12 ARKIV FÖR ZOOLOGI. BAND 5. N:0 12. 



p. 329). I do not think it inappropriate to give a more 

 detailed description of the mouthparts. 



The antenns (Fig. 9, Pl. I.) are 11- jointed; the P^ joint 

 is as long as the 2^^ + S'^+^''' joints, 2 V2 as wide as the 3^^ 

 and 11/2 as wide as the 2^^; it is club-shaped and provided 

 with numerous hairs especially in the median V^^; the 2''^ joint 

 is half as long as the P* and pyriform; the following 3 joints 

 (3—5) are of equal size, the following two are shorter, but 

 with the 7^^ joint the joints begin to increase in width 

 towards the three last ones which are as wide as the 2"*i one. 

 The terminal joint is pointed and has externally near the 

 top a depressed area which bears a dense bunch of small 



hairs. 



All the joints bear numerous hairs which increase suc- 

 cessively in length towards the top. 



Textfig. 7. Clypeus and labrum of adult. X 155. 



The mouthparts. 



The labrum (Textfig. 7) is twice as wide as it is long, 

 soft and excaveted in the middle. The clypeus is deeply con- 

 cave anteriorly and has the lateral angles strongly projecting. 



The mandibles (Fig. 13, Pl. I) strongly chitinous, with 

 narrow pointed tips, curved at a nearly right angle with the 

 longitudinal axis. The median margin bears, a httle in front 

 of the middle and close behind the lacinia, two stout and 

 short conical molars on the same level, one above the other; 

 the lacinia or prostheca is a thin hyahn lamina, which is 

 as wide as V'3 of the width of the mandible at the base; its 

 edge is very finely serrated or fringed. On the ventral sur- 

 face of the mandibles there are several rounded pores and 

 at the anterolateral angle there are 4 — 5 hairs. 



The maxillse Fig. 11, Pl. I). 



The palpi are 4- jointed, but the demarcation hne bet- 

 ween the P* and 2°^ segment is partly obhterated, the P* joint 



