DIPTEKA. 83 



clothed with short pale hairs : sucker black, clothed with pale tawny hairs : 

 first and second joints of the feelers black ; second not half the length of 

 the first : chest clothed with tawny hairs : abdomen slightly increasing in 

 breadth from the base till near the tip, longer, but hardly broader than the 

 chest, ferruginous towards the tip, clothed with tawny hairs, which form 

 bands on the hind borders of the segments : legs black, covered with yel- 

 low down ; hind shanks towards the base and feet yellow ; claws black : 

 wings dark gray, tawny beneath the fore border for three-fourths of the 

 length from the base ; wing-ribs and veins ferruginous ; veins black in the 

 gray parts of the wing ; poisers tawny. Length of the body 5^ lines ; of 

 the wings 12 lines. 



Columbia. 



Genus SARGUS, Meujen. 



Sargus debilis, Mas. 



Viridis, capitis macula Jiava, thoracis disco purpiireo-ct/atieo, scutelli apice 

 puj-pureo, ahdomine fulvo ajnce suhccneo, anlennis pedibusque fulvis, 

 alis limpidis. 



Body bright green : head yellow and clothed with pale yellow hairs 

 at the base of the feelers : eyes pitchy ; facets small, somewhat larger in 

 front than elsewhere : mouth pale tawny : feelers tawny ; bristle pitchy : 

 disk of the chest purplish-blue ; tip of the scutcheon purple : abdomen 

 pale tawny, longer than the chest, incieasiug in breadth from the base 

 towards the tip, where the disks of the segments are more or less bronzed : 

 legs pale tavtny : wings colourless ; wing-ribs tawny ; veins pitchy, tawny 

 at the base and along the fore border ; poisers tawny. Length of the body 

 4 lines ; of the wings 8 lines. 



United States. 



CACOSIS, n. g. 



Antennis articulus 3us longus ; seta basi crassa, nigro pubescens. 



Third joint of the feelers longer than that of S. Vespertilio ; bristle 

 thick and clothed beneath towards the base with black ilown. 



