SYNOPSIS OF CEEAMBYCOTD LARV^. 151 



is a bare beginning of the work. The material studied has for the 

 most part been collected by the members of the Branch of Forest 

 Insect Investigations of the Bureau of Entomology, United States 

 Department of Agriculture. 



The 46 genera referred to above are as follows: In the family 

 Lamiidse: Ptycliodes, MonoTiammus, Leptostylus, Dorcaschema, Acavr- 

 thoderes, Liopus, Hyperplatys, Oncideres, Goes, Lepturges, Plectrura, 

 SynapTimta, Saperda, GrapMsurus, and Acanthocinus. In the family 

 Cerambycidae : CJiion, (Erne, Tylonotus, Phymatodes, Euderces, Opsi- 

 mus, Clytanthus, CyrtopJiorus, Hylotrupes, Smodicum, ElapTiidion, 

 Callidium, Romaleum, PJiysocnemum, Cyllene, Neoclytus, Xylo- 

 trechus, and Notorhina. In the family Lepturidse: Desmocerus, 

 Bellamira, Leptura, Rhagium, and UlocJisetes. In the family Prioni- 

 dse: Tragosoma, Prionus, Ergates, Orthosoma, and MaUodon. In the 

 family Asemidae: Asemum, Tetropium, and Atimia. 



The following table is based upon these genera and beyond the 

 family characters may not be found applicable to the entire super- 

 family. (See also Plate XXVII.) 



Superfamily CERAMBYCOIDEA. 



Head much longer than broad, deeply invaginated into the prothorax Division I. 



Head as broad as long, or broader than long, not deeply invaginated into the pro- 

 thorax Division II. 



DIVISION I. 



Labrum large; clypeus large, filling frontal margin Family Lamiidae. 



DIVISION II. 



Labrum small; clypeus small, not filling frontal margin Subdivision A. 



Labrum large; clypeus large, filling frontal margin Subdivision B. 



Subdivision A. 



Without spines or tubercles on anal and ninth abdominal segments. 



Family Cerambycidse. 

 Subdivision B. 



Head somewhat flattened; sides of head behind epistoma separated, angulate. Legs 

 quite long Family Lepturidae. 



Head not flattened; sides of head not separated immediately behind epistoma. Legs 

 moderate Section al . 



Section al. 



Sides of head behind epistoma fused for some distance, later separating, angulate. 

 Head invaginated into prothorax almost to base of maxillae. Usually larvae of very 

 large size Family Prionidae. 



Sides of head behind epistoma fused almost to apex, farther back each one rounded. 

 Head not invaginated into prothorax to base of maxillae. Larvae of medium size. 



Family Asemidae. 



