4 6 



MORPHOLOGY AND TAXONOMY OF ADULT MALES 



Head subcorneal in dorsal view ; in lateral view obliquely dorsoventrally elongated, with the 

 anterodorsal bulge not pronounced ; length from apex to pronotal ridge 217-270 (average 242) 

 [i, width across genae 171-224 (average 195) \l. Median crest sclerotized and distinctly poly- 

 gonally reticulated ; with 5-8 (average 6-5) hair-like dorsal head setae, arranged in a group of 

 1-4 (average 2-8) on the anterior margin of the head and a group of 3-4 (average 3-8) more 

 posteriorly. Midcranial ridge dorsally represented by a short, weak ridge between the eyes ; 

 ventrally narrow but well defined, reaching ocular sclerite posteriorly, surrounding area with 

 weak polygonal reticulation posteriorly. Genae large, sclerotized, not distinctly reticulated, 

 without setae. Eyes : two pairs ; subequal ; corneae of dorsal eyes 20-30 (average 26) \l in 

 diameter and 3-1-4-6 (average 3-9) times as much apart ; those of the ventral eyes with cornea 

 21-30 (average 26) [i in diameter and 1-0-1-5 (average 1-2) times as much apart. Ocellus 

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

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

 tapering dorsally, well developed lateroventrally, but weak posteromedially ; below ocellus the 

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

 Dorsal ocular setae absent, ventral head setae consisting of 4-8 (average 5-3) h.s., situated anterior 

 to the ocular sclerite on each side of the midcranial ridge. Preoral ridge weak, sometimes 

 interrupted. Tendon-like apodeme long. Cranial apophysis short ; apex bifurcate, not 

 reaching level of posterior margin of ventral eyes. Mouth opening irregular. Anterior tentorial 

 pits apparently absent. 



Fig. 6. Physokermes piceae (Schr.), dorsal and ventral view. 



