•« t 



396 



Say^s Descriptions of 



the soft, decomposing sap-wood of the Oak and Hickory, 

 between the bark and the solid wood. Their cells are 

 oval, horizontal, not symmetrically disposed, though 

 many are parallel. 'These cells are composed of particles 

 of the decayed wood, agglutinated together. Each cell 

 contains an individual, subsisting on a yellow pollen, 

 enclosed with it by the parent. In the same assemblage 

 are the young of all ages to the perfect insect. 



The male varies in having the tibias and tarsi yellowish- 

 white, with more or less of green on the middle of the 

 posterior tibiae. 



The preceding species, distinguished by their polished 

 green color, are also remarkable by the very obtuse emar- 

 gination of their eyes, or, in other words, the curvature 

 of the inner side of the eye : th^ might very properly 

 constitute a division of the genus. , 



5. H. ligdtus. Black ; tergum banded with whitish. 



Inhab. United States. , * 



$ Body black, with whitish cinereous hairs on the 

 head and stethidium z^otng'Scale honey-yellow: wings 

 hyaline, tinged with yellowish towards the base ; post- 

 costal nervure black ; first recurrent nervure entering the 

 second cubital cellule near, but not at the dividing ner- 



4 



vure : metathorax at base bavinor tbp dpnrps.qed surface 



granulated 



tergum 



margins of fbe segments white with prostrate bair, be- 

 neath which the surface is piceous : venter a little hairy ; 

 posterior margins of the segments obscurely piceous : feet 

 tinged with piceous, paler towards their, tips ; the posterior 

 with pale ferruginous hair. 



Length about three tenths of an inch. 



g Antenna beneath, ochreous, excentinff the first and 



