TYRINI 311 



in Hamotus s.s. but could just as easily be allocated to Hamotoides, we run 

 the gamut from a transversely oval median fovea with a vestigial sulcus present 

 for a short distance on each side, through an entire shallow depression not quite 

 reaching the lateral foveae, to an entire but interrupted sulcus. Furthermore, 

 the genotype, lateritius, is just such a midway species. It stands at about the 

 center of the genus with respect to sulcus development, and if the subgenera 

 were made separate entities then great confusion might arise. Finally, the clean 

 break between Arthmius, Syrbatus, and Syrmocerus in the pronotal outline 

 and associated foveae is a good example of how a genus may be fragmented 

 at the hands of taxonomists, whereas the breaking up of Hamotus would not 

 result in such a practical arrangement. 



Key to the Subgenera of Hamotus 



Pronotum with three perfectly free, circular antebasal foveae and with 

 no trace of a connecting sulcus, or rarely with the median fovea 

 transversely oval or with the foveae connected by an interrupted 

 vestigial sulcus, or a broad, shallow vestigial depression. (PI. XIX, 3) 

 HAMOTUS s.s. 



Pronotum with a deep, entire transverse antebasal sulcus connecting 

 the lateral foveae. (PI. XIX, 4) HAMOTOIDES 



Key to the Subgeneric Groups of Hamotus, s.s. 



Median pronotal fovea connected to the lateral foveae by an inter- 

 rupted sulcus, or the sulcus represented by a wide, very superficial 

 impression Group XI 



Median pronotal fovea lacking any connection with the lateral foveae 2 



2. Median pronotal fovea transversely oval, with a short vestige of a 



transverse sulcus entering the foveal lumen on each side. .Group X 

 Median pronotal fovea large, circular and entirely free 3 



3. Antennal segments IX and X much longer than wide Group I 



Antennal segments IX and X with width equal to length, or much 



wider than long, never longer than wide 4 



4. First visible tergite subequal in length to second, or the tergites very 



gradually shorter 5 



First visible tergite distinctly much longer than the second tergite .... 8 



5. Antennal segments IV-VIII quadrate Group II 



Antennal segments IV-VIII not all quadrate, some being transverse . . 6 



6. Antennal segments IV and V quadrate Group III 



Antennal segments IV-VIII all transverse 7 



7. General body pubescence varying from a clear light yellow, through 



golden to a reddish-yellow Group IV 



General body pubescence varying from a dark brown to nearly 

 black Group V 



8. Antennal segment XI with a large, shallow foveiform depression on 



ventral face near base Group VI 



