396 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 83 



PERILAMPUS ROHWERl. new species 



Female. — Length about 2-3 mm. Head: Frons without a carina, 

 meeting vertex in a curve; emargination of fron to vertex subacute 

 or not markedly obtuse; ocellocular area and front between eye and 

 scrobal cavity smooth (rarely, in the males at least, in part faintly 

 wrinkled); malar furrow more than half the width of cheek at apex; 

 clypeus wider than long and usually longer than hyperclypeal area; 

 cheeks convexly rounded and smooth; head in front view more or 

 less distinctly transverse; eyes reaching or about reacliing level of 

 base of clypeus. 



Thorax: Area along inner margin of parapsides smooth ; umbilicate 

 punctures on mesoscutum and scutellum angulated, the interspaces 

 thin, although here and there and especially at base of scutellum a 

 wall may be thickened; scutellum not or at most only slightly broad- 

 ened apically; pronotum laterally as long as or not much shorter 

 than dorsal margin of prepectus, the margins of latter converging 

 ventrally into a single carina; axilla Vv^ith a triangular or roughly 

 triangular extension on side of scutellum, this extension as wide as or 

 wider than long and with its base extending above middle of axilla, 

 the face of axilla sloping toward base of extension and not depressed 

 or excavated above base of extension; basal shallow furrows on under- 

 side of apex of scutellum not turning caudad medially but meeting to 

 form a single gently curved furrow, rarely meeting at a slight angle; 

 postmarginal vein about three-fourths or more than three-fourths 

 the length of the marginal vein. 



Abdomen: Posterior face broader than long or as long as broad; 

 first tergite strongly transverse, smooth, its anterior margin only 

 slightly elevated, and truncate or nearly truncate, sometimes partially 

 masking posterior aspect of neck of propodeum ; third segment (second 

 of the gaster) not exposed (may be somewhat so in the males). 



Color: Black; notum of thorax very slightly metallic and pleural 

 region sometimes with a greenish or bronzy reflection; head often 

 with blue-green reflections (in males the ocellocular area and upper 

 part of front between eye and scrobal cavity sometimes somewhat 

 bronzy or metallic); flagellum of antenna grayish dull dark brown, 

 obscurely ferruginous at apex and sometimes extensively so beneath; 

 scape greenish or with a green luster; legs brown to blacldsh brown; 

 femora, especially the posterior pair, with a greenish luster (quite 

 green or with a bronzy luster in the males); anterior tibiae pale 

 brown to testaceous except a dark stripe above; tarsi testaceous; 

 wings hyaline, veins brown to testaceous. 



Male. — Length about 2.5-3 mm. Similar to female; part of scape 

 bearing sensorial punctures fairly broad apically and occupying more 

 than one-third but less than one-half of scape, sensoria fairly dense 

 and moderately coarse. 



Type.— v. S.N. M. no. 49780. 



Type locality. — "Canada." 



