81 



V. Description of Species. 



Ideohisi uni Balz. 

 1891. Balzan (12.) p. 531. 

 Céphalothorax elongate, often longer than broad. Antennae sliorter than the 

 céphalothorax and much narrower; their galea as a rule an nndwided stylet. 



Ideoronctts Balz. subg. 



1890. Balzan (46.) p. 443. (genus.) 



1891. Balzan (12.) p. 540. (.subgenus.) 

 Two eges; galea undivided. 



1. Ideoroncus Siamensis n. sp. 

 (PI. I, figs. 4a-i). 



One pair of eges: distance from front margin smaller than their diameter. 

 Céphalothorax is scarcelg longer than broad behind with median prolongation of 

 front margin blunt. Abdominal tergites are undivided. Inner margin of the imn}oi>able 

 finger of the antennae with a large anterior tooth and several small ones behind; 

 flagelhim consisting of four sparsely toothed hairs; lamina exterior wanting: galea 

 long nwderatelg curved. Femur of the palps is about four times longer than broad 

 and a trifle broader than the tibia, but much longer: the hand is almost twice as 

 broad as the tibia and shorter than the fingers. The four dorsal tactile hairs of the 

 hand of the palps are placed in a square. The co.vae are placed on a lower level 

 than the maxillae; the tibia of the first pair of legs is of almost equal length to the 

 seconil tarsal joint ; terminal lateral hair bifurcate. 



Ç. Céphalothorax. — The strongly arched eyes are removed from the 

 front margin a lesser distance than their diameter. The céphalothorax is scarcely 

 longer than broad with the lateral outlines moderately curved outwards in the 

 middle; the sides are suddenly bent inwards just behind the eyes, so that the 

 front margin becomes considerably shorter than the hindmost; the front margin is 

 set otf from the hinder portion and strongly chitinized. The median prolongation 

 is fairly distinct but blunt. The skin is smooth or very minutely reticulate; a few 

 short pointed hairs, of which the three pair along the front margin are the most 

 cons[)icuous, are found. 



Abdomen. — The abdomen is distinctly longer than broad, and broadest a 

 short distance behind the middle, so that it becomes almost obovate in shape. 

 The tergites are not longitudinally divided. All the tergal sclerites are of about 

 equal length with the exception of the second and third ones which are both 

 shorter and narrower; along the hindmost margin of each tergal sclerite or just 

 behind a row of fairly long pointed hairs are placed, consisting of a few hairs 

 on the first segments and several, about ten, on the last ones. The tenth and the 

 eleventh tergites bear two pair of real tactile hairs, placed in very wide cavities; 



I). K L) VideiisU Selsk Skr. ", K;i-Uki'. iKiliirviilciisk. iiü matliem .Mil IM 1 H 



