POLYCYRTUS. 231 



lateral prolongation from the spiracular black line ; obsoletely punctured ; spines short, 

 thick, obtuse. First abdominal segment black beneath, a large black mark above, 

 leaving a broad yellow band at the apex ; second segment broadly at the apex, narrowly 

 laterally, yellow, a yellow mark (somewhat pear-shaped, but with the base transverse) 

 at the base of the black portion ; the other segments yellow, black at the base ; ventral 

 surface entirely yellow. Ovipositor black, scarcely so long as the body. Legs yellow ; 

 the coxse with a broad black mark on the outer side, the hind pair also black at the 

 base on the lower side ; all the femora and the four anterior tibia? and tarsi lined with 

 black above, the hind tibia? broadly black at the base and apex. Wings slightly smoky, 

 nervures black ; areolet longish, narrow, the apical nervure bullated in the centre, the 

 recurrent nervure almost interstitial. 



The largest of the Central-American species, and inter alia easily known by the broad 

 transverse yellow stripe on the black basal part of the metanotum and by the yellow 

 mark in the centre of the black on the second abdominal segment. 



2. Polycyrtus melanoleucus. 



Mesostenus [Polycyrtus) melanoleucus, Brulle, Hist. Nat. Ins. Hymen, iv. p. 204 ; Cresson, Proc. 

 Acad. Phil. 1873, p. 142 \ 



Hah. Mexico, Orizaba, Cordova 1 (Sumichrast). 



It is quite possible that this species may be identical with P. collinus ; but, without 

 an examination of a typical specimen, I am unable to decide this. 



3. Polycyrtus COllinilS. (Tab. X. fig. 2, metanotum and base of abdomen.) 



Niger, flavo-varius ; tibiis posticis nigris ; abdominis segmentis 2° et 3° nigris, apice maculisque 2 lateralibus, 



flavis ; alis hyalinis, stigmate nigro. $ . 

 Long. 17 millim. ; terebra 6 millim. 



Hob. Guatemala, El Eeposo 800 feet (Champion). 



Antennas nearly as long as the body ; the sixth to the twelfth joints clear white, the 

 basal joint white in the centre beneath. Head whitish-yellow, behind and the vertex 

 (except the orbits) black ; face punctured ; base and apex of the mandibles, and the extreme 

 apex of the clypeus, black. Prothorax black ; prosternum, and a broad line on the edge 

 of the pronotum, yellow. Mesonotum black ; two lines at the apex of the middle lobe, the 

 tegulse, the keels of the scutellum, the apical half of the latter, the postscutellum, and a 

 thin line running from the scutellum and postscutellum to the wings, yellow. Metanotum 

 yellow ; the base, a broad line from the latter running down the centre broadly dilated at 

 the transverse keel (the lateral dilatation united to the spiracles, and projecting outwards 

 towards the spines in front), and a line running down from the spiracles (which are in the 

 black line), black. Pleurae white, the centre of the middle depression of the meso- 

 pleura, a small mark in front of it, the mesosternal suture, the metapleural suture, and a 

 somewhat triangular spot over the hind coxa?, black. The upper transverse keel on the 

 metanotum distinct, the metapleura strongly punctured and transversely striated in the 



