108 SILIS HAMATUS. 



This insect and the very nearly allied species described 

 by Mr. Waterhouse as Polemins hasalis will I have little 

 doubt come into the group 8ilini. Polemius is nearly al- 

 lied to Dixcodon proposed by myself (Biologia Centr. Amer. 

 Ill , 2. p. 78) ; they are insects which in the male sex 

 have the sides of the pronotum » nicked", as the American 

 author expressively terms it. I have not yet been able to 

 see a male of the insect here described , but I have no 

 doubt but that all the Eastern Silini, this species inclu- 

 ded, will require new genera for their reception. 



The present species has rather short antennae , 2nil joint 

 shorter than 3'^l; all the joints widened on each side so 

 as to be somewhat obconic , they are however a little ser- 

 rate internally. The thorax is very flat on the disk, its 

 sides have a small callosity caused by the crease which 

 crosses the reflexed margin (as in Discodon) ; there are two 

 small black linear spots on the front of the disk , and a 

 black spot on the reflexed margin behind the crease. The 

 Avidth of the thorax is nearly twice its length ; the small , 

 acute hind angles are a little deflexed and point forwards , 

 the base sinuous and with a marginal line. 



The elytra are firm , with two costae and a prolonged 

 humeral callus. 



The general aspect of this species is that of some spe- 

 cies of Lycidae. 



A single female specimen from the district of Rawas 

 (Sum. Exp.). 



25. Silis hamatus, sp. n. 



Nio'er , prothorace et scutello rufis , antennis serratis. — 

 Long. 6 — 8 millim. (ƒ 9. 



Mas, oculis majoribus, prothoracis lateribus juxta angu- 

 lum posticum sinuatis , abdominis segmento ventrali api- 

 cal! diviso , extus hamato. 



This is rather a puzzling species, because the thorax 

 only exhibits the characters of Silis in a very small degree , 



Notes from llie Ijeyden Museum , Vol. IV. 



