418 



PROCEEDINGS OF THE ACADEMY OP 



abruptly curved; gongs greatly convex; lower mandible trun- 

 cated, the terminal outline rounded when viewed laterally, but in 

 front divided by an angular notch (Fig. 3) ; upper tomium with a 

 more or less prominent festoon. Cere almost covered by fine hair- 

 like bristles, which are strongly recurved on the top. Nostril 

 broadly oval, or nearly circular, against the anterior edge of the 

 cere. Orbital region and superciliary shield perfectly bare, the 



Fig. 5. 



Fig. 4. 



M. zonothorax. Nat. size. 



latter very prominent and exposed for its whole length, as in Falco. 

 Tarsus more than twice as long as the middle toe, scarcely feathered 

 below the knee; its scutellrc of a hexagonal form, and arranged in 

 longitudinal series larger in front and behind, where they some- 

 times form a continuous frontal and posterior series of rather 

 quadrate plates. (Figs. 4, 5.) Top of the toes with irregular, 



