206 



207. Ornithoctoims andersoni, Pocock, Jour. Linn. Soc., Zool. xxiv, 

 p. 317, pi. xxii, figs. 1-3, 1892. 



5 . Colour : a nearly uniform reddish brown, darker beneath 

 and on femora, some white bairs at the extremities of the leg- 

 segments. Carapace as long as the patella and tibia and one- 

 fourth of tbe protarsus of the 1st or 4tb legs, considerably 

 exceeding protarsus and tarsus of 4th. Legs somewhat thickly 

 hairy, 1st and 4th subequal and considerably less than two and a 

 half times the length of the carapace; patella and tibia of 4th leg 

 a little less than of 1st. 



Measurements in mm. Total length 52, carapace 25, 1st leg 

 61, 2nd and 3rd 54, 4th 62, patella + tibia of 4th 12, of 1st 23. 



Loc. Tenasserim : Mergui (Anderson). 



Suborder ARACHNOMORPH^. 



Differing from the Mygalomorphse in having the basal segment of 

 the mandible articulated in a horizontal plane to the under side of 

 the head and directed downwards, the fang closing obliquely 

 inwards (tig. 52, p. 155). Tbe posterior respiratory organs are in 

 the form of trachea! tubes, which in most cases open by a common 

 aoerture just in front of the spinners. Spinning-mamillce normally 

 six in number, often accompanied by the cribellum or the colulus. 

 Coxa of palp furnished with a large maxillary process. Sternum 

 without distinct sigilla (at least in the Indian genera).' 



Distribution. Subarctic, temperate, and tropical countries. 



With the exception of one or two forms of doubtful systematic 

 position or great scarcity, the Indian species of Arachnomorphse 

 may be referred to the following families (those that are printed 

 in italics have been omitted from the present volume) : 



Synopsis of the principal Indian Families. 



a. Cribellum and calamistrum present. 



a 1 . Head-region large, rounded, high; posterior 



lateral eyes remote from the rest Eresidae. 



6 1 . Head low, narrowed, not strongly rounded ; pos- 

 terior lateral eyes very rarely remote from the 

 others. 



a 2 . Tarsi furnished with ungual tufts and an in- 

 ferior claw Psechridae. 



6 2 . Tarsi without ungual tufts. 



a 3 . Anal papilla long and conically acuminate . Uloboridce. 

 b 3 . Anal papilla short, semicircular Dictynidee. 



b. Cribellum and calamistrum absent. 



a 4 . Sternum much wider than long ; the posterior 



coxae widely separated Platoridae. 



b*. Sternum not wider than long; posterior coxae 



not widely separated. 

 o 5 . Posterior spinners absent or much shorter than 



the anterior Zodariidce, 



