108 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



occiput faintly margined j ocelli 3, arranged nearly in a straight line; 

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



Antennje inserted just above the clypeus, 11-jointed in botli sexes, 

 tlie scape long, extending above the ocelli; in 9 subfiliform, the joints 

 of flagclhun only slightly longer than thick; in $ some of the flagellar 

 joints always dentate or with short hairy branches. 



iNFaxillary palpi 5-jointed; labial palpi 3-jointed. 



Mandibles bidentate. 



Thorax ovoid, the j)rothorax not A'isible from above; mesonotuni not 

 narrowed anteriorly, with 3 impressed lines; scutellum large, longer 

 than wide, subconvex, without a distinct frenum; metathorax very 

 short, rounded posteriorl3\ 



Front wings pubescent, witli a large oval or semicircular stigma, 

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



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

 est, not striate at base. 



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

 not longer than the second. 



A genus parasitic j)rincipally on aphidsid, and probably universally 

 distributed. 



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

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

 or serrate antennine, while the females are separated with difficulty; 

 the non-pubescent or but slightly i)ubescent 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 distinguisli them. 



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

 the following table, except possibly L. trit'wum Taylor, which at one 

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

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

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

 ard's species: 



TABLE OF SPECIES. 



FEMALES. 



Legs, inchuliug cox.tp, uniformly reddisli-yellow L. floridanus Ashni. 



Posterior coxib black ; legs pale brownish. 



Anteiina3 black, scape pale brownish beneath; first tlagellar joint as long as 



the pedicel L. picii'ES, ep. nov. 



All coxai black. 



Legs black, tibiae piceous, knees, anterior tibite, and all tarsi, honey-yellow. 

 Antenna; wholly black; first llagellar joint not qiiite as long as the pedicel. 



L. STiGMATUS Say. 

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



Mesoplenra ahnost smooth ; autennse black, the first flagellar joint much 



longer than the pedicel L. nigek How. 



