1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 671 



Females. 



Antenna? 15-jointecI l. sa licaph idis n . Bp. 



Antenme 14-joiuted L. piceus Cress. /. rapa Curtis, P). 



Antennas 13 jointed L. chenopodiaphidis n.sp! 



Lipolexis piceus Cress. 



Trioxy8 piceus Cress., U. S. Agric. Report, 1879, p. 260. 



? Aphidius (Trionyx) rapes Curtis, Farm Insects, p. 73. 



I can discover no difference between this species and specimens of 

 an insect received from Mr. E. A. Fitcb, of Essex, England, Darned 

 Trioxys rapce Curtis, but tbere is some doubt in my mind as to whether 

 tbis is Curtis's species, as Mr. Marshall, in bis catalogue of British 

 Hymenoptera, places T. rapcv of Curtis in tbe genus Toxares Westwood. 



Tbe species is parasitic on Aphis brassicw Linn., and bas been reared 

 from tbis Apbid by different observers from Florida to California. 



Lipolexis salicaphidis n. sp. 



Male and female. — Length, If mm . Black, smooth, shining; mouth 

 parts pale; tbe antenna are 15 jointed in the female, the 1st joiut of 

 the flagellum about thrice as long as thick, the following joints shorter; 

 in the male there are 16 joints, the joints of the flagellum about equal 

 in length, the terminal joint not being longer than the preceding ; meta- 

 thorax areolated; legs honey-yellow, tbe posterior coxa? at base and 

 their femora, tibia?, and tarsi obfuscated or brown ; abdomen long, lan- 

 ceolate in the female, the petiole dull yellow, the rest of tbe abdomen 

 piceous black; wings hyaline, the stigma and veins pale brown. The 

 petiole in the male shows only a little yellow at base. 



Habitat. — Los Angeles, California. 



Described from six specimens labeled No. 73, received from Mr. D. 

 W. Coquillett, reared from an Aphis on Salix. 



This species can not be the Trioxys salicaphis Fitch on account of the 

 number of antennal joints. 



Lipolexis chenopodiaphidis n. sp. 



Male and female. — Length, 2 to 2± mm . This species is very similar to 

 L. piceus Cress., but tbe female bas but 13 joints in the antenna?, the 

 male 16 joints. All the coxa? in the male are piceous black, the legs being 

 dark brown, tbe knees paler, tbe abdomen dark brown, with pale su- 

 tures in the male; in the female the abdomen is brown, the anterior 

 and middle coxa? and all trochanters honey-yellow; the terminal joint 

 in the female is much longer than tbe preceding joint, while in the male 

 it is not as long as the preceding joint. 



Habitat. — Los Angeles, California. 



Described from five specimens, labeled No. 80, received from Mr. D. 

 W. Coquillett, reared from an Apbid on Chenopodium album. 



