194 THE CANADIAN ENTOMOLOGIST. 



former has been reared from a Lecanium on peach by Tschek, from a 

 Lecanium on plum by Kollar and Rogenhofer, and from coccids on grass 

 by Kollar and Kriechbaumer ; while the latter has been reared by Kriech- 

 baumer from coccids on plum and grass. 



" I have, with Dr. Riley's kind permission, dedicated this remarkable 

 and beautiful genus to him, in acknowledgement of the work which he has 

 done in making known the life-histories of American hymenopterous 

 parasites, not less than in acknowledgement of the opportunities he has 

 given me, and the assistance and encouragement he has rendered me in 

 the study of the interesting family to which it belongs. 



" Riley a, Gen. nov. Female. Moderately stout, resembling somewhat 

 Cerapterocerus Westwood (see Mag. Nat. Hist, vi., 1833, page 495 ; 

 see also Snellen van Vollenhoven, Schetsen, Tab. vii ; see also Mayr, 

 Die Europaischen Encyrtiden, Verh. d. k. k. Zool. Bot. Ges. Wien, 1875, 

 page 747 ; see also Ratzeburg, Ichn. d. Forstins. ii., 1848, page 152, 

 under name Tekgraphus), but differing as follows : The face is not 

 elbowed in the middle so as to give a triangular profile to the head, but is 

 gently rounded, and has a strong glistening transverse clean-cut ridge just 

 above the insertion of the antennae, which are stouter and with a more 

 concave scape than with Cerapterocerus. The mesoscutellum has a strong 

 tuft of erect black hairs as in Cliiloneurus, but which is lacking in Cerap- 

 terocerus. The stigmal vein is given off immediately at the juncture of 

 the submarginal with the costa, and is a trifle longer than the postmarginal. 

 The submarginal is three and one-half times as long as the stigmal. The 

 postmarginal, the distal third of the submarginal, and the wing disc below 

 this last heavily clothed with short stout bristles. The body is highly 

 polished and the wings are not hyaline. The metanotal spiracles are large, 

 long-oval and oblique, and the abdominal spiracles are very prominently 

 tufted. The ovipositor does not protrude, except in specimens killed in 

 the act of oviposition. 



" Riley a splendens, Sp. nov. Female. Length, 1.63 mm.; expanse, 3.8 

 mm.; greatest width of fore- wing, 0.53 mm. Front with a delicate round- 

 oval punctation ; cheeks with delicate longitudinal striation, and a perfectly 

 smooth band bordering the eyes ; mesoscutum very delicately shaggreened ; 

 scutellum and scapulas smooth ; mesopleura and abdomen smooth. 

 General color metallic green, the most brilliant reflections given off from 

 the cheeks and the proepimera ; antennae also with metallic reflections, 



