MONOGRArH OF THE NORTH AMPZRICAN PROCTOTRYPID.E. Ill 



icel to club J joint 1 of fiiuicle somewhat longer than pedicel, joint 3 

 shorter, joints 4 to 8 increasing- in length very slightly. Head and 

 mesonotum very faintly shagreened, but still glistening; lower i^ortion 

 of mesopleura and all of abdomen perfectly smooth. Abdomen sub- 

 ovoid in shape, acutely jjointed at tip. Eadial vein only slightly curved, 

 extending a little more than half way from stigma to tip of wing. 

 General color jet black; all trochanters, femora, and wing veins dark- 

 brown; all tibiie and tarsi lighter brown." {Hotcard.) 



The S is slightly smaller, with the flagellar joints 1 to 7 dentate, the 

 first being 2^ times as long as thick, excluding the pedicel, while the 

 mesopleura are scaly- punctate. 



Haeitat. — United States. 



Tj'pes in National Museum. 



Parasitic on the wheat aphis, Siplioyiophora avenw Fabr. 



Allied to L. stigniattis Say, but relatively larger, and at once distin- 

 guished by the difference in the length of the flagellar joints. 



Lygocerus 6-dentatus, sp. uov. 



(PI. VI, Fig. 8, c?.) 



2 . Length, 1.2™™. Black, coriaceous, faintly sericeous ; mesopleura, 

 coxfe, and abdomen highly polished, shining, impunctured ; legs brown- 

 ish yellow, the coxpe i)olished black; wings hyaline, the stigma semi- 

 circular, brown, the stigmal vein IJ times as long as the stigma; 

 antennfB brown-black, the pedicel and first flagellar joint equal, the 

 last joint longer than the pedicel. 



$ . Length, 1.1™'". Agrees well with the 9 , except that all the fe- 

 mora and the posterior tibi;e are darker, the antennte black, the flagel- 

 lar joints 1 to serrate, with long hairs, the first being scarcely twice 

 as long as thick. 



Habitat. — District of Columbia. 



Types, $ and 2 , in National Museum. 



This species is labeled as having been bred July 22, 1886, from Sarro- 

 thripa ratvayana, on willow ; but evidently the record is unreliable, and 

 in all probability it came from some Aphidid or Cecidomyiid overlooked 

 by the recorder. 



Lygocerus californicus, sp. nov. 



5. Length, 1.1™™. Black, shining, alutaceous; abdomen piceous 

 or obscure, rufous basally; legs brown, the anterior tibiiB and tarsi 

 honey-yellow, the coxae black. Antennie black, flagellar joints 1 to 6 

 serrate, pubescent. Wings hyaline, the stigma semicircular, the stigmal 

 nervure nearly straight, not, or scarcely, longer than the stigma. 



Habitat. — Los Angeles, Oal. 



Type in National Museum. 



Described from a single S specimen reared by Mr. A. Koebele, from 

 a Cocidomyiid gall on Larrm mexiccma. 



