82 GEO. II. HORN, M. D. 



Mandibles not prominent, arcuate at tip, not acutely margined above, head 

 strongly deflexed. Tarsi slender. 



Claws pectinate. Thorax acutely margined Odontonyx. 



Claws simple. Thorax not acutely margined. 

 Antennae slender, middle coxse not more widely separated than the an- 

 terior, thorax obtusely margined, prosternum moderately long before 



the coxse •. Anchy tarsus. 



Antennse serrate, (pectinate 'J,), moderately long, middle coxae twice as 

 widely separated as the anterior, margin of thorax very obtusely rounded, 



prosternum short in front of the coxse Ancliycteis. 



Antennse serrate, very little longer than head and thorax, middle coxse 

 and thorax as in Anchycteis, prosternum short, vertical in front of the 

 coxse Arteopus. 



Of the above genera Stenocolus alone has an onychium. The an- 

 terior coxae are moderately separated in the fir?t two alone, the tip 

 of the prosternum being also more prolonged. The first four genera 

 have the thorax acutely margined, in the others the margin is either 

 obtuse or very rounded. In Aiich^farsus and Anchycteis the last 

 joint of the maxillary palpi is triangular, in Arseopus moderately 

 elongate, flattened and truncate. 



Lichas Westw. is synonymous with Stenocobis, both appear to 

 have been published at nearly the same time, and as Lichas has 

 already been used in another department of Zoology, there is a 

 reason for retaining our own generic name apart from its very little 

 earlier date. 



STEl^OCOI-lJS Lee. 



Head moderately deflexed not retracted, frontal suture distinct, 

 clypeus partly membranous in front. Labrum transverse, rounded 

 in front. Mandibles prominent, suddenly arcuate at tip, upper side 

 acutely carinate. Mentum transverse, semicircular in front, ligula 

 moderately prominent, emarginate, lobes rounded, the terminal joint 

 of the palpi feebly triangular. Last joint of maxillary palpi elongate, 

 obliquely truncate at tip. Eyes moderately prominent, rounded, partly 

 concealed by the angles of the thorax. Antennae as long as half the 

 body, serrate, first joint conical, slightly arcuate, second small, rounded, 

 3 — 9 moderately elongate, (10 — 11 are wanting). Prosternum long 

 before the coxse, and moderately widely separating them, prolonged 

 obtusely and meeting an emargination of the mesosternum. Anterior 

 coxse oval, not more prominent than the prosternum, with a large 

 trochantin. Mesosternum oblique, excavate in front. Metasternum 

 moderately long, body winged, episterna wide, epimeron very small. 

 Posterior coxse moderately dilated within and slightly separated. 

 Abdomen with segments 1 — 4 nearly equal, fifth longer. Legs moder- 



