420 HTMENOPTERA. 



shining, impunctate, or nearly so. Prothorax above transversely striolated, laterally 

 obliquely striolated, except on the oblique broad furrow, which is only striolated on the 

 sides. Mesonotum strongly transversely striolated, the centre marked with large coarse 

 punctures. Scutellum impunctate in the centre, the sides with large punctures. Meso- 

 pleurae shining, bearing large, round, clearly separated punctures. Metapleurae with a 

 large, shining, impunctate, oblique depression (narrow at the base), the A-shaped 

 projecting part behind it rugosely punctured ; in front of this latter is another large, 

 shining, impunctate space. Metanotum strongly punctured, the punctures more widely 

 separated at the sides ; there is a wide furrow on either side, which does not reach the 

 base. Petiole striolated as in the allied species, as long as the following three segments 

 united. The apical segments are finely aciculated, and have a few minute punctures, 

 and laterally bear at the apex a sparse fringe of pale fulvous hair. Hind coxae irregu- 

 larly striolated, shining. Hind femora shagreened; the basal tooth a little longer and 

 stouter than the apical one : there are four teeth between these (of which the basal 

 one is the longest and the second the stoutest), and four teeth behind the large apical 

 one (the first the largest, the others becoming gradually smaller). The thickened apical 

 part of the hind tibiae is shagreened. The metatarsus is about one third longer than the 

 other two joints united ; at the apex and on the second joint is a thick brush of fulvous 

 hair. The body and legs are sparsely covered with long pale hair; the anterior tibiae 

 and tarsi thickly pilose. 



2. Megischus niger. (Tab. XVIII. fig. 19, $ .) 



Megischus niger, P. Smith, Trans. Ent. Soc. Lond. 1862, p. 44 (?) \ 



Hab. Guatemala, Panzos and Teleman in Vera Paz (Champion) ; Panama (Stretch 1 ). 



This is probably only a form of M. annulator. Compared with the Guatemalan 

 specimens of the latter, it has the body darker, the eyes with scarcely any red, and the 

 wings not suffused with fuscous ; the body and legs are less pilose, and the puncturing 

 on the pleurae is much less distinct. 



3. Megischus ruficeps. (Tab. XVIII. fig. 9, $ .) 



Niger, capite rufo ; alis fere hyalinis, $ . 

 Long. 19 millim. ; terebra 25 millim. 



Hab. Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion), 



Antennae very slender, about two thirds the length of the body ; the scape thick, 

 twice the length of the second joint; the third joint as long as the scape, and shorter 

 than the fourth joint ; the flagellum bears a few hairs. Head deeply rugosely strio- 

 lated, except behind the eyes ; palpi very long, black ; tips of the mandibles black, 

 striolated. Prothorax above in front coarsely transversely striolated ; behind finely 

 striated. Mesonotum irregularly transversely striolated. Scutellum shining, impunc- 



