LARVAL FORMS OF COLEOPTERA 



ninth abdominal segment ventrally witli two to three points 

 on each side; maxillary mala with terminal incision) 



Oedemeridae - Calopodinae (pi. 



51 G-M) 



Ambnlatorial warts absent 46 



46. Ninth abdominal venter simple, without conical points 47 



Ninth abdominal venter with a conical point on each side 48 



47. Submentum and gnla fused and heavily chitinized. (Urogom- 



phi well-developed, but white and rather soft) 



CephaJoidae (pi. 52 J-L, N, 0) 

 Submentum and gula fleshy. (Urogomphi corniform, strongly 

 chitinized and curved upward) 



Zopheridae (Zopherus, Zoph er- 

 odes, Phello'psis and Phloe- 

 odes)'-' (pi. 52 F-I, M) 



48. Urogomphi simple, corniform, and curved upward; spiracles 



annular-biforous Synchroidae {SynchroaY° (pi. 



52 A-E) 

 Urogomphi with a branch at base ; spiracles annular 



Pedilidae {Eurygenins) (pi. 53 

 A-H) 



49. Venter of ninth abdominal segment with transverse row of 



asperities, or of small plates 50 



Venter of ninth abdominal segment not so armed. (Hypo- 

 pharynx fleshy ; each urogomphus broadly bifurcate ; spir- 

 acle biforous) Salpinqidae {Rhinosimus)^~^ (pi. 



54 A-H) 



50. Eighth abdominal segment at least twice as long as ninth, 



urogomphi excluded ; a pair of pits in margin between 



urogomphi : 51 



Eighth and ninth abdominal segments subequal, urogomphi 

 excluded ; a single pit present in margin between urogomphi. 

 (Asperities of ninth abdominal venter in a broken arch) 52 



51. Ninth abdominal venter bearing asperities arranged in a con- 



tinuous arch Pijrochroidae (pi. 53 I-K and 



L-O) 

 Ninth abdominal venter bearing small plates in place of 



asperities Boridae (Boros unicolor)^^ (pi. 



48 G-K and 55 A-I) 

 S2a The genera of the familj- Zopheridae are usually placed in 

 the tribes Zopherini and Nosodermini of the family Tenebrionidae. 

 o2b i^Tsnally considered as a separate subdivision of the family 

 Pythidae. 



^^ According to the characters of the imago the genus Boros has 

 been placed either in the Tenebrionidae or in the Pythidae by most 

 of the authors, but according to the characters of the larva it is 

 considered by R. A. St. George (Proc. Ent. Soc. Wash., vol. 33, 



41 



