106 THE CANADIAN ENTOMOLOGIST. 



yellow, femora and the tibiae at base brownish. Wings hyaline, pubes- 

 cent and ciliated, the pubescence brown, the venation as in Tetrastichus. 



Hab. — Florida. 



Described from one specimen. 



(17) Aprostocetus canadensis n. sp. 



%. Length to tip of ovipositor .08 inch; ovipositor .02 inch. Dark 

 blue, with a slight aeneous tinge on the thorax. Head emarginated in 

 front, and very thin antero-posteriorly. Eyes brown. Antennas shorty 

 eight-jointed, brown, pilose. Collar short, transverse, rounded before ; 

 mesothorax with distinct, deep parapsidal grooves and a median groove. 

 Abomen linear not quite twice as long as the thorax, concave above, 

 keeled below, the ovipositor being not quite two-thirds as long as the 

 abdomen. Legs honey-yellow, the femora, excepting at tips, blue ; the 

 tibiae with a brown blotch in the middle, more distinct on the posterior 

 pair ; apical tarsal joints brownish. Wings hyaline, almost devoid of 

 pubescence ; the venation as in the genus Tetrastic/ius. 



Hab. — Canada. 



Described from two specimens sent me by Mr. W. Hague Harrington, 

 who reared them from the thistle (?) cecidomyia, along with Solcnottis 

 Fletchcri, on which it may be a secondary parasite and from which it is 

 with difficulty distinguLed. Solenotus, however, has a larger collar and 

 very broad, thick fore femora and tibiae. 



(18) Aprostocetus americanus n. sp. 



°_ . Length to tip of ovipositor .09 inch ; length of ovipositor alone 

 .03 inch. Smooth, shining black Head emarginated in front and very 

 thin antero-posteriorly. Antennae eight-jointed, brown, the club wider 

 than the funicle joints. Thorax : collar very short, transverse ; parapsidal 

 grooves deep, distinct and no median groove on the mesonotum. Scu- 

 tellum convex, slightly longer than wide, with two parallel grooves on the 

 disk. Abdomen sessile, long, linear, without the ovipositor about twice 

 as long as the head and thorax together, very slightly widened just before 

 apex and from thence acuminate and ending in a long ovipositor two- 

 thirds its length, above depressed, below keeled with a few long hairs 

 surrounding apex. Legs honey-yellow, the femora, excepting at tips, 

 brown, the terminal joints of anterior and middle tarsi and the two 



