294 THE CANADIAN ENTOMOLOGIST. 



wild crab or cultivated apples in Orono, Maine, while engaged in 

 special work for this Station. 



Specimens of the Cherryfield parasites were submitted to Mr. 

 E. A. Richmond, of Cornell University, who determined it as a 

 new species. The following description, which he has given me 

 permission to publish, should be credited to him, as well as the 

 synonymy of the genus, which follows: 



Biosteres rhagoletis, sp.n. (Plate XII.) 



"Fulvous (xanthine orange); antennae, except scape in d^ 

 (partly in 9), terminal joints of pro- and mesothoracic tarsi, en- 

 tire metathoracic tarsi and tips of mandibles, brown; eyes and 

 ocelli black; wings with membrane colourless, nervures and stigma 

 brown; sheath of ovipositor brown; inner stylets fulvous. Length 

 3 mm.; ovipositor 3 mm. Habitat — Cherryfield, Maine. 



"Head shining, closely tessellate, punctulate, pilose (including 

 mouth-parts); ocellar elevation impunctate and not pilcse; face 

 with a median longitudinal elevation, almost a keel: clypeiis with 

 sparser punctures in centre; flagellum 36-41-jointed; scape a little 

 longer than first joint of flagellum, pedicellum globular. Thorax 

 shining, sparsely punctulate and pilose ;parapsidal furrows converg- 

 ing and ending in a median V-shaped, impunctate impression, 

 which lies in the posterior third of the mesonotum; mesonotum 

 (including scutellum) margined; propodeum not flat but rounded, 

 more pilose and punctulate than the rest of thorax, irregularly 

 rugulose and tending to have poorly-defined areoles, which are 

 more especially prominent in 9 9 ; r (first abscissa of the radius), 

 a little more than Ve as long as r-m; shorter than the petiole of 

 M4; M4 petiolate, petiole about ^/s as long as m-cu. Abdomen 

 finely punctulate, shining, very sparsely pilose; 1st segment mar- 

 gined laterally, finely and closely striated with some of the eleva- 

 tions often more prominent at basal half; 2nd segment with a little 

 more than its basal half finely and closely striated, except at sides; 

 d^ and 9 similar, except as noted above. 



"Cotypes deposited in collections of the Maine Agricultural 

 Experimental Station, Orono, Maine; Cornell University, Ithaca, 

 N. Y., and in the private collection of E. A. Richmond, Ithaca, 



