LARVAL FORMS OF COLEOPTERA 



52. Xintli abdominal seg'inent dorsally with a continuous row of 



small dark tubercles on the urog'omphi and on the space be- 

 tween them. (Each urogomphus with or without a toothlike 



spine on innerside) Pythidae (pi. 54 I-O) 



Ninth abdominal segment without a continuous row of tu- 

 bercles; only with two small tubercles proximally on dorsal 

 side of each urogomphus. (Each urogomphus with a large, 

 toothlike spine media nly on innerside) 



Othniidae { = Elacatidde) (pi. 

 47 J-K) 



53. Antenna contiguous to mouth frame. (Prothoracic legs fre- 



quently larger and thicker than those of meso-and meta- 



thorax, prothoracic coxae usually contiguous) 54 



Antenna inserted some distance in from mouth frame. (Pro- 

 thoracic legs not larger and thicker than the other legs, and 

 coxae not contiguous) 56 



54. Back of mandible opposite the cutting edge with sharp margin ; 



opposite the mola, excavate and without a spinose-setose 

 elevation. (Hypopharyngeal sclerome tricuspidate with 

 median portion bifid and strongly projecting ; ninth ab- 

 dominal segment without urogomphi, except in OmopJdus 



protens Kir.sch, from Russia) 55 



Back of mandible not as described above. (Hypopharyngeal 

 sclerome variable in form ; ninth abdominal segment with 



or without urogomphi) Tenehrionidae (pis. 57 A-U and 



58 A-K) 



55. Ventro-lateral suture distinct 



Alleculidae-AUecidinae (pi. 56 

 A-L) 

 Ventro-lateral suture absent ... Alleculidae-Omopldinae (pi. 56 



M, N) 



56. Molar part of mandible with the grinding surface transversely 



multicarinate ; antenna short and two-jointed, second joint 

 dome shaped and almost completely membranous 



Ndionidae (pi. 59 A-M) 

 Molar part of mandible with the grinding surface either 

 smooth, or bearing obtuse tubercles; antenna elongate and 

 two- or three-jointed, second joint usually clavate, distal 

 joint minute and dome-shaped, or absent. (Presternum 

 large and triangular; with or without strong, straight, 



pointed urogom])hi) Lagriidae (including the hetero- 



tarsine genera Anaedus, Para- 

 fenefvs and Ly props) (pi. 60 

 A-P) 



1931, pp. 103-113; 2 plates) as the type of a separate family 

 Boridae, thus substantiating the view of Thomson who in 1859 

 established this family on adult characters. 



42 



