48 rOBMICIDJE. 



56. Odontomachus rixosus, Smith, Jour. Linn. Soc. ii (1857), 



p. 64, $; Ford, Jour. Bomb. N. H. Soc. xiii (1900), p. 58, $ . 



. Similar to 0. hcematodes, Linn., but smaller ; more slender 

 and lighter in colour. Pale castaueous brown, the legs testaceous 

 yellow. Pilosity almost entirely wanting, confined to a few long 

 erect hairs on the front of the head and apex of the abdomen. 

 Pubescence very sparse, not giving the insect the silky gloss possessed 

 by 0. Jicematodes. Head contracted posteriorly, distinctly narrower 

 than in front; the striae entirely effaced on the posterior portions 

 of the head ; on the front, above the antennal carinae, they are 

 divergent posteriorly, spreading out fan-shaped ; denticulations on 

 the inner margins of the mandibles coarser and more distinct than 

 in 0. liannatodes. Thorax more feeblv, but similarly striate and 

 sculptured ; legs similar, the tibiae extremely attenuate at base. 

 Node of the pedicel more convex anteriorly, smooth, not striate : 

 the terminating spine above thick at base, its sides continuous 

 with the sides of the cone-shaped node ; abdomen proportionately 

 shorter, smooth and shining. 



Length, g 10-11-5 mm. 



Hab. Assam (Smythies) ; Burma (Fea, Binyham) ; extending to 

 Sumatra and Java. 



The variety from Burma is a little darker than the typical form 

 from Sumatra and Java, and has been separated as var. obscurior 

 by Dr. Forel. 



57. Odontomachus monticola, Emery, Ann. Soc. Ent. Fr. lx (1891), 



p. 560, ; Forel, Jour. Bomb. N. H. Soc. xiii (1900), p. 57, $ . 



. Dark castaneous or reddish brown ; the mandibles, antennas 

 and legs reddish yellow. Pilosity almost wanting, pubescence 

 very sparse and short. Head broader in front from eye to eye 

 than posteriorly, the side hollows deep and well marked; mandibles 

 robust, the apical teeth large, the inmost one broad as long, 

 broadly truncate : the inner margins of the mandibles with 7 

 or 8 small but distinct teeth ; the antennal hollows deep, the 

 front between and above them with rather coarser striae than 

 in 0. ri.vosus, Smith, divergent, spread out in fan-shape ; the 

 sides of the head shining, sparsely punctured, the upper half 

 smooth and shining, the striae almost effaced, the medial groove or 

 impressed line shallow, the emarginate occiput smooth. Thorax 

 with concentric striae on the pronotum, the mesonotum and 

 metanotum transversely striate ; legs with fine dense short 

 pubescence ; the femora and tibiae cylindrical. Node of the 

 pedicel smooth, slightly compressed, very convex in front, the 

 spine at the apex above thick at base; abdomen larger than in any 

 other Indian species, smooth and shining, rounded and strougly 

 convex above. 



Length, g 11-13 mm. 



Hab. Assam, the Garo hills (Long') ; Burma (Bingham) ; Ka- 



