180 



LUCANID^. 



and ratlier flat. The shoulders are acute. Tlie mpnfum and 

 submentum are smooth, or feebly })unctured, and opaque. The 

 metasternum is feebly punctured in the middle and closely 

 rugulose at the sides. 



Variation of the male In small specimens the head and 

 pronotum are closely ])unctured and more or less shining ; the 

 frontal tooth behind the base of the mandible is absent and the 

 latter has only a rudimentary tooth at the base above. The 

 pronotum has a rather well-marked median depression. In 

 larger males the puncturation is restricted to the sides of the 

 head and jironotinn and the mandibles have a short but well- 

 marked tooth at the base of each. At a further stage the head 

 and pronotum are very smooth, the former very dull, and the 

 mandibular tooth is situated farther from the base. In the 

 largest specimens the pronotum us well as the head is o])aque^ 

 the mandibular tooth is ])laced obliquely near the middle 

 and is fairly long ; the two ce])halic teeth are short but sliar]). 



(^. Length (with mandibles), 23-50 mm. ; (without man- 

 dibles) 20-35 mm. : breadth, 9-17 mm. 



$. Length, 22-26 mm. ; breadth, 9-5 to 10-5 mm. 



Assam. Malay Peninsula. Sumatra. Borneo. Java. 



Type in the Hope Dept., Oxford University Museum. 



This species ])robably occurs within (nir regi(m, although 

 the Indian records are imreliable. It was originally attributed 

 to Assam and a female s])e('imen described two years later was 

 called nialabaricus in the certainly erroneous belief that it came 

 from Malabar. The species will probably be found" in Tenas- 

 serim, but there is at present no actual warrant for including 

 it as an Indian insect. As it is liable to be confused with Mgus 

 labilis Westw. it seems desirable to include both forms here. 



07. ^gus labilis. (Plate XXII, figs. 15, 16, 20.) 



^Egus labilis Westw.,* Trans. Ent. Soc. Lond. 1864, p. 54, pi. xii, 

 fig. 5 ; Gnively, Records Ind. Mus. xi, 1915, p. 42G. 



Black, the elytra more or less shining, with the outer margins 

 opa{|U(> and sooty, the shape rather broad and depressed. The 

 front til)ia^ serrate at the outer edge, with about five larger 

 teeth ; the middle tibia> bearing two or three s])ines and the 

 hind tibia one or two. The legs sometimes in ])art of a dee)) red 

 colour. 



$. Ov-al in shape and less depressed than the male, with the 

 upper surface shining. The head is very coarsely and rugosely 

 punctured, with a transverse dei)ression on each side behind 

 the base of the antenna. The mandibles have each a large 

 right-angled tooth at the lower edge and in the closed position 

 a s])ace is enclosed behind the teeth. T^\\q pronotum is coarsely 

 and unevenly punctured, rugosely at the sides, and has an oval 



