60 H. F. BASSETT. 



of an inch in horizontal, and .08 inch in vertical diameter. Coin- 

 pai-atively few of the galls are single. Most are confluent and of 

 irregular outline, and in some instances the entire leaf is covered, 

 while in others the right or left lobe is thus covered. These galls 

 resemble the European species B. spinosissimce, but the latter are 

 more nearly globular, and their vertical diameter is one-half more, 

 while the horizontal is considerably less. The larval cell is much 

 larger and the walls much thinner than in R lenticularis, and, as 

 will be seen, the insects differ much. 



Gall-flies. — Female. — Head black ; auteunpe short, first three joints very 

 (lark reddish browu, remainder dull black ; first aud second joints globular, 

 third one-half longer than the fourth, fourth slightly longer than the succeeding 

 ones, which are short and thick, and distinct. Thorax black ; mesothorax dull, 

 not shining, finely rugose, and with microscopic hairs ; parapsidal groo%'es smooth, 

 rather large and distinct, only faint ti-aces of the intervening lines that are 

 usually seen in this genus; pleura shining in the middle ; scutellura very finely 

 wrinkled or corrugated. Abdomen shining, deep j'ellowish red. Legs very dark 

 reddish brown. Wings subhyaline, with an exceedingly faint reddish cloud on, 

 and surrounding the radial area ; in many specimens this cloud is scarcely dis- 

 cernible; veins slender, but distinct, second transverse, and those bounding the 

 radial area largest; areolet always present, but a mere dot. Length of the body 

 .08 inch. 



% . — Wings moi-e nearly hyaline, and without any trace of cloudiness. Length 

 .07 inch, (my only % specimen is in poor condition] 



Dr. Rudow states that the third antennal joint of li. .^pinosisslnifF. 

 is three and a half times as long as the fourth. In B. lenticularis 

 the third is only one and a half times as long as the fourth. B. 

 .•<pinosiss{7n(e is larger and differs in other respects from B. leidicnlaris. 



This species was discovered in eastern Massachusetts by Miss Cora 

 H. Clarke, of Jamaica Plain. 1 am indebted to Miss Clarke not only 

 for this, but for many other species of galls, several of which are 

 new and will be described in this article. 

 2. R. tiiinidiis n. sp. 



Galls.— The.«e rose galls were received from Mr. A. H. Siler, who 

 collected them in southern Utah, but from what species of wild rose I 

 am not able to say. They are globular, and from three-fourths to one 

 and one-fourth inches in diameter, and of the same spongy cellular 

 consistence, internally, as B. radicum O. S. They appear to be enor- 

 mously developed leaf buds, for the terminal half of many of them 

 bears a faint resemblance to a half-opened rose, or a miniature cab- 

 bage, the lines on the surface being the outlines of leaves. They grow 

 on the end of a woody stem, and are in most cases nearly sessile, 



