—25— 



Female. — Head shining black, with two deep pits at the base of the cly- 

 peus, one on either side; face finely rugose; mandibles black, sometimes 

 yellowish at base; palpi light yellow to yellowish brown. Antennae 14-jointed. 

 first four or five joints light yellow, terminal joints black, first and second 

 joints short and stout, third joint longest, terminal joint cone shaped and a 

 little longer than the penultimate. Thorax shining black and finely rugose, 

 parapsidal grooves distinct; a medium impressed line begins at the scutellum 

 between the parapsidal grooves and extends a short distance upon the thorax. 

 Scutellum polished, bifoveate and more coarsely rugose than the thorax. 

 Abdomen entirely black and polished; ovipositor sheaths slightly exserted 

 and light yellow in color. Wings slightly smoky, and 3 mm. in length, areolet 

 very small or entirely wanting. Feet light yellow, except last tarsus, which 

 is black. Length 2.3 mm. Described from twelve reared specimens. 



Male. — Length 2 mm. The yellow coloration of the antennae shows for 

 nearly the entire length on the under surface, the number of joints is fifteen, 

 and they are more densely set with hairs than in the female. Otherwise as 

 female. Eight reared specimens. 



ON A ROSE BUSH. 



Rhodites multispijiosa n. sp. Gall.* — A large knot-like excres- 

 cence on a young shoot of a species of Rosa. The gall is reddish 

 brown in color and densely set with sharp, stout spines, like those 

 which occur upon stems of the bush. See fig. 2. 



Gall-fly — Female. — Head rufous, almost black beneath the eyes, finely 

 rugose and covered with gray pubescence. A little black shading on the 

 vertex surrounds the ocelli. Thorax rufous, punctured, parapsidal grooves 

 broad, but not deep, and extended to the scutellum. Two naked parallel 

 lines extend a little more than one-third of the distance from the collar to the 

 scutellum between the parapsidal grooves. Thorax, like the head, thinly set 

 with short hairs. .Scutellum more coarsely rugose than the other parts of 

 the thorax and without fovete. Abdomen dark rufous, polished and very 

 finely rugose. Ventral valve black. Antennae i4-)ointed, first three joints 

 rufous, the others black. Wings subhyaline, areolet large, marginal cell open. 

 Length 4.3 mm. 



Male. — Entirely black, except the legs and a little rufous coloring about 

 the ocelli. Legs reddish brown. Antennae 14-jointed, and nearly or quite 

 as long as the body. Length 3.5 mm. Otherwise like the female. 



The gall and flies of this species were kindly loaned me by 

 Prof. Osborn, of the Iowa Agricultural College. 



* This is probably the gall spoken of by Osten Sacken on page 44 of the 

 Proceedings of the Entomological Society of Philadelphia for 1863, Vol. IL ' 

 In Bulletin 7 of the Iowa Experiment Station the specific name spinosissima 

 was given to this insect without noticing the fact that a very similar specific 

 name, spinosissimce had already been used by Giraud for a related European 

 Cynipid. In order to avoid confusion from having two names so similar in 

 the same genus I have thought it best to change the name here to muUispinosa, 



