PROC. ENT. SOC. WASH., VOL. 22, XO. I, JAN., IQ2O 



Meloidae and Rhipiceridae. These mouth parts are character- 

 ized by the deep retraction, the large maxillary sclerite and the 

 greater portion of stipes being free, i. e., the inner margin is free 

 from both mentum and maxillary sclerite to near base. This 

 allows considerable lateral and forward movement of the max- 

 illae. However, the graduation through larval characters from 

 so-called Clavicorn forms to Heteromerous types is so gradual 

 that the recognition of the latter series cannot be substantiated 

 by the larvae. 



Many of the larger Heteromera have a strongly chitinized 

 hypopharynx. This is not developed in any of the Colydiidae 

 nor likewise in certain Heteromerous families, especially the 

 smaller species. From the Cucujidae and Cryptophagidae, the 

 Colydiidae can be distinguished by not having falciform lacinia, 

 from the Mycetophagidae by the distinct triangular presternum 

 and from other related families by the cereal structures. These 

 two curved cerci, with a sac-like depression between, occur in 

 certain Heteromera having the chitinous hypopharynx, but these 

 seldom have the bifore spiracle. 



Description of the Larvae and Pupae. 

 Aulonium tuberculatum Lee. 



Larva. -Form elongate, cylindrical, slightly wider along 5th and 6th seg- 

 ments; integument smooth, lightly chitinized, though somewhat heavier on 

 the last terga; sparsely haired. 



Head subcircular, slightly depressed, projecting; occipital foramen pos- 

 terior, epicranial halves ventrally separated by a semi-chitinous gular region ; 

 ventral mouth parts deeply retracted, hypostomal margins more heavily chiti- 

 nized and having a well-defined hypostomal bracon connected with hypophar- 

 ynx; the latter having a transverse narrow chitinization; clypeus and labrum 

 distinct, the latter transverse; front broadly fusiform, nearly bisecting epi- 

 cranial halves, sutures not complete anteriorly; antennae laterally inserted, 

 three-jointed; first joint transverse, second barrel-shaped, bearing a dis- 

 tinct supplementary joint, third elongate, slender; ocelli five behind base 

 of antennae, grouped in sets of three and two. Mandibles, grinding type, 

 having well developed molar part bearing fine asperities on the inner face, 

 apex bifid and cutting edge bearing two obtuse teeth; ventral mouth parts 

 but slightly chitinized, maxillary sclerite large cushioned; cardo transverse, 

 chitinized portion transversely triangular; lacinia broad truncate at aprx, 

 bearing short chitinous points on inner margin, maxillary palpi three-jointed 

 on a lobe-like palpifer; submentum hour-glass shaped; mentum b;im-l- 

 shaped; stipes transversely fused; labial palpi two-jointed; apical joint cy- 

 lindrical; ligula broad oval. 



