128 LUCANID^. 



Variation of the male. In small males the head and pronotum 

 are closel}' })unc'tured, the liead dull, the ])ronotuni rather 

 shining. Tlie mandibles are short' and irregularly toothed 

 almost to the base, where they are rather broad. In larger 

 specimens the head and pronotum are entirely opaque, very 

 closely punctured at the sides, but finely and simrsely in the 

 middle. The mandibles are fairly long and straight, still 

 with irregular teeth from near the base to near the tip. The 

 largest specimens have head and pronotum very finely and 

 sparingly punctured except close to the lateral margins, and 

 the mandibles are about H times as long as the head, straight 

 with strongly curved tips, 'the teeth very irregular and feeble, 

 except the first close to the base and the last just before the 

 curved tip. 



(^. Le»^f/t (with mandibles), 16-27 mm. ; (without mandibles) 

 14-20 mm. : breadth, 5-8 mm. 



$. Length, 15-19 mm. ; breadth, 6-7 mm. 



Andaman Is. Malay Peninsula. Borneo. Sumatra. 

 Java. 



Type in the Hope Dept., Oxford University Museum. 



This is a common and widely distributed Malayan insect. 

 The single Bornean specimen, called tigrinus by Dr. Didier, 

 will very likely prove to be the same. 



58. Dorcus boreli. (Plate X, fig. 11.) 



Prosopoccel'us boreli Boil., Le Naturaliste, xxvi, 1904, p. 284. 



^. Black, or blackish-brown with the head and pronotum 

 black, the tarsi clothed beneath with fairly long yellow hairs. 

 Narrowly elongate, with slender legs. Entirely opaque above 

 and almost entirely beneath. The prosternal process is 

 vertical in front and rather bluntly pointed. The seventh 

 joint of the antenna is acutely produced and the three club- 

 joints are rather short. The anterior part of the head slopes 

 obliciuely but without a sharjj carina at its upper edge. The 

 front angles are rounded and the sides of the head are very 

 feebly swollen behind the eyes. The clypeal jirocess is small 

 and bluntly triangular. The mandibles are rather longer than 

 the head, gently and evenly curved externally, minutely bifurcate 

 at the end, with a fairly broad, blunt tooth at the base, a small 

 blunt one before the middle and a still smaller one between 

 the last and the tip. The pronotum is short and broad and 

 entirely coriaceous. The front angles are produced but not 

 very sharp, the sides evenly rounded from the front angles 

 to the acutely spined lateral angles and sinuate from there 

 to the obtuse but well-marked liind angles. The base is 

 straight and very narrow. The scutelhnn and elj/tra. are 

 coriaceous, the latter narrow but nmch broader at the shoulders 



