IIYPOCTOM s. 



Ill 



Genus HYPOCTONUS, Thorell. 



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



i; 1> 



lamb, xv, p. 43, L897 ; 



L> |) iriiMiii."., iniui'ii. +IIIU. .»/ u\: \rrnurn, .\.v 



Ann. Mus. Genova, sxvii, p. 542, L889; Pocock,~A. M. N. H. '(G) 

 xiv, p. 120, 1894 ; Kraepclin, Ahh. Ver. Ha 



id. Tien:, Scorp. etc. p. i'i'>, LSI) 1 .*. 



A. 



B. 



Resembling Labochirus 



m 



the 



absence of crests between the 

 median and lateral eyes on the 

 carapace, but differing in the absence 

 of a spiniform tooth on the inner 

 border of the maxillary processes 

 and in the male sexual characters. 

 /■'.male with first abdominal sternum 

 not inflated ; chela? normal, short, 

 not incrassate, the trochanter armed 

 above on its inner side with 5 

 strong spiniform teeth, the tibial 

 apophysis subtriangular and strongly 

 serrate along both edges. Male with 

 first abdominal sternum inflated, 

 without median groove; chehe 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, //. formosug, Butler. 

 Distribution. Assam, Burma, Yunnan, Borneo. 



Fie. 



6.\ 



A. Hypoctonus for- 

 moms, anterior end of cara- 

 pace. B. Ditto, -chela of J. 

 C. //. oatesii, trochanter and 

 femur of chela of J 1 . 



Synopsis of Indian Species. 

 Females. 



a. First abdominal sternum with its posterior 



border widely rounded, nol mesially produced. //. binghami, p. 1 



b. First abdominal sternum with its posterior 



border mesially produced. 

 <t\ First abdominal sternum with a single 



median pit or a pair of small adjacent pits. H. formosus, p. I 1 

 &'. First abdominal sternum marked with a pair 

 of large pits. 

 a~. Pits on first abdominal sternum sub- 

 circular; all the legs red II. woodniasoni, 



b'-. Pits on first abdominal sternum sub- p. 1 



crescentic : at least the firsl pair of legs 

 dark. 

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



red 11. saxatilis, p. 1 1 •' 



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



femora and patellae deep brown //. rangunenais, 



[p.l 



6. 



13. 



16 



