NORTH AMERICAN TETRASTICHUS BURKS 539 



TETRASTICH US GELASTUS, new species 



Black, with very faint iridescent reflections, area of head around 

 mouthparts, base of gaster, front and middle coxae, and inner side of 

 hind coxae, trochanters, and most of femora tan or brown ; antennae, 

 bases and apices of femora, and tibiae and tarsi light yellow or white. 



Female. — Length, 1.8 mm. Antennae inserted dorsad of level of 

 ventral margins of compound eyes, apex of scape not reaching level 

 of anterior ocellus; first funicle segment one and one-half times as 

 long as pedicel, second segment as long as pedicel, third segment 

 slightly shorter than second, club twice as long as second funicle seg- 

 ment; length of malar space one-half as great as height of compound 

 eye; a broad, rather poorly defined groove extending obliquely from 

 antennal bases to ventral margins of compound eyes ; postocellar line 

 one and one-half times as long as ocellocular ; interocellar triangle with 

 several large, closely set punctures. Mesopraescutum with several 

 longitudinal rugae on median area, confused, somewhat oblique and 

 very irregular, elongate punctures on lateral areas, and two or three 

 irregular rows of bristles present at each lateral margin; inner tri- 

 angular part of scapula almost smooth, remainder of scapula strongly 

 sculptured ; mesoscutellum with deep, irregular, somewhat transverse 

 folds on median sector, two lateral sectors with longitudinal rugae 

 principally, small dorsal area of mesepisternum almost smooth, rest 

 of thoracic pleuron strongly sculptured ; submarginal vein of f orewing 

 with three or four dorsal bristles, stigmal vein short, slightly less than 

 one-fourth as long as marginal vein; apex of hindwing blunt, fringe 

 at posterior margin one-third as wide as wing at hamuli ; metacoxa with 

 an irregular longitudinal carina along outer dorsal and ventral 

 margins. Surface of propodeum strongly sculptured, median, para- 

 spiracular, and oblique carinae present, area between spiracle and 

 paraspiracular carina extremely wide, spiracles contiguous with 

 anterior margin of propodeum ; surface of gaster smooth, one and one- 

 quarter times as long as thorax. 



Male. — Unknown. 



Type locality. — Lutz, Fla. 



Types.— -U.S.N. .M. No. 56240. 



Described from the female holotype and three female paratypes, 

 reared from nymphs of a psyllid. Trioza sp.. on Chinese elm, June 18. 

 1939, by W. Kersey. 



TETRASTICHUS MALACOSOMAE Giranlt 



Tetrastichus malacosomae Girault, Insecutor Inscitiae Menstruus, vol. 4, p. 110, 

 1916.— Porter, Ent. News, vol. 28, p. 186, 1917— Leonard. New York (Cornell) 

 Agr. Exp. Stat. Mem. 101. p. 984, 1928. 



