186 AEGUS BIGIBBOSUS. 



curved; the outer basal angles are prolonged backwards 

 and embrace the lateral angles of the head; a little before 

 the middle of the length a broad triangular tooth with 

 rounded and inwardly curved top arises from the outer 

 margin; the upper side of the mandibles is opaque and 

 almost impunctate having only a few fine punctures near 

 the basal margin ; the rest of the mandibles is shining 

 and remotely covered with extremely fine punctures. 



The anterior half of the head is opaque, the posterior 

 half shining; it is sparingly covered with fine punctures 

 which are a trifle larger and transverse at some distance 

 from the anterior margin ; on the sides , however , the 

 punctures are large, deep and strongly confluent; the front 

 margin is concave and provided in the middle with two 

 rounded tubercles which are separated by a narrow but 

 deep notch ; the lateral angles of the head are rounded 

 off; the ocular canthus is narrow, its outer margin straight; 

 the sides behind the eyes are likewise straight and form 

 a small tubercle at the extreme base; the head is provided 

 on the middle of the upper side with two large shining 

 gibbosities. 



The prothorax is of the same width as the head and 

 proportionately longer than in Leeuweni; the disc is flat- 

 tened, slightly depressed along the middle and uniformly 

 densely covered with punctures which are larger in the 

 middle and near the margins ; along the front margin (its 

 middle excepted) the punctures are very large and partly 

 confluent; the sides are straight and parallel, the anterior 

 angles rounded, the basal angles not emarginate. The scu- 

 tellum has a few large punctures. 



The elytra are at the base slightly narrower than the 

 prothorax ; they are strongly and closely punctured along 

 the base and sides and at the apex ; each of them shows 

 six deeply impressed striae and traces of a seventh ; the 

 interstices between the first and fifth are provided with 

 three rather regular rows of very indistinct punctures ; on 

 the first (the sutural one) and the basal half of the sixth 



Notes from the Leydeii IVIuseuni, Vol- XIX. 



