niK M vi;i.\i'i)ii.\ IN riii; aistkaman mtskum — iii;("ii,F,MANN. 129 



l)lNK.\IATiiCRlCl"S (scnsK ^trirtii) FArrilM, sy/. nor. 



(Plate xvi., H^''. 4(5 ; Plate xvii., ti^'s. 1-7, 48). 



^ mat.: leiiiiftli 112 in in ; diaiiieter 9.50 in ni ; 54 se<r- 

 ineiits ; one seofinent apoilous ; 99 pair of legs. 



Dark blackisli-bvown, with an olivaceous shade, and a red- 

 brown belt along the inargius of the segments. Head blackisli- 

 brown, with brighter labi'um. Last segment and valves briglit 

 brown red. Legs dark brown, with the j)roximal joints paler. 



Head smooth, with two shallow indistinct im])iessioiis above 

 the labrum and with minnte transverse wrinkles oi" striae, of 

 Avhich a pair more strongly marked is seen crossing the post- 

 labral impressions. Fonr labral dimples. Median sulcus well 

 marked on the labrum and on the back of the liead, faiiit, 

 thread-like, or even obsolete between the antennfe. Eyes 

 sub-circular; the distance between them equal to twice the 

 diameter of one of them. Ocelli distinct, though rather 

 flattened, numbering about forty-one, arranged in six series 

 (7 + 8+84-7+6+5 to 8+8+8+7 + 6+4). -Antennal fossae 

 shallow; distance between the sockets equal to the length of 

 the four proximal joints. Antennae compressed as usual, 

 extremely shoi't, scarcely reaching beyond the middle of the 

 iii'st tergite ; the four proximal joints bare, except a few distal 

 setfe ; fifth joint poorly beset with setfe, these being 

 numerous on the last joint only. Foui" sensory cones. Mici'o- 

 nietrical measurements of joints ; 1st joint 0.832 m/m ; 2nd, 

 1.024 m/m ; 3rd, 0.928 m/m ; 4th, 6.832 m/m ; 5th, 0.832 

 m/m ; 6tli, 0.640 m/m ; 7th and 8th, 0.128 m/m ; total length, 

 5.216. Diameter of 2nd joint 0.800 m/m ; of 6th, 0.704 m/m. 



Scobinas from about the eighth to about the thirty-sixth 

 segment. - Distance between the dimples equal to about one- 

 and-a-half diameter of one of them. The dimple (PI. xvi., 

 tig. 46) is formed by a deep, circular sulcus enclosing an oval, 

 transverse, polished wart ; it is lying near the anterior margin 

 and is distinct from it ; behind the dimple is a very narrow 

 crescentic field, about half the length of the dimple, the surface 

 of which is dull but shows no distinct sti'iae. 



First tergite smooth, shortened laterally ; sides irregularly 

 rounded, the posterior mai'gin being more convex than the 



