COLEOPTERA HETEROMEKA. 283 



latter insects. Mr. Stephens has adopted two apparent relationships 

 of this division, neither of which appears to me to have any real 

 existence: in the first place, he unites the Heteromera with the Pseu- 

 dotrimera by means of Hispa (which is a real Pseudotetramerous 

 insect) and Sarrotrium ; and, in the second place, he introduces the 

 Pentamerous Scydmjenidae into this section, and makes them the con- 

 necting link between the Notoxidae and the Pselaphidae, with neither 

 of which groups, as it appears to me, does it possess any real affinity. 

 That the affinity of Endomychus and Lycoperdina (notwithstanding 

 the coccinelliform larva of the former) is towards some of the Taxi- 

 cornes of Latreille, such as Diaperis and Boletophagus, is a question 

 which requires considerable investigation. 



According to M. L. Dufour, the male organs of generation have a 

 texture approaching those of the Scarabsei and Silphte, whilst the 

 internal anatomy of the Tenebrionidae, Blapsidae, &c., considerably 

 resembles that of the Pentamerous Carabidaj; whilst, as further 

 instances of the latter relationship, it may be noticed that, with Lin- 

 naeus, Cychrus rostratus wasa Tenebrio, Aristus bucephalus was with 

 Fabricius a Scaurus, and the Helopideous genus Adelium K., was 

 arranged by him with Calosoma. 



Latreille divided the present section into four groups or families 

 (as he termed them) arranged as follows : — 



1. Elytra hard; tarsal claws simple ; head not narrowed behind into a neck. 



1. Melasoma. — Apterous ; antennse moniliform ; maxillas with an internal 



tooth. Typical genera Pimelia, Blaps, Tenebrio. 



2. Taxicor/ies. — Winged ; antennae perfoliated ; maxilla; unarmed. Typical 



genera Diaperis and Cossyphus. 



3. Stenelytra. — Winged; antennjE simple ; maxilla? unarmed. Typical ge- 



nera Helops, Cistela, Melandrya, OLdemera, Mycterus. 



2. Trachelides. — Body soft ; t ,rsal claws often bifid ; head narrowed into a neck. 



Typical genera Lagria, Pyrochroa, Mordella, Anthicus, Iloria, and 

 Meloc. 



The more recent and elaborate researches of Guerin, Sober, and 

 Curtis in this section, have shown that the dentated internal lobe of 

 the maxillaj is not a character constant nor exclusive in the first 

 group. Thus, in Erodius and Scaurus, the tooth is wanting ; whilst, 

 in the Helopideous genus Acanthopus, the tooth is strong, and even 

 bifid; the genera Stenochia, Phaleria, and Ulonia, also possess this 

 tooth ; hence, as well as from other considerations, M. Solier has 

 recently proposed another distribution of the section in the Annales 



