188 WILLIAM H. ASHMEAD. 



Described from one S and two 9 > labeled No. 2640 received from 

 Dr. Wittfeldt, of Georgiana, Fla., reared March 24, 1882, and from 

 a smaller form,' but H mm. in length, labeled No. 780 P, reared 

 July 3, 1883, from a gall found on Quercas alhn near the Merrimac 

 River, Ma.ssachusetts. 



This latter may be a distinct species, but I could detect no good 

 charac!ters to se])arate it. 



PERI€L,I!f$TlJS Forster. 



Fericli!^tu!<$ MiiiilaciM n. s]). 



9- — Length 2.8 mm. Black, siib()i)aqiie, densely, minutely punctulate; an- 

 tennsB ferriifrinous. Legs brownish yellow, all the coxte dusky hasally, the pos- 

 tei'ior pair usually black, the anterior pair sometimes concolorous with the legs; 

 palpi pale. Head finely, conHuently punctate, almost smooth and slightly shin- 

 ing on the vertex, the face pubescent, with a di.stinct medial ridge. Thorax more 

 densely punctulate, the parapsidal grooves distinct throughout, a long median 

 groove posteriorly and „wo short grooves between the parapsides anteriorly, wliile 

 on the shoulders is a distinct, rather long grooved line; mesopleura smooth, 

 highly i)olished. bare on the disc, pubescent beneath wing and along the nieso- 

 sternum : scutelluni rugose, the fovea? at base, large, transverse, nearly confluent. 

 Abdomen ])olished black, slightly pubescent hasally, the ovipositor sheaths dis- 

 tinct, projecting. Wings hyaline, pubescent, the veins ])ale yellowish, the neura- 

 tion as in piratiix. 



The % differs from 9 only in its smaller size, being but 2 mm. long, and in the 

 usual sexual diflerences; the antennae are 14-jointed, the thiid joint being strongly 

 eniarginated. 



Described from thiiteeu s])ecimens, labeled No. 864, reared April 

 28, 1871, and four numbered 1010, reared February 4, 1884, from 

 Diadrojj/uii .ii)dlaci.'< Ashm. 



I'ericlisf us californicus n. sp. 



% 9- — Length 2-2.4 mm. Similar to P. smilacis, the punctuation finer, the 

 pubescence denser, antennse dark brown. Legs reddish yellow, sometimes ob- 

 fuscated, the middle and posterior coxte lilack, shining. The parapsidal grooves 

 are only distinct on the posterior half of the mesonotum, entirely wanting antc- 

 liorly, and there is no distinct grooved line on the shoulders, while the shoit 

 anterior median grooves are wanting: scntellum rugose, foveas large, distinct. 

 ohli(iue; mesopleura smooth, highly polished. Wings hyaline, jxihescent, irides- 

 cent, veins brown, the areolet large, cubital and marginal cells ('losed. Abdomen 

 densely black, higlily i)olished. 



Descril)ed from nine specimens, labeled No. 12"), reared during 

 July, 188(i, by Mr. Albert Koebele from RhoiVde.-^ polita A.shm. and 

 numerous other specimens labeled No. 3839, reared at the Depart- 

 ment during Jjinuary and February, 1886, from the sam(> gall col- 

 lected in Wyoming and Colorado. 



