376 PROCEEDINGS OF THE NATIONAL MUSEUM vol 83 



17. Cheeks straight or nearly straight (sometimes convexly rounded 



in males) ; head somewhat, although only very slightly, trans- 

 verse (at least in females), sometimes subtriangular; wings 

 with a gray-brown or infuscated spot or cloud below marginal 

 vein; scape in male broadened almost throughout whole 

 length; small individuals, as a rule no more than about 2 mm 



long stygicus Provancher 



Cheeks convexly rounded (sometimes only slightly so) ; head 

 in front view with very rare exceptions distinctl}' transverse, 

 not subtriangular; wings hyaline, although rarely with a 

 faint indication of a cloud below marginal vein; male un- 

 known; larger individuals, usually more than 2 mm in length. 



fulvicornis prothoracicus, new variety 



18. Cheeks convexly rounded (rarely almost straight); head in 



front view distinctly transverse, rarely nearly as long as 

 broad and rarely subtriangular. Notum of thorax black 

 (punctate portion sometimes bronzy) ; walls or interspaces 

 between umbilicate punctures on mesoscutum and scutellum 



thin, mere septa, the punctures angulated fulvicornis Ashmead 



Cheeks straight or nearly straight; head in front view ranging 

 from somewhat elongate to distinctly transverse, usually 

 subtriangular 19 



19. Head in front view more or less distinctly transverse; punctate 



portion of notum of thorax, except rarely, bronzy or bronzy 

 black; area along inner margin of parapsides as a rule with 

 a greenish or bronzy tinge; interspaces between umbilicate 

 punctures on mesoscutum or scutellum or on both, medially, 

 usually slightly widened, punctures with more conspicuously 



thickened walls round or roundish similis Crawford 



Head somewhat elongate or only slightly transverse; notum of 

 thorax black; area along inner margin of parapsides only 

 very rarely greenish; walls or interspaces between umbilicate 

 punctures on mesoscutum and scutellum thin, mere septa, 

 punctures angulated 20 



20. Frons meeting vertex in more or less of a curve; emargination 



of frontovertex apparently never very pronounced 8; post- 

 marginal vein usually distinctly longer than stigma) vein, 

 its apex usually merging with darkish costal border of wing 

 and indistinct; small individuals, thorax very distinctly less 



than 1.5 mm in length muesebecki, new species 



Frons meeting vertex in a more or less sharp keel; emargination 

 of frontovertex usually conspicuous (best marked in males) ; 

 postmarginal vein as a rule as long or only slightly longer 

 than stigmal vein and usually clearly defined at apex; larger 

 individuals, thorax about 1.5 mm long robertsoni Crawford 



PERILAMPUS CAROLINENSIS, new species 



Female. — Length about 4.5-5.5 mm. Head: Frons with a carina 

 extending from behind the anterior ocellus downward on each side of 

 the scrobal cavity to beyond the level of the insertion of the antennae, 

 carina prominent and lower portion sharply curving toward eye 

 margin; frons laterad of the carina with large, shallow, irregular 



• Head viewed dorsally. 



