144 ENTOMOLOGICAL SOCIETY 



I 



O. epytus Wlk. I can see very little difference between the 

 descriptions of this and the following species. This descrip 

 tion was probably drawn from a small specimen of euchenor, 

 and I should regard it as a synonym of that species, the de 

 scription of which is better applicable to most of the speci 

 mens. 



O. euchenor Wlk. I identify one $ from this vicinity, one 

 $ from Iowa, two $ $ from Minnesota (?), and two $ $ and 

 three 9 from southern Illinois (Robertson), with this 

 species. 



O. liturata Olivier. I fail to identify this species in my 

 material. It is, without much doubt, an Ocyptera, though the 

 description of some of the parts, especially the wings, is won 

 derfully like Trichopoda. 



O. dotadas Wlk. The description says that the abdomen is 

 linear, which doubtless here means slender. The only differ 

 ences I can perceive between the descriptions of this species 

 and dosiades are that in this the median black abdominal vitta 

 seems to be obsolete, the wings are longer, and the balancers 

 are black instead of taw r ny. If I have put the right con 

 struction, upon these points, the species is no doubt valid. 

 The descriptions are exactly alike in all other particulars. 



O. binotata Bigot, Ann. Soc. Ent. Fr., 1878, 44. This ap 

 pears to be the same as euchenor Wlk. It is a much larger 

 species (10 mm.) than dosiades Wlk. 



Ocyptera argentea nov. sp. 



Male Black, silvery pollinose. Byes dark brown ; front nearly or 

 quite one-third the width of the head, not nearly so broad as the face ; 

 vitta black, of equal width, with a row of black bristles on each side ; 

 sides of front borders of the eyes and face silvery-white pollinose, gray 

 ish in some lights ; antennae black, third joint only a little longer than 

 the second ; proboscis black ; palpi undeveloped ; cheeks and occiput 

 gray hairy, silvery-white pollinose ; a pair of long black bristles on the 

 vertex, one on each side of the ocelli. Thorax black, with a silvery re 

 flection, covered with black macrochetse ; shoulders and pleurae silvery 

 pollinose, also three* longitudinal, abbreviated silvery vittae on the mid 

 dle of the front portion of the thorax ; scutellum black, with a faintly 

 silvery reflection, four-sided, narrower posteriorly, with black macro- 

 chetae on its sides and behind. Abdomen black, shining, with lateral 

 and dorsal pairs of black macrochetae always near the hind margin of 

 the segments ; second segment and front half of third obscurely red on 

 the sides, the red often hardly perceptible from above ; forward half of 

 third and fourth segments broadly silvery-white pollinose on the sides ; 

 venter black, second segment and a part of third red. Legs black, coxae 

 and the hind surface of the front femora silvery-pollinose, femora and 



