818 R. I. POCOCK 



with tlie front half of the area lying before the sulcus and the 

 posterior half of the cylindrical portion piceous ; the rest of the 

 upper surface including the keels and the tail clear yellow; the 

 lateral surface and the legs ochraceo-fuscous ; sternal surface 

 entirely fulvous. 



Antennae longish, lightly incrassate, segments increasing in 

 length distally, the 6"* being distinctly longer than the 2"*'. 

 The dorsal surface finely coriaceous and flattish, the keels rising 

 high on the sides and horizontal. A well develop3d keel on the 

 1^* segment; keel of the 2"'^ large, this segment wider than the 

 P* and S'""^, its keel below that of the pt and o^"^ and much 

 larger than the latter. All the keels well developed, with very 

 thick margins, their lateral borders unarmed , posterior borders 

 oblique, posterior angles acute, those of the last 5 surpassing 

 the line of the posterior border. The sulcus extending from the 

 5*'' to the 19"', not sculptured. Lateral surface cor'mceous, the crest 

 above the legs forming a continuous shelf on the 4"^, beginning 

 to break upon the 5"' into an anterior larger and a posterior 

 smaller tubercle, the latter scarcely visi])le beyond the 8"' but 

 the former visible to the 16"'. 



Sterna marked with a strong transverse and a weaker longi- 

 tudinal sulcus. Anal slernite with the pair of tubercles projecting 

 as far as the median point, hence appearing to be tridentate. 



Legs finely hairy, with the femur more than twice as long as 

 the trochanter, one third longer than the tarsus, which similarly 

 exceeds the tibia , which is in turn as much longer than the 

 patella ; distance between legs of posterior pair greater than 

 the length of their coxae. 



Length about 46 ; width 6 mm. 



c/". Flatter and thinner than the 9, with more elevated and 

 relatively larger keels ; a pair of low processes upon the anterior 

 half of the sternum of the 5"' somite, and a tubercle on each 

 side at the base of the copulatory apparatus, which resembles 

 that of 0. karschii. Tarsi of legs from the 8"" somite padded 

 with hairs below. 



Length 41 ; widih 5.2 mm. 



