108 iniLLETIN 45, UNITED STATES NATIONAL MflSEUM. 



occiput faintly iiuirgiuod; ocelli 3, arranjjed nearly iu a straight line; 

 eyes large, oval, .sniootli, or but faintly pubescent. 



Antenna; inserted Just above the clypeus, ll-jointed m both sexes, 

 the scape long, extending above the ocelli; in 9 subflliform, the joints 

 of tiagelluni only slightly longer than thi<'k ; in S some of the flagellar 

 Joints ahva3's dentate or with short liairy branches. 



-Maxillary i)alpi 5 jointed; labial paliu 3-jointed. 



Mandibles bidentate. 



Thorax ovoid, the prothorax not visible from above; mesonotuiu not 

 narro\ve«l anter'orly, with 3 impressed lines; scutellum large, longer 

 than wide, suaconvex, withont a distinct frenuni; metathorax very 

 short, rounded posteriorly. 



Front wings pubescer t, with a large oval or semicircular stigma, 

 and a slightly arcuate stigmal vein, distinctly longer than the stigma. 



Abdomen ovate, smooth, subpetiolate, the second segiuent the long- 

 est, not striate at base. 



Legs finely pubescent, but not pilose, the last joint of posterior tarsi 

 not longer than the sec«md. 



A genus j)arasitic principally on aphidsid, and probably universally 

 distributed. 



The males are readily separated from those in Megaspilns, and in the 

 other genera in the tribe having 3 mesonotal furrows, by the ramose 

 or serrate antennic, while the females are separated with dithculty; 

 the non-pubescent or but slightly pubescent eyes, the mesonotum be- 

 ing as wide anteriorly as posteriorly, and the lateral mesonotal fur- 

 rows, before reaching the anterior margin, (curving .somewhat obliquely 

 toward the anterior angles, will, however, at once distinguish them. 



Our species are not numerous, and may be separated by the aid of 

 the following table, except possibly L. triticum Taylor, which at one 

 time I considered to be identical with L. {Mega,spilus) niger Howard, 

 but which I now consider distinct. Miss Taylor's figure of the male 

 antenme of her species being wholly different from that of Mr. How- 

 ard's species : 



TABLE OF SPECIES. 



FEMALKS. 



Legs, iucluding coxfe, uniformly reddish-yellow L. kloridanus Ashm. 



Postt^rior coxie black ; legs pale brownish. 

 Antenna! black, scape pale brownish beneath; first flagellar joint as long as 



the pedicel L. picipes, sp. nov. 



All coxa* black. 



Legs black, tibiiu piceous, knees, anterior tibiie, and all tarsi, honey-yellow. 

 AntenniP wholly black ; first flagellar joint not qnite as long as the pedicel. 



L. STIGMATU8 Say. 

 Legs black or piceous, the tibiic, and tarsi brownish-yellow. 



Mcsopleura almost smooth ; antenniw black, the first flagellar joint much 



longer thai' the jiedicel L. niueu How. 



