70 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



short setae. Lacinia with a terminal uncus of two ventral toothlike 

 lobes, dorsally with a row of five long setae near the mesal edge and a 

 short seta posteriorly, Palpifer indistinct. 



Abdominal segments 1-6 each with three dorsal annulets; each 

 annulet with a transverse row of setae except the last annulet of seg- 

 ment 6. Segments 7 and 8 each with two dorsal annulets, each 

 annulet with a transverse row of setae. Dorsa of segments 9 and 10 

 each with a transverse row of setae. Each abdominal spiracle-bearing 

 area with two setae ventrally and one seta dorsally. 



Raster with teges of 55-71 hamate setae scattered irregularly on 

 the venter of 10th abdominal segment. Setae curved at their distal 

 ends. Lower anal lobe divided into two adjacent sublobes. 



Genus Ataenius Harold 



Larvae of this genus may be characterized as follows: Frons on 

 each side with two posterior frontal setae and a microsensilla, a long 

 seta at each anterior angle, a single long exterior frontal seta and a 

 microsensilla, and a short anterior frontal seta and a microsensdla. 

 Each antennal base with two long setae and one short seta extero- 

 laterally and a long seta dorsally. Second and third antennal seg- 

 ments subequal, first long. Tormae asymmetrical; dexiotorma pro- 

 duced cephalad and caudad into an armlike structure; laeotorma 

 shorter than dexiotorma and slightly produced cephalad and caudad 

 with ends blunt. Scissorial area of left mandible with 81+2, S3 and S4. 

 Galea ventrally with four or five short setae, dorsally with three stout 

 setae. Lacinia dorsally with a row of five long setae near the mesal 

 edge and a short seta posteriorly. Labial palp 2-segmented. Spiracu- 

 lar concavity facing ventrally. Lower anal lobe divided into two 

 distinct sublobes. 



Key to known larvae of Ataenius 



1. Seventh and eighth abdominal segments broad, ninth and tenth abdomina' 



segments narrow (fig. 81) 4 



Seventh to tenth abdominal segments similar in breadth (fig. 80) 2 



2. Raster with teges of 28-36 setae; blunt stridulatory teeth on stipes 8-11. . 3 

 Raster with teges of 41 setae; conical stridulatory teeth on stipes 15 (2 depres- 

 sions on each side on the frons) Ataenius sp. (strigatus group) 



3. Each mandible ventrally without setae; labium with one microsensilla for 



each two processes in the transverse row of closely appressed processes on 



glossa Ataenius sp. (strigatus group) 



Each mandible ventrally with two setae; labium with one microsensilla for 

 each process in the transverse row of closely appressed processes on glossa. 



saxatilis Cartwright 



4. Stridulatory teeth on stipes 19 or fewer 5 



Stridulatory teeth on stipes 20 or more 8 



