BYPOCTONTJS. 



Ill 



Genus HYPOCTONUS, Thorell. 



Hypictonus, Thorell, Ann. Mm. Genova, xxvi, p. 360, 1888; id. 

 Ann. Mm. Genova, xxvii, p. 542, 1889 ; Pocock, A. M. N. H. (6) 

 xiv, p. 120, 1894 ; Kraepelin, Abh. Ver. Hamb. xv, p. 43, 1897 ; 

 id. Tierr., Scorp. etc. p. 228, 1899. 



Resembling Labochirus in the 

 absence of crests between the 

 median and lateral eyes on the 

 carapace, but differing in the absence 

 of a spiuiform tooth on the inner 

 border of the maxillary processes 

 and in the male sexual characters. 

 Female with first abdominal sternum 

 not inflated ; chelae normal, short, 

 not incrassate, the trochanter armed 

 above on its inner side with 5 

 Fig. 35. A. Hypoatonus for- strong spiniform teeth, the tibial 

 mosus, anterior end of cara- apophvsis su btriangular and strongly 

 pace. B. Ditto, chela of rf. i i_ .1 j ^ T ^ -\ 



C. H. oafesii, trochanter and serrafce aloa g bofch ed g 63 ' Male wlth 



femur of chela of J. first abdominal sternum inflated, 



without median groove; chelae long or 



incrassate ; trochanter less strongly, often obsoletely toothed ; tibial 

 apophysis modified, variable in form, furnished with inferior 

 apical lobe, its edges not evenly serrate. 



Type, //. formosus, Butler. 



Distribution. Assam, Burma, Yunnan, Borneo. 



Synopsis of Indian Species. 

 Females. 



a. First abdominal sternum with its posterior 



borderwidely rounded, not mesially produced. H. binghami, p. 113. 



b. First abdominal sternum with its posterior 



border mesially produced. 

 a\ First abdominal sternum with a single 



median pit or a pair of small adjacent pits. H. formosus, p. 116. 

 b 1 . First abdominal sternum marked with a pair 



of large pits. 



a 2 . Pits on first abdominal sternum sub- 

 circular ; all the legs red H. woodmnsoni, 



b 2 . Pits on first abdominal sternum sub- [p. 113. 



crescentic ; at least the first pair of legs 

 dark. 

 a 3 . Legs of 2nd, 3rd, and 4th pairs entirely 



red //. saxatilis, p. 115. 



b 3 . Legs of 2nd, 3rd, and 4th pairs with 



femora and patellse deep brown H. ranyunensis, 



[p. 110. 



