380 



and hinder half of the body not visibly punctulate. 



a 8 . Transverse sulcus much weaker, obsolete on 

 the 3 rd segment which in the 9 is scarcely 

 emarginate above .... rubro-limbatus. 



b s . Transverse sulcus very strong, present on the 

 3 rd segment which in the Q is distinctly emar- 

 ginate javanicus 



With the exception of vittatus and proboscideus , the species of this 

 group here described, have the following features in common: 



Head smooth , with a superior transverse crenulate ridge and a frontal 

 sulcus which extends to a point on a level with the eyes. Eyes large 

 acutely angled internally and separated by a space which about equals 

 or slightly excels the long diameter of the eye. Antennœ long or short. 



First segment moderatly large or narrowed laterally, usually exten- 

 ding inferiorly as low as the 2 nd . 



The rest of the segments with the anterior half finely ridged trans- 

 versely; the posterior half generally smooth and polished above, longi- 

 tudinally striate below, striae not extending up to the pore. Pore 

 small , situated behind the sulcus. Sulcus deep or nearly obsolete dorsally, 

 sinuate on a level with the pore. Sterna smooth. Ventral grooves long. 



Anal ring usually produced above into a distinct tail and below 

 often fused with the triangular anal sternite, although the suture 

 between them may persist. 



Valves with thickened compressed margins. 



Legs smooth above, generally rather sparsely hairy below, with a single 

 spine above the terminal claw and two or three spinules beneath it. 



Secondary sexual characters : Q with 2 nd and 3 rd segments enlarged : 

 cf with first segment larger laterally than in the Q, with longer 

 antennae and legs , the latter with their 4 th and 5 th segments furnished 

 with soft pads on the distal half of the lower surface. 



This group which contains a large number of Indo-Malayan species 

 may be known by the generic title of Thyropygus with erythropleu- 

 rus sp. n. as the type. 



77. Thyropygus javanicus , (Brandt.) PI. XXII, fig. 16 — 16 c . 

 Syn. Spirostreptus javanicus , Brandt, Recueil de mém. etc. p. 92 

 (184 1) ; Gervais Ins. Apt. IV, pp. 167 - 168 (1847). 



