POLYCYSTTTS. 237 



line running to the postpetiole, which is also black, except at the apex. The second 

 segment is black, broadly yellow at the apex ; a thin lateral spot at the base, and a 

 larger one in the centre of the black part. The other segments black, except at the 

 apex ; the black on the apical segment smaller and narrower from the centre. Ventral 

 surface yellow, the segments lined with black. The four anterior coxae have a black 

 line at the base and a larger black spot at the apex ; the hind coxae are broadly lined 

 with black down the centre, which is hollowed and transversely striated and punctured. 

 Areolet longer than broad, the outer nervure bullated. 



15. Polycyrtus acerbus. 



Polycyrtus acerbus, Cresson, Proc. Acad. Phil. 1873, p. 144 ( ? )\ 

 Eab. Mexico, Orizaba 1 (Sumichrast). 



16. Polycyrtus macer. 



Polycyrtus macer, Cresson, Proc. Acad. Phil. 1873, p. 144 ( <$ ? )\ 

 Eab. Mexico, Cordova x (Sumichrast). 



17. Polycyrtus guatemalensis. (Tab. X. fig. 9, metanotum and base of 

 ^abdomen.) 



Niger, flavo-varius ; apice scutelli flavo, dimidio basali tibiarum posticarum nigris ; alis fere fumatis, stigmate 



nigro. S • 

 Long. 16 millim. 



Eab. Guatemala, Purula (Champion). 



Head black above the antennae, except the orbits ; the apex of the clypeus and the 

 base of the mandibles black ; spine longish, stout, not tapering much towards the apex ; 

 a carina runs from its sides to the eyes, another obliquely upwards and another less 

 strongly defined from its centre upwards. Prothorax black, except the prosternum and 

 a broad mark on the edge. Mesonotum black, except two lines at the base of the 

 middle lobe, which has a short keel in its centre at the base. Scutellar keels and the 

 apex of the scutellum, broadly yellow. Pleural sutures black. Near the base of the 

 metanotum is a transverse, rather wide depression, which is black, the black touching 

 the extreme base in the centre ; from this a broad black line runs down the centre 

 and a narrower one runs down the sides from the spiracles ; over the hind coxae is a 

 black mark. The metathorax is not very much shorter than the mesothorax ; it has a 

 gradual slope to the apex ; in the centre is a longitudinal canal ; the sides are trans- 

 versely striated ; the spines are long and curved ; the upper transverse keel is distinct, 

 the lower one obsolete ; the sides in front of the hind coxae project as a blunt tubercle. 

 Petiole black, except laterally and beneath ; postpetiole yellow at the apex. Second 

 segment with a large black mark, which occupies three fourths of it, and has a small 



