394 BIRDS OF BRITISH GUIANA. 



Genus PACHYSYLVIA Bonap. 



PacTiysyltiia Bonaparte, Consp. Av. i. p. 309, 1850. Type P decurtata 

 (Bonap.). 



Fig. 150. — To show the form of the bill. 



In this genus the smallest members of the family are included. 

 The bill is pointed and the upper mandible is not hooked. Tlie 

 wing is rounded, the third, fourth, fifthj sixth, and seventh 

 primaries longest and subequal, the second about equal in length 

 to the outer secondaries and the first about half the length of the 

 second. The tail is rounded at the tip, the outer feather on each 

 side being about one-fifth shorter than the middle ones. The tarsus 

 exceeds the length of the exposed culmen by about two-fifths. 

 Coloration : male and female similar. 



Key to the Species. 



A. Upper surface green. 

 a. Throat grey. 



a'. Back dark yellowish green ; crown 



of head slate-grey; bill and feet 



dark P. griseiventris, p. 394. 



b' . Back pale yellowish green ; crown 



of head greyish brown; bill and 



feet pale P. thoracicus abariensis, 



h. Throat fawn-colour or ochreous-yellow. [p. 395. 



c'. Throat fawn-colour; tail shorter, 



less than 45 mm P. muscicapina, p. 396. 



d'. Throat ochreous-yellow ; tail longer, 



more than 45 mm P. sclatefi, p. 397. 



B. Upper surface brown P. luteifrons, -p. S98. 



595. Pacliysylvia griseiventris. 



Grey-bellied Wood-bird. 



MylopMlus thoracicus (nee Temm.) Gadow, Cat. B. Brit. Mus. viii. 

 p. 307, 1883 (Bartica Grove); Salvin, Ibis, 1885, p. 204 (Cama- 

 cusa). 



