LARVAL FORMS OF COLEOPTERA 



margin of labrum. (Stridulatin<>' organs present, terga of 

 ninth and tenth abdominal segments distinguishable ; labrum 



usually asymmetrical and not trilobed) 22 



EpipharA'nx with a curved single row of small spines behind 

 the median part of the anterior margin of labrum (pi. 87 Z) 

 (except in Valgus which, however, has no stridulating 

 organs). (Terga of ninth and tenth abdominal segments 

 usually fused completely; labrum symmetrical, often tri- 

 lobed) 24 



22. Lateral margin of labrum on buccal side with a series of trans- 



verse striae (pi. 88 D) Scarahaeidae-Rutelinae-Anonia- 



lini (pi. 88 B-D, F, G) 

 Lateral margin of labrum on buccal side without striae (pi. 

 87 U) 23 



23. Stridulating teeth of maxillary stipes pointed and curved (pi. 



87 V). (Distal joint of maxillary palpus usually without a 



setaceous sensorv area) Scarahaeidae-Rutelinae-Rutelini 



(pis. 87 U, V, 88 A) 

 Stridulating teeth of maxillary stipes truncate, as broad as 

 long, not curved (pi. 88 M). (Distal joint of maxillary 

 palpus often ending in a setaceous sensory area) 



Scarahaeidae-Dynasfinae (pi. 88 

 E, M, 0-R) 



24. Anterior margin of labrum not distinctly trilobed, almost 



straight or slightly emarginate in the middle (pi. 87 W, Y) ; 

 ninth and tenth abdominal terga separated ; tarsungulus long 



and pointed 25 



Anterior margin of labrum distinctly trilobed (pi. 87 Z) ; 

 ninth and tenth abdominal terga fused into a single dorsal 

 unit ; tarsungulus different 26 



25. Raster present, with numerous, minute, dark spinulae between 



the longer setae ; epipharynx with triangular callus and a 

 curved transverse series of small spines behind the anterior 

 margin of labrum (pi. 87 Y) 



8carabaeklae-T rich iinae ( Trich- 

 iotinus, Trichius, Trigonopel- 

 tastes, GnorimeUa) (pi. 87 Y) 

 Raster absent, end of abdomen with long, soft hairs ; epi- 

 pharynx without a triangular callus and Avithout a curved 

 series of spines behind the anterior margin of labrum. 

 (Labrum strictly symmetrical, slightly emarginate in the 



middle) Scarahaeidae-Valginac (Yalgns) 



(pi. 87 W, X) 



26. Tarsungulus cylindrical, distally obtuse (except in Euphoria) ; 



raster with median pair of distinct, longitudinal series of 



spines Scarahaeidae - Ceioniinae, part 



one {Giimneiiiti and Cetonini) 

 (pi. 87 Z) 

 54 



