410 HTMENOPTEEA. 



the mandibles black. Thorax stout ; parapsidal furrows obscurely indicated in front ; 

 scutellum longer than broad, narrowed towards the apex ; an oblique furrow below the 

 point of insertion of the fore wings ; metanotum gradually sloping to the apex, with 

 an obscure keel down the centre, and irregularly punctured on either side of the keel. 

 Abdomen elongate ovate ; if anything shorter than the head and thorax united ; petiole 

 smooth, shining, and with a shallow furrow on either side. Wings : the tegulae black ; 

 the transverse pobrachial nervure received in the basal fourth of the cellule ; the 

 recurrent nervure in front of the transverse cubital, the cubitus being angled where it is 

 received ; the second cubital cellule at the apex not half the length of the base ; the 

 cubitus nearly complete. Legs stout, densely pilose. 



CALYPTUS. 



Calyptus, Haliday, Ent. Mag. iii. p. 128 (1835), 



Brachistes, Wesmael, Nouv. Mem. Acad. Brux. ix. p. 110 (1835). 



A genus of small extent, found in Europe, North America, and Mexico. 



1. Calyptus mexicanus. 



Calyptus mexicanus, Cresson, Canad. Ent. iv. p. 229 ( £ ) x . 

 Hob. Mexico, Orizaba (Sumichrast 1 ). 



PYGOSTOLUS. 



Pygostolus, Haliday, Ent. Mag. ii. p. 459 (1834). 



I am somewhat doubtful if the species here described belongs to this genus. 



l. Pygostolus (?) sonorensis. 



Luteus, pedibus pallide testaceis ; alis hyalinis, nervis fuscis, stigmate pallide flavo. $ . 

 Long. 6*5 millim. 



Eab. Mexico, Northern Sonora (Morrison). 



Antennae longer than the body, the flagellum covered with a stiff sparse microscopic 

 pile ; the basal joints slightly oblique at the apex. Face sparsely punctured, especially 

 above, paler than the vertex ; clypeus broadly rounded. Thorax shining, the meso- 

 notum obsoletely punctured ; scutellum very shining, a large, depression, punctured 

 and keeled down the centre, at its base, the scutum on either side of it striated ; meta- 

 notum irregularly striated and punctured. Abdomen scarcely so long as the thorax ; 

 the petiole obscurely striated and punctured, and shorter than the second segment ; the 

 other segments impunctate, the apical one covered with a pale pile ; ovipositor not 

 projecting. Wings large : the first abscissa of the radius shorter than the second ; the 

 transverse humeral nervure received a little in front of the transverse basal nervure ; 

 the recurrent nervure nearly interstitial ; the second cubital cellule at the apex twice 

 the width of the base. 



