FOSSIL PARASITIC HYMENOPTERA FROM BALTIC AMBER. 341 



becoming slightly moniliform; last joint oval, one-half longer than 

 the preceding. Thorax above shagreened, but little convex; the pro- 

 pleurse below the suture smooth and shining. Pronotum almost twice 

 as long as the mesonotum, its pleural piece with slight longitudinal 

 striate sculpture. Mesonotum about twice as wide as long, its 

 anterior and posterior margins nearly straight; with two fine but very 

 distinct parapsidal furrows, which are interior apically to the small 

 fovea? at the base of the scutellum; the latter as long as the mesono- 

 tum, with a delicate impressed line at the base connecting the fovea?. 

 Propodeum margined behind and at the sides in addition to a median 

 carina; its pleura? microscopically reticulated and its posterior face 

 shagreened. Mesopleural piece very convex; its discal fovea small, 

 distinct, equidistant from the upper and hind margins of the meso- 

 pleura, nearly twice as far from its oblique anterior edge. Abdomen 

 rather slender, one-fourth longer than the elongate thorax; second 

 segment the longest, the following gradually decreasing in length. 

 Legs very much thickened; anterior femora nearly one-half as broad 

 as long. Tarsal claws apparently with a single tooth near the base. 

 Wings fully developed, quite strongly infuscated. Radial cell com- 

 plete, broadly rounded at the apex. Median cell nearly as long as 

 the submedian; closed discoidal cell small, much narrowed basally, 

 being nearly ovate in form; closed cubital cell large, two-thirds as 

 long and nearly as broad as the radial. 



One finely preserved specimen, without number. 



Sierola setigera sp. nov. 



9 . Length 3.2 mm. Head in front but little convex, nearly flat 

 on the front below the vertex. Median carina of clypeus very strongly 

 elevated anteriorly, extending but little on to the front above the 

 clypeal suture. Eyes oval, nearly twice as long as wide, not, or very 

 indistinctly pubescent. Ocelli large, in a moderately small triangle 

 close to the occipital margin. Head seen in side view, quite strongly 

 triangularly prolonged behind the eye for a distance nearly equal to 

 the width of the eye. Mandibles rather narrow, indistinctly biden- 

 tate at the tips; palpi 5-jointed. Antenna? slender; scape broad and 

 flattened toward the apex; 13-jointed, all the joints longer than thick. 

 Pedicel slender, a trifle longer than the first flagellar joint; following 

 joints a little shorter; those near the middle of the flagellum about 

 twice as long as thick; near the tip one-third longer than thick; 



