ART. 23 REVISION OF MACROCENTRUS MUESEBECK 25 



Testaceous ; head entirely yellow except the ocellar triangle which 

 is black ; antennae yellow ; palpi very pale yellow ; thorax and abdo- 

 men honey-yellow; legs bright honey-yellow; wings hyaline; veins 

 brown ; stigma entirely yellow, 



Type.—V.S.^M. No. 43499. 



Type locality. — Pennsylvania. 



Bem^rks. — Described from four female specimens, the type and 

 two paratypes, labeled " Pa. 1573, C. F. Baker collection," which are 

 in the National Museum, and one paratype in the collection of the 

 Boston Society of Natural History, which was taken on the island 

 of Marthas Vineyard, Mass., July 29, 1929, by F. M. Jones. This 

 specimen has the antennae 55-segmented. 



15. MACROCENTRUS RETICULATUS, new species 



Distinguished from all related species by the unusually strongly 

 rugoso-reticulate propodeum and the coarse sculpturing of the 

 metapleura, combined with a long, closely ruguloso-aciculate first 

 tergite with the spiracles near end of basal third. 



FemaLe. — Length 5.5 mm. Head but little wider than greatest 

 width of thorax; face scarcely convex, smooth; eyes large, very 

 prominent; malar space fully as long as basal width of mandible; 

 clypeus strongly convex, not more than one and one-half times as 

 broad as long, weakly broadly emarginate at apex; maxillary palpi 

 long, the longest segment longer than second segment of antennal 

 flagellum: antennae longer than the body, 46-segmented. 



Thorax rather stout, broadest posteriorly; prescutmn strongly 

 convex, prominent; notauli foveolate posteriorly; propodeum un- 

 usually coarsely rugoso-reticulate, the sculpturing not transverse; 

 impression on lateral face of pronotum unusually broad and deep 

 anteriorly and coarsely foveate; lower part of mesopleura conspicu- 

 ously depressed and strongly confluently punctate; prepectus com- 

 pletely margined and more or less rugulose ; metapleura mostly rugu- 

 loso-punctate ; legs very long and slender; apical teeth of trochan- 

 ters rather weak ; posterior femora longer than coxae and trochanters 

 combined; posterior tibiae very long; radius arising from very 

 slightly beyond middle of stigma; radial cell not quite attaining 

 wing apex; first discoidal cell long; nervulus postf ureal by about 

 half its length or slightly more; submedian cell with a hairless 

 area apically; nervellus very slightly shorter than lower abscissa 

 of basella, the latter a little less than half as long as mediella. 



Abdomen slender, considerably longer than head and thorax com- 

 bined ; first tergite long and narrow, nearly three times as long as 

 wide at apex, closely longitudinally ruguloso-striate, subopaque; 

 second tergite much longer than wide, completely closely striate with 

 98306—32 4 



