by dr. h. schott. h9 



Tribus Orchesellini. 



DiCRANOCENTEUS Schott. 



Through Mr. Georg Waldau I have received new Collem- 

 bola-material from Camenin, and have there rediscovered the 

 form D. gracilis, described by nie thirty years ago and also 

 another interesting species. 



A comparative study of this as v^ell as other material from 

 Borneo, Smnatra and Meru enables me to give a complete 

 diagnosis of the genus as follows : — 



Mesonotum not protruding over the posterior margin of the 

 head. Abd. IV only slightly longer than III. Apical segment 

 sometimes rounded, sometimes extended. Antennae longer 

 than half the body with a basal ring and six joints, of which 

 the fifth is extremely long and annulated like the apical joints. 

 Eyes 8 + 8. Dentes with or without spines, mucrones 

 bidentate, with basal spine. Scales brown, varying in shape 

 but mostly rounded in the free end. Sculpture as in 

 Lepidocyrtus but much more distinct and with faint concentric 

 transversal lines at the base of the scales. On the anterior 

 margin of mesonotum there is a group of robust, serrated, 

 brown setae. Curved setae are to be found near the anterior 

 margin of the head and partly covering the base of the antennae. 

 Similar setae cover also Ant. I and II, where also very long 

 protruding, simple, vitreous setae can be seen. On the back- 

 side of the trochanter of the third pair of legs transparent 

 sensitive setae are found. 



8. DiCRANOCENTRUS SUNDANENSIS n. sp. 



Diagnosis. Claws with exceedingly small teeth, very easily 

 overlooked ; with one proximal double tootli and one simple 

 one ; pseudonychia small, empodial appendix lancet-shaped, its 

 ventral lamella with a hardly noticeable tooth, which is longer 

 on the third pair of legs. Tibio-tarsal sensitive setae com- 

 paratively short, ending pointed. Dental spines arranged in 

 three parallel rows, the spines of the external rows very big, 

 all slightly curved. 



Coloration. Ground colour light nearly white, but the 

 scales give the animal a shade of brown. The basal ring of 

 antennae dark. Ant. I and II dark brown with a bluish-black 

 distal ring. In Ant. Ill the bluish pigment is more diffuse. 

 Ant. V is greyish shining with a nearly black proximal spot. 



