446 HYMENOPTEKA. 



The group of D. melanocephalus. 

 Vertex convex, not depressed ; occiput transverse ; ocelli in a triangle ; eyes parallel ; 

 third joint of the antennce about one third longer than the first ; head well-developed 

 behind, narrowed behind the eyes ; prothorax shorter than the mesothorax ; para- 

 psidal furrows almost complete. 



4. Dryinus melanocephalus. (Tab. XIX. figg. 15, 26, var.) 



Niger, thoraee, ore, antennarum articulis l°-5 m , femoribus tibiisque anticis rufis, mesosterno basique femorum 



anticorum nigris ; alis hyalinis, fusco-bifasciatis. 

 Long. 4-5 millim. 



Eab. Panama, Bugaba, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



Antennae stout, thickened towards the apex, sparsely pilose. Head covered with 

 rather long white or fuscous pubescence ; coarsely rugose, the rugae running into 

 reticulations. Eyes margined. Thorax covered with long white hair, sparsely punc- 

 tured, the metanotum at the sides transversely striolated ; prothorax laterally deeply 

 excavated ; mesonotum almost impunctate ; the parapsidal furrows deep, wide, not 

 reaching to the scutellum. Abdomen shining, impunctate. Legs covered with rather 

 long white hairs ; anterior tibiae considerably thickened. 



The amount of red on the legs varies ; the tegulae are black, and usually the 

 mesonotum near them is marked with black ; the tarsi are more or less marked with 

 testaceous ; and the base of the abdomen beneath is sometimes piceous-red, and the 

 apex is sometimes testaceous. 



5. Dryinus nigricans. (Tab. XIX. fig. 8.) 



Niger, coxis troehanteribusque anterioribus albis, ore, mandibulis, apice tarsorum, antennarum articulis 5° et 6" 



abdominisque apice testaceis ; alis fumatis, basi et fascia medio hyalinis. § . 

 Long. 6 millim. 



Eab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



Antennae pilose, thickened towards the apex; the basal joint whitish beneath, and 

 scarcely twice the length of the second. Head and thorax opaque, finely punctured, 

 densely covered with white hair ; parapsidal furrows distinct, but not very broad or 

 deep ; the furrow in front of the scutellum wide and deep ; metanotum finely punc- 

 tured, obscurely reticulated towards the base. Abdomen smooth, shining, impunctate, 

 and as long as the thorax. The femora bear some rather long scattered hair, and the 

 tibiae and tarsi are covered with a closer and thicker pile ; the anterior femora are 

 considerably thickened, and whitish beneath. Wings : the radial nervure is angled in 

 the middle, and extends to the apex ; the transverse humeral nervure is received shortly 

 before the transverse basal nervure ; the stigma is black, white at the base ; the extreme 

 base, a fascia in front of the transverse basal nervure, and a stripe in front of the 

 stigma are clear white ; the apex is fainter than the middle portion. 



