apical thin, 

 sharp, moderately long; posterior primary seta brown, long, situated in 

 the middle between the posterior margin and the basal spine. 



Number and arrangement of gills of B. spinosa 



Segment 



Dorsal 



Ventral 



2 



1 

 1 



1 



3 



1 

 1 



1 



4 



1 (0) 

 1(0) 



1 



Anterior seta of mid-trochanter (Figure 169, B) short, blunt, thick; 

 posterior seta moderately long, thin; anterior apical ventral seta in form 

 of light blunt spine; second anterior ventral seta, as in B.bellic osa, 

 in form of a larger, light spine situated much more basally, closer to 



the suture than to the spine; baso- 

 ventral seta long, posterior apical 

 seta slightly larger, subapical seta 

 the same, all 3 setae brown; posterior 

 surface with 2 thin light secondary 

 setae instead of a single seta as in 

 B.bellicosa and B.thamas- 

 t o i d e s. 



110 



FIGURE170. Baicalina spinosa Mart. 

 Larva in case, lateral 



126 



