154 THE CANADIAN ENTOMOLOGIST. 



Male imago : Length 8^ mill ; exp. of the wings 12 mill. 



There is before me one specimen from Amballa, E. India, by the same 

 collector, Rev. C. C. Carleton. It did not arrive in the same lot with the 

 female, but several years before in alcohol, together with many other 

 insects. The very large discrepancy in size of the female, and the con- 

 siderably larger size of the male described by McLachlan, though his 

 specimen was dry, together with some differences with the description, 

 seemed to justify my specimen as a new species, perhaps identical with 

 the black one from Calcutta, mentioned without description by Wood- 

 Mason. Nevertheless, some of the differences may be the result of the 

 drying up of the specimen described, and therefore I decided to accept 

 the specimen as a small O. Michaeli till the contrary is proved. It differs 

 as follows from McLachlan's description : 



There is no large, nearly circular, shallow depression on the disc of 

 the head above ; but between the eyes is a short engraved furrow, similar 

 to an aborted ocellus. Antennae brown with paler hairs, instead of black 

 with black hairs ; what remains, 17 joints, is considerably longer than the 

 head and prothorax together; shape of joints as in the description; I do 

 not know if the five apicals were yellow, ; when I figured years ago the 

 details of the specimen, and counted 21 joints, I did not note in the des- 

 cription that the two last joints were yellow. The pronotum is not nearly 

 twice as long as broad ; after the straight front margin and transversal 

 sulcus, there follows a somewhat diamond-shaped elevation, and the base 

 after it is membranous. Legs, wings and veins as in the description ; the 

 only black vein is the subcosta, which, as Wood-Mason justly remarks, is 

 not coalescent with the radius ; all other veins are brown. The wings 

 have indeed five white longitudinal lines, only the first one behind the 

 costa is very narrow. Appendages long, asymmetrical, brown, with long 

 black hairs, the basal joint of the right one long, broad, straight, but by 

 no means nearly quadrate, as in the decriplion ; the left is a little longer, 

 slender, thinner at base, curvated ; the apical joints alike, cylindrical, 

 straight, about as long as the basal joint. The last ventral plate is asym- 

 metrical ; somewhat more to the right originates with a larger base a 

 cylindrical tube, straight, but turned a little to the left ; shortly before its 

 apical opening it is a little constricted ; between it and the right append- 

 ages is a slender process, as long as the tube, cylindrical, its apical half 

 thinner, tip pointed ; on the left side, between tube and appendages, is a 

 process with thicker membranous base, the apical half slender, much 



