NOTES ON THE GLOSSING 



151 



NOTES ON THE GLOSSIN/E. 



The glossing are limited to Africa and the shores of the Arabian 

 Guh". Formerly they existed in North America. 



The Genus contains ten species, which may be distinguished as 



follows : — 



(After Manson.) 



GENUS GLOSSING. 



Large species, length of body at least 11 mm. 



G. longipennis. Thorax with four sharply defined dark-brown 

 oval spots. 



G. pusca. Thorax without spots. 



Small species, length of body rarely reaching 11 mm. 



Hind tarsi black. 



Antennae black. 



Two last joints of front tarsi black. 



G. palpalis. Abdomen not very marked. 



G. tachinoides. Abdomen con- 

 spicuously marked. 



All joints of front tarsi yellow. 



G. bocayci. 



Antennae yellow. 



G. paUicera, 



Two last joints of hind tarsi black. 



Front and middle tarsi yellow. 



G. paUidipes. 



Front and middle tarsi black. 



Abdominal stripe one-third of seg- 

 ment. 



G. morsitans. 



Abdominal stripe one-sixth of segment. 



G. longipalpis. 



They are ordinary looking flies about half an inch long. A strong 

 proboscis stands out horizontally. Both sexes suck blood. The 

 wings are long and close over each other when at rest like blades of a 

 pair of scissors. 



The dorsal aspect of the abdomen is marked by five or more distinct 

 bands. The mouth parts consist of the labrum, labium, hypopharynx 

 or terminal duct of the salivary gland. The labrum and labium 

 together form a suctorial tube for blood and is called the labial cavity. 

 The salivary glands are long convoluted organs lying chiefly in the 

 abdominal segment. 



Head of Ghssina longipalpis, Wied. 

 (After Griinberg.) 



