22 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol. 63. 



Described from two specimens (a]360) bred by Dr. E. P. Felt at Albany, New 

 York, April 5, 1907, from a Cecidomyid gall. A thiid specimen (alSl^Q) was reared 

 May 7, 1907. 



The species looks very much like certain species of Folygnotus, but the peculiar 

 swollen condition of the second flagellar joint, characteristic of males of the present 

 genus will readily serve to distinguish it from that very extensive genus. 



Professor Brues does not say anything about the location of the 

 types, but in all probability they are deposited in the museum at 

 Albany, New York. 



4. ERITRISSOMERUS PARVUS, new species. 



Female. — Length 1 mm. Head twioe as wide as long, slightly 

 emarginate behind, a little wider than the thorax; cheeks subconvex, 

 shagreened ; occiput and vertex shagreened, the latter with some incon- 

 spicuous striae medially; frons polished, faintly aciculate laterally 

 and below; antennal process sharp, without a median carina; pedicel 

 as wide as joint four, wider than three, not quite as long as three 

 and four united, twice as wide as long; three nearly as long as four; 

 four very little longer than wide, longer than five and six which are 

 slightly transverse, wider; seven to nine rather broadly transverse, 

 as in cecidomyiae; joint ten a little longer than four, acute apioally, 

 the sides straight; thorax three-fourths as wide as long, strongly con- 

 vex above, as wide as high; pionotum partly shagreened laterally; 

 mesonotum finely shagreened; notauli complete, meeting in a point 

 posteriorly, the median lobe polished near its apex; scutellum as in 

 cecidomyiae; abdomen spatulate, a little wider than the thorax, as 

 long as the head and thorax united, two-thirds as wide as long; first 

 tergite pubescent on the sides; median area quadrate, with several 

 inconspicuous carinae; second tergite as wide as long, twice as wide 

 apioally as basally, the sides not much curved; basal foveae closely 

 striate, the striae attaining the middle of the segment; interfoveal 

 area closely striate; tergites three to six polished, united one-third 

 as long as the second; wings hyaline, extending a little more than 

 the length of the last four segments united past the apex of the 

 abdomen. Black; antenna (except last six joints), anterior legs, tro- 

 chanters, tibiae basally and all tarsi, honey-yellow; rest of legs and 

 antennae piceous. 



Tyi^e locality. — Cabin John, Maryland. 



Type.— C&t. No. 25430, U.S.N.M. Paratype in Collection Fonts. 



Described from two females collected by the author, June 3, 1917, 

 on the leaves of hickory. 



5. ERITRISSOMERUS FLORIDANUS (Ashmead). 



Polygnoius floridanus Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 318. 



Female. — Length 1.20 mm. Very closely ri^ated io parvus Fonts, 

 but with the following differences: Frons .slightly more distinctly 



