7ft 



ISCHNURIDJK. 



A. 



B. 



C. 



Family ISCHNURID^. 



Legs furnished with a single 

 pedal spur. Sternum broad and 

 pentagonal. Genital operculum di- 

 vided in male, undivided in 

 female. Both movable and im- 

 movable fingers of mandible un- 

 toothed along the lower edge. No 

 spine beneath aculeus on vesicle 

 of tail. Extremity of torn squarely 

 truncate, forming almost a right 

 angle with the base of the claw- 

 lobe, and not produced into a 

 rounded lobe overlapping the claws 

 at the side. Carapace, abdomen,, 

 and chelw flat and depressed ; hand 

 with strong and complete finger- 

 keel; edges of finger of chela 

 granularly dentate, not produced 

 into sharp triangular teeth. Tail 

 thin, strongly compressed. 



Fig. 21. A..Chirtmiachetesfergusoni, Distribution. Ethiopian Region ; 

 tarsus of 4th leg, external view. Madagascar ; Oriental Eegion from 



B. Hormurus australasia, ditto. India to p apua; northern part of 



C. lomachua unwept, ditto. - T , i T> 



Neotropical Eegion. 



Synopsis of Indian Genera. 



a. A single median keel on the lower side of 



all the caudal segments, that on the 1st 

 sometimes obsolete ; tarsi armed beneath 

 and distally with many (5 pairs of) 

 spines HEMISCOKPIUS, p. 77. 



b. No median keel on the under side of caudal 



segments 1-4 ; tarsi furnished below with 



paired seta? or at most a few spines, 2 



distal and 1 proximal. 



a 1 . Median eyes well in front of the middle 



of the carapace ; tarsi spined beneath, 



protarsi spined at the distal end 



A 1 . Median eyes only just in front of the 



middle of the carapace; protarsi not 



distally spined; tarsi at most with 



one posterior distal spine. 



a 2 . Tarsi with median row of spicules ; 



posterior lateral eye above edge of 



carapace IOMACHUS, p. 81. 



fe 2 . Tarsi without median row of spicules ; 

 all three lateral eyes on edge of cara- 

 pace HORMURUS, p. 78. 



CHIROMACHETKS, p. 77. 



