6 4 



MORPHOLOGY AND TAXONOMY OF ADULT MALES 



(average 23) y in diameter and 31-5-8 (average 4-6) times as much apart ; those of the ventral 

 eyes 20-27 (average 23) y. in diameter and 1 -2-1 -6 (average 1 -5) times as much apart. Ocellus 

 small. Ocular sclerite well sclerotized and polygonally reticulated throughout. Preocular ridge 

 with ventral part reaching or almost reaching midcranial ridge. Postocular ridge thin and 

 tapering dorsally, well developed lateroventrally, and narrow but well defined posteromedially ; 

 below ocellus the ridge splits up, with anterior branch partly surrounding ocellus. Interocular 

 ridge absent. Dorsal ocular setae : 1-4 (average 2-2) h.s. on each side ; ventral head setae : 

 3-5 (average 4-5) h.s., 2 of which are usually situated anterior to preocular ridge and 2-3 

 posterior to it. Preoral ridge present. Tendon-like apodeme long. Cranial apophysis short ; 

 apex bifurcate with a central lobe, not reaching level of posterior margin of ventral eyes. 

 Mouth opening irregular. Anterior tentorial pits absent. 



Antennae 10-segmented, filiform ; 1024-1144 (average 1070) y, long, i.e. longer than half body 

 length (ratio 1 : 1-51-1 69, average 1-63), longer than posterior leg (ratio 1 : 1-01-1-05, average 

 1-04) and longer than penial sheath (ratio 1 : 3-30-3-69, average 3-48). Scape 52-60 (average 

 58) y. long and 40-48 (average 46) y wide, with 3 h.s. Pedicel with weak polygonal, dorsal 

 reticulation ; 44-52 (average 46) y long and 40-48 (average 45) y wide ; with 8-14 (average 

 10) f.s., 4-8 (average 6-3) h.s. and a sensillum placodeum. Segment III bulging in the middle, 

 2-0-2-4 (average 2-2) times longer than wide (52-68, average 61 y long and 26-32, average 29 

 y. wide) ; with 2-4 (average 3-1) h.s. and 6-10 (average 8-3) f.s., the latter of medium length, 

 1-1-1-4 (average 1-3) times as long as width of segment ; with 2-4 usual sensilla basiconica. 

 Segments IV-IX cylindrical ; lengths of these segments (in y) 152-180 (average 166), 148-164 

 (average 155), 148-180 (average 166), 124-164 (average 147), 100-124 (average 111) and 72-94 



Fig. 16. Ctenochiton sp., dorsal and ventral view. 



