1912.1 



105 



mercifully expose all the defects of the specimens. The two sides of 

 what must probably be called the uncus are separated by an unusually 

 long narrow bridge. 



EXPLANATION OF PLATE VI. 



Fig. 1. Notarthrinus boulti $ type, upper and undersides x li 



2. „ „ (? smaller specimen- - x + li 



3. » » ? li 



4. „ „ Appendages of Fig. 1 specimen x 45 



5. „ „ „ „ 2 „ 45 

 Figs. 1, 2, 3, photo by A. E. Tonge : 4 and 5, by F. N. Clark. 



A NEW SPECIES OF ARIXENIA (DEBMAPTERA). 



BY MALCOLM BURR, D.SC, F.L.S., &c. 



Dr. Jordan, in the Novitates Zoologicas, Vol. XVI, December, 

 1909, gave an account of an anomalous earwig apparently parasitic on 

 a flying-fox, for which he erected a new genus Arixenia, with a special 

 family, the Arixeniidse, with a single species, A. esau. 



I have recently received a considerable number of a similar 

 creature from Mr. Edward Jacobson, of the Hague, who found them 

 in a cavern in Java. 



This species differs in important particulars from A. esau, Jordan, 

 and it is necessary to describe it as new. 



Akixenia Jacobsoni, sp. n. 



Colour yellow brown : agrees in 

 extei-nal structiu-e generally with 

 A. esau, but differs in the strongly 

 transverse pronotum, the anterior 

 and posterior margins of which are 

 parallel : the mesonotum is truncate 

 posteriorly, and not convex as in 

 A. esau, and the metanotum more 

 concave. Forceps slender, tapering, 

 and remote, strongly bowed in the 

 J , nearly straight in the '^ . 



<? ? 



Length of body - 18.5 mm. 23.5 mm. 

 „ of forceps 3.5 mm. 4 mm. 



Java : Banjoumas Residency, 

 Gouwa Lawa cave near the sea- 

 shore at Babakan. (Numerous 

 specimens : Edw. Jacobson.) 



The Nomotype is in my col- 

 lection. 



