ORDER MALLOPHAGA 219 



/Front deeply angularly notched Bothriometopus. 



I Front not angularly notched 9. 



/-Antennse and legs long ; a semicircular oral fossa Lipeurus. 



■ -j Antennse and legs short ; oral fossa narrow, elongate, extending as 

 l a furrow to the anterior margin of the head Oncophorus. 



2. Amblycera. 



a. Tarsi with one claw ; parasitic on mammals 



= Gyropidm, with one genus, Gyropus. 



b. Tarsi with two claws ; parasitic on birds (? except Eoopia) 



Liotheidce. 



LlOTHEID^. 



Ocular emargination distinct, more or less deep i. 



Ocular emargination absent, or very slight ii. 



rForehead rounded, without lateral swellings ; antennae projecting 



. -j beyond the border of the head Colpocephalus. 



I Forehead with strong lateral swellings 3. 



'Antennae projecting beyond the border of the head ; temporal 



angles projecting rectangularly ; eyes large and simple 



Boopia. 

 Antennae concealed in a groove on the under side of the head ; 

 temporal angles rounded or slightly angular ; eye divided by 

 an emargination and fleck 4. 



fMesothorax separated from metathorax by a suture Trinoton. 



\ Mesothorax and metathorax fused without suture Lamobothrium. 

 ("Sides of head straight or slightly concave ; forehead with two 

 ii. -j small laterally projecting labral lobes Physostomum. 



ISides of head sinuous ; forehead without labral lobes S- 



/Body very broad ; metathorax shorter than prothorax Eureum. 

 \ Body elongate ; prothorax shorter than mesothorax 6. 



(Ocular emargination filled by a strong swelling ; sternal markings 

 forming a quadrilateral without median blotches Nitzschia. 

 Ocular emargination without swelling, hardly apparent or entirely 

 lacking ; median blotches on sternum 7. 



'Very large, with two-pointed appendages on the ventral aspect of 

 the hind head ; anterior coxae with very long lobe-like 

 appendages Ancistrona. 



Small or medium, without bipartite appendages of hind head 



Menopon. 



3- 



