122 CVXri'inorS GALLS JXD r,.\T L.-WASH'S—ASJIMEAD. VOL.XIX. 



anteriorly which extend to the middle ol" the niesonotuni, the groove on 

 the shonkiers h>ng, distinct. Scutelhini rugose, Ibvese hirge, confluent; 

 mosoplenra i)nnctute, except a small, smooth, glal»r<)us spot just beneath 

 the insertion of wings. Abdomen sliining, with a lew hairs on side of 

 the second segment near the base. Wings hyaline, ])ubescent, veins 

 brown, areolet and cubital cell closed; the radius extends to the mar- 

 gin, but not the ai)exof the subnuirginal vein. At base of the marginal 

 cell is a small, slightly dusky cloud. 



Type.—^o. oOTO, U.S.KM. 



One female specimen, reared at St. Louis, Missouri, by Dr. ( '. \ . Uiley, 

 .July -, 1S77. The gall occurs on <^)iiervHs ruhniin. 



Ifi. ANDRICUS PERPLEXUS, new species. 



Gall. — A small globular gall, somewhat pointed at apex and covered 

 externally with an exceeding tine, short, grayish ])ubescence or bloom. 

 Internally the larval cell occupies most of the gall. Diameter, 5 mm. 



Galljhj. — Female. Length, 2.8 mm. Head, anteunie, legs — except 

 the middle and posterior tibial, which are dark brown — and collar pale 

 brown, eyes and thorax dark brown, pleura and abdomen black, shining. 

 Antenna' 15-joiiited, iiubesccnt, the terminal joints slightly incrassated. 

 Head and thorax minutely coufluently punctate; parapsidal grooves 

 distinct, two short median grooves anteriorly and the usual groove on 

 the slumlders. Scutellum rugose, rounded, the fovea' at base large, 

 deep, and ai)proximate. The abdomen is of the usual shape .with only 

 a few sparse hairs on the side of the second segment. Wings hyaline, 

 pubescent, veins brownish, the submargiiml and median veins basally 

 yellowish. The areolet is exceedingly small, contracted, almost obso- 

 lete, cubital cell closed, the vein at base of marginal cell a little 

 angulated. 



Type.—l^o. 3071, U.8.IT.M. 



One specimen, reared November 21, 1877. The gall was found on 

 the ground in O'Fallen Park, ^Missouri, in October, and the species of 

 oak upon which it grows is unknown. 



17. ANDRICUS IMBRECARiiE, new species. 



G<dl. — A brownish, hard, globular gall, from 7 to 10 mm. in diameter, 

 is.suing, usually several together, from a fissure in a twig of Quervus 

 imhreearia and (^>. ilirifolia. The larval cell is nearly always closely 

 cemented to the thick, hard, outer rind, but in a single instance there 

 are a few fibers sei)arating it. 



GnllfJy. — Female. Length, 4.G mm. A'ariable in color from a pale 

 brown to a reddish brown; eyes daik brown; the antenna' dusky or 

 black toward tips. Head and thorax shining, but with a delicate 

 I)unctuation. Antenme 14-Jointed, sparsely' i)ubescent, the terminal 

 joints delicately fluted. Parapsidal grooves of mesonotum distinct, 

 broadened posteriorly. The longitu<linal mediian groove posteriorly is 



