BEACON. 315 



Central portion of the petiole broad at the base, narrowed towards the apex. 



1 (2). Palpi and legs black; the face over the elypeus roughly crenulated; 



the cheeks strongly punctured gracilescens. 



2 (1). Palpi and fore tibiae and tarsi white; the face over the elypeus and 



the cheeks not very strongly punctured albipaljpis. 



% 3. Bracon albipalpis. (Tab. xin. fig. 7.) 



Niger ; abdomine rufo, apice nigro ; palpis, trochanteribus, basi femorum, tibiis tarsisque anterioribus, albis ; 



alis nigris. <$ . 

 Long. 10-5 millim. 



Hab. Panama, Bugaba (Champion). 



Head large, cubital, strongly developed behind the eyes, broader than the meso- 

 thorax ; smooth, shining, the sides of the face closely rugose ; elypeus scarcely projecting, 

 a narrow, sharp, semicircular carina at its base ; the depression in front broad, reaching 

 to the hinder ocelli, without a distinct ridge in the centre, the depression between (and 

 below) the antennae wide and deep. Thorax shining, impunctate. The raised central 

 part of the petiole has straight sides and is deeply depressed at the base, the depression 

 extending to the middle ; the lateral furrow is deep and wide, and originates a little 

 before the middle ; the furrow down the side of the second abdominal segment deep ; 

 the suturiform articulation is wide and deep, its bend in the middle somewhat sharp, 

 not forming a semicircle. Abdomen longer than the head and thorax together, bulging 

 out in the centre, where it is distinctly broader than the mesothorax ; the last segment 

 forms a membranous projection, incised in the middle, over the last ventral one. 



4. Bracon gracilescens. (Tab. xm. fig. 9.) 



Niger, nitidus; abdominis segmentis l°-4 m rufis, terebra quam corpus fere longiore; alis faliginosis. $. 

 Long. 10 millim. ; terebra fere 11 millim. 



Hab. Nicaeagua, Chontales (Janson). 



Similar in coloration and sculpture to B. frustratus, but much narrower and some- 

 what smaller; the elypeus is not so projecting, and there is no semicircular ridge at its 

 base ; the depression above the antennae is not so deep, nor is it divided in two by a 

 sharp and distinct ridge ; the middle lobe of the mesonotum is not so sharply separated 

 and raised above the lateral one ; the abdomen is longer, and distinctly longer than the 

 head and thorax together; the ovipositor is shorter; and the second cubital cellule 

 is longer. 



2ss2 



