LARVAL F0R:\IS OF COLEOPTKRA 



20. Apical joint of labial palpus normal ; liypostomal rods diverg- 



ing posteriorly. (Submental-giilar plate absent, indistinct, 



or distinct) Phalacridae (pis. 32 A-G, and 



33 N, P-T) 

 Apical .joint of Inhial ])ali)us minute; hypostomal rods parallel. 

 (Siibmental-iiiilar plate present and distinct) 



Sinicripidae'' (pi. 32 J. M-0) 



21. Body elongate elliptical ; all of tbe setae normal ; first to 



seventh abdominal segments dorsally with large glandular 

 openings (or "foramina") ; nasale transverse and subrec- 



tangular Covylophidae - Arth rolipinae 



( Arth rolips and rth o penis ) *'^ 

 (pi. 3-1 A-C) 

 Body broadly elliptical ; many of the setae fanlike, or flagellate, 

 or chibsliaped covered with spinulae; first and eighth ab- 

 dominal segments with "foramina"; nasale forming an eye- 

 shadelike structure which covers all of the mouthparts 



Corijlopli idae - Cor ]j I o p h ina e 

 ( CorylopJwdes, Sericoderus, 

 Saciiim, Molamha)**' (pi. 34 



22. Cardo either comparatively small, narrow, often spindle- 



shaped, and longitudinally directed, or large, about as long 

 or longer than stipes, triangular, and immovable, without 



posterior condyle. (Labial palpus one-jointed) 23 



Cardo either of moderate size, subtriangular, much shorter 

 than stipes, and obliquely directed, or large, elongate-trape- 

 zoidal, movable, and with a posterior condyle, or fused with 

 stipes to a large, movable structure with a posterior condyle. 

 (Labial palpus one-jointed or two-jointed) 27 



23. Cardo comparatively small, narrow and longitudinally di- 



rected 24 



Cardo large and triangular 25 



24. iMandible with lamellate, usually long, multiserrate projection 



from inner margin between apex and molar part; maxillary 

 mala with uncus on middle of inner margin ; adhesive tar- 

 sungular hair absent. (Spiracles biforous; urogomphi 



present) N it idulidae-N if id id inae (pi. 35 



A-H, J) 

 Mandible with large, lobe-shaped projection from inner mar- 

 gin between apex and molar part ; maxillary mala subcylin- 

 *** P. de Peyerindioff, Etudes sur les larves des coleopteres, II. 

 Coryh)phidae, Ann. Soc. Ent. France, vol. 90, 1921, pp. 99-106, pi. 

 3. — According to the imagines the family Corylophidae is usually 

 placed as an aberrant family in the Silphid association, but the 

 larvae indicate no relationship to this group. 



36 



