230 AEG US CAPITATUS. 



gles of the thorax (subangular , not emarginate) ; the con- 

 formation of the lateral margin of the second and following 

 abdominal segments (thickened and glossy, widened out 

 on the last segment where this margin is notched at the 

 apex). 



Before to proceed to the description of the var. minor, 

 I ought to say that the males which have a spine or tu- 

 bercle on each side of the head between the eye and the 

 produced point of the fore margin, are regarded by me 

 as the var. major, those without these spines or tubercles 

 but with the mentum and jugulum opaque as the var. med., 

 and that the form which I believe to be the var. minor 

 may be characterized by its small size , by the total or 

 nearly total absence of the tooth which proceeds from the 

 upper surface of the mandibles a little before the base, 

 by the shining (Dot opaque) and deeply punctured men- 

 tum and jugulum , and by the subcostate elytra. The three 

 different forms may at once be recognized by the follow- 

 ing key: 



I. Mentum and jugulum opaque , impunctate or provided 

 with shallow , margined punctures. 



a. Head with a spine or tubercle between the 

 eyes and the produced points of the fore mar- 

 gin var. major. 



b. Head without spines or tubercles. . var. med. 



II. Mentum and jugulum shining, provided with deeply 

 impressed punctures. ...... var. minor. 



Aegus capitatus Westw. cf , var. minor. 



I have taken the following description from four speci- 

 mens: one, the smallest, measuring with mandibles 21.5 

 mm. '), belonging to the Leyden Museum and originating 

 from Serdang (East-Sumatra) ; the three others , measuring 

 with mandibles 22.5, 23.5 and 24.5 mm., belonging to 



1) The largest male with which I am acquainted (likewise from Serdang) mea- 

 sures with mandibles 47 mm. 



Notes from the Leyden Museum, "Vol. XI. 



