LARVAL FORMS OF COLEOPTERA 



articulations by a complete or partial elimination of the 



cardines 17 



Maxillae deeply retracted. (Cardines distinct, or fused with 

 stipites) 22 



17. Urogomphi present; terga without glandular openings ("fo- 



ramina" of Peyerimhotf ) 18 



Urogomphi absent; terga with paired glandular openings. 

 (Labrum and clypeus fused with frons into a nasale; tar- 

 sungulus with a long adhesive hair) 21 



18. Eighth abdominal segment distinctly longer than seventh. 



(Small ninth abdominal segment with comparatively large 

 urogomphi; often developed as a springing apparatus) 



Laemopliloeidae^'^ (pis. 31 G-K, 

 and 32 H. I, K, L, P, Q) 

 Eighth abdominal segment about as long as seventh or 

 shorter 19 



19. Larva parasitic and physogastric with slightly chitinized, white 



head and body. (Mandible without mola) 



Catogenidae'' (pi. 33 I, J, L, M, 



Larva not parasitic and not physogastric, head and body 

 normally chitinized. (Mandible with, or, in single species, 

 without mola) 20 



*^ All of the following families and subfamilies — ■ 



a. Cucujidae-Brontinae (including the genera Brontes, Dedro- 

 phagus, and Psamnioecus), 



b. Cucujidae-Cucujinae (including the genera Cucujiis, Pediacus, 

 and Platisus), 



c. Prostomidae (includijig the genera Prostomis and Dryocora) , 



d. Laemophloeidae (including the genera Prostominia, Narthecius, 

 LatJiro'pus, Laemophloeus, Dijsmerus, Hemipeplus, Inopephis, 

 and PhloeosficJtus), and 



e. Catogenidae (including the genera Scalidia and Catogenus) — 

 are usually considered as one family, the Cucujidae, together 

 with the genera Oryzaephilus, Silvanus, Cathartus, Nausibius, 

 Coccidotrophus, Eunausihius, and Telephanus. These latter 

 genera, according to the characters of the imagines, have lately 

 been recognized by J. W. Wilson as constituting a separate 

 family, the Silvanidae. (The Genitalia and Wing Venation of 

 the Cucujidae and Related Families, Ann. Ent. Soc. Amer., 

 June 1930, vol. 23, pp. 305-358). Doctor AVilson, however, 

 does not find that the genitalia, wing venation, and body char- 

 acters furnish a basis for a division of the Cucujidae (sensu 

 Wilson) into four separate families, Cucujidae, Prostomidae, 

 Laemophloeidae, and Catogenidae, as borne out by the charac- 

 ters of their larvae. 



35 



