TIMOMENUS. — SYNTONUS. 199 



a little beyond the middle there is a second tooth, short and 

 small but very sharp ; in the $ almost straight, gently diverging, 

 denticulate along inner margin, then gently curved in at the 

 points. 



6 2 



Length of body. . . . 10-13 mm. 10'5-11'5 mm. 



„ forceps.. G-11 „ 6- 7 „ 



Burma : Karen-ni, Keba District, 3000-4300 ft. (Genoa Mus., 

 coll. Burr) ; AssAM : Nongpoh, in Khasi Hills {Ind. Mas., coll. 

 Burr). 



Type in the Genoa Museum. 



This handsome earwig is very closely related to T. nevilli. 

 Structurally it agrees almost exactly ; in both the whole body 

 is black with a brilliant lustre, but whereas this is green in 

 T. nevUU, it is blue-black in this species, and tliis very brilliant 

 blue-black lustre renders it unmistakable. In both species the 

 elytra are dull, and in both the forceps are very similar; but in 

 T. neviUi the latter organs are perfectly horizontal, while they 

 are undulate near the base in T. lugens; they are also more 

 strongly arcuate in the latter and the first tooth is larger, higher 

 and sharper. 



Genus SYNTONUS, n. g. 



Opisthocosmia, Burr (dim). 



Type, Opisthocosmia neoJohoplioroides, Burr. 



Small and slender. Antennae with 12-13 segments, slender 

 and cylindrical, the fourth segment relatively long. Head 

 smooth, tumid, sutures indistinct. Pronotum slightly narrower 

 than the head, nearly square, rectangular. Metasternum pro- 

 portionately narrower than in most allied genera ; posterior lobe 

 rounded. Elytra short and broad, no humeral angle. AVings 

 rudimentary. Legs not very long, slender; femora not thickened ; 

 tarsi short, the first segment only as long as the third. Abdomen 

 wWa first pliciform tubercle very weak ; the second ver}'' pro- 

 minent, decidedly convex, dilated about the middle and narrowed 

 apically ; less convex in the 5 . Last dorsal segment of S 

 narrow, longer than broad, decidedly narrowed posteriorly, and 

 distinctly sloping, forceps of S contiguous at base, then arcuate, 

 very slender ; those of $ cylindrical. 



Rancje. Ceylon. 



This genus is characterized by the short tarsi together with 

 the square pronotum, dilated convex abdomen, and strongly 

 angustate last dorsal segment. 



Superficially there is a resemblance to Obelura, but the free 

 and perfect though short elytra and the short tarsi distinguish it 

 at a glance. 



