﻿34 THE ENTOMOLOGIST. 



Table II. — Miceogenes of Oporabia dilutata. 



0. dilutata dilutata. 0. dilutata christyi. \0 .dilutata fraxinaria. 



Description 



Hatches 



Glossy,ruby in colour, A little smaller,* glos- Slightly smaller 

 pitting feeble sier 



Varies 



The same 



Earlier 



Description , 

 Food 



Green, often purple- 

 marked 



Oak, &c. 



The same 



Birch, &c. 



Always green 

 Nearly always ash 



Emerges 



Markings, 

 size, &c. 



'Middle of October & 

 ! onward 



The same 



Sept. 30th-Oct. 20th 



Ground very variable. Ground whitish gene- Much smaller, ground 

 Discal point large ; rally. Discal point bluish-grey, glossier 



angle of elbowed line small ; angle of 

 rounded ; sweepsi elbowed line almost 



near discal point 



as near a right-angle 

 in autumnata 



Practically no mark 

 ings ; parallel to 

 autumnata pinivo 

 raria. Is not, how 

 ever, melanic 



Octavals 

 Labides 

 Valves . . 



Far apart 

 Head narrow 

 Spined externally 



Very near 

 Head wide 



As in christyi 

 Intermediate 



Shorter; spine more, Much as in dilutata 

 hooked I dilutata, but smaller 



Explanation of Plate of Genitalia. — I. autumnata ; II. dilutata ; 

 III. hybrid robsoni ; IV. hybrid rungei. A. Valve ; B. Head of labides ; 

 C. Juxta and Cristas ; D. Bursa copulatrix with signa and Ductus seminalis : 

 E. Upper sigDum ; F. Lower signum. 



NEW SPECIES OF HETEROCERA FROM FORMOSA. 

 By a. E. Wileman, F.E.S. 



NocTuiD.a;. 

 Micreremites hid&ntata, sp. n. 

 ^ . Fore wings whitish, with a faint ochreous tinge ; antemedial line 

 black, sinuous, a black line from it to base of the costa ; postmedial 

 line black, sinuous, the sinus enclosing black discoidal spot biden- 

 tate ; subterminal line pale, sinuous, inwardly bordered with black, 

 area beyond the line suffused with blackish ; terminal line black, 

 lunulate ; fringes grey, white at base. Hind wings whitish, fuscous 



* Comparisons with 0. dilutata dilutata. 



