359 



these is very generally a process, bifid or not, upon the anterior half 

 of the sternum of the 5^ segment. 



Synopsis of the species. 



a. Keels very small, defined above merely by a groove and without 

 a spiniform posterior angle. (Groove between the two halves of the 

 segments beaded, anal sternite convex posteriorly) . . . subalbum. 



b. Keels large or small but shelf-like with acute spiniform hinder angle. 

 a 1 . Keels small (as in Strong ylosoma of authors). 



a 1 . Lateral margins of the keels denticulate, the dorsal surface 

 ornamented with an anterior and a posterior marginal row 

 of setiferous granules; groove mentioned above not sculptured 



pygmceum. 

 b 2 . Lateral margins of keels not noticeably denticulate ; without 

 an anterior row of setiferous granules; groove sculptured. 

 a 3 . A row of setae along the posterior border of the tergites ; 



antennae yellow vinosum. 



b 3 . Without a row of setae along the posterior border of the 



tergites: antennae black, 

 a*. Posterior border of anal sternite truncate, trilobed. 

 a 5 . Legs entirely flavous, sculpturing of groove weaker, 

 a". A wide dorsal flavous band , and yellow keels . . 



semi- car neum. 



b G . Body entirely rose or ruddy red .... carneum. 



ô 5 . Distal segments of legs fuscous, groove sculptured 



into sharply defined ridges separated by a distance 



equal to about half their length flavicoxis. 



bK Tubercles on anal sternite long, papilliform far surpas- 

 sing the edge ; sculpturing of groove and colouring of legs 

 as in flavicoxis. 



a 7 . Segments black, sternal areas deep red, apex of 



keels flavous subnigrum. 



b 7 . Sternal areas and at least the lower part of the 

 lateral surface flavous. 



a 8 . Keels flavous only at the tip, the three distal 

 segments of the legs fuscous . . . nigricorne. 

 b s . Keels entirely flavous, the two distal leg- 

 segments fuscous subflavum. 



