188 THE entomologist's record. 



miual) ; head siDlitting ; a small lateral slit on the 3rd and 4th (thoracic) . 

 After 20 minntes, the position of the 1st spiracle exjiosed, Imt it is 

 already deeply buried between segments, and hidden, the alimentary 

 lining being drawn out between maxillae. After 24 miwdes, the 

 larval head at wing extremities ; the antennte clear of head, ends 

 still stand up free ; the times of opening and closing of spiracular 

 valves about equal. After 29 minutes, the pupa fi'ees itself from the larval 

 skin ; some fluid visible on last uncovered segments ; sjnracles closing 

 rapidly, the 2nd, Gth and 7th closed. After 32 minutes, the wings reacli 

 the end of the 3rd abdominal segment ; the movement barely visible in 

 spiracle of 4th. In this specimen, the outer spiracular valves (?) 

 closed very soon. The dimensions were now those quoted below, and 

 shrinkage is there reputed. The maxilla3 presented both a downward 

 extension (proboscis), and a lateral one, the latter having two lines 

 across it, as though representing two joints of the maxillary palpus. 



Notes on Hybrid Smerinthus populi=ocellatus {Illustrated by Plate). 



By A. BACOT. 

 {Concluded from p. 8.) 



I forwarded the abdomina of my three specimens of Swerinthna 

 pnpidi-ocellaim to Mr. F. N. Pierce, of Liverpool, who most kindly 

 consented to examine the genitalia, and who, having done so, sent me 

 the following report for insertion in the present paper. Mr. Pierce 

 writes : — 



" Description of genitalia op male Smerinthus populi. — The 

 superior harpes are rounded and full, having an acute angle on the 

 inner margin. The inferior harjics bifurcate at the extremity, the 

 inner hook ))eing elongated, the outer hook short and aln'upt. The 

 uncus is elongated and rounded at the tip. The flap is large, gently 

 tapering to a i)oint. The penis is irregularly curved, surmounted by 

 about 30 or 40 spines (PI. iii., fig. 3). 



"Genitalia of male Smerinthus ocellatus. — The superior harpes 

 broad and rounded, having an acute angle at the inner margin. The 

 inferior harpes sliort and toothed on the inner margin and terminated 

 by a single pointed hook. The outer margin is indented just past the 

 middle, and again nearer the extremity, forming an acute angle. The 

 uncus is a1)ruptly elougated, terminating in a point or beak. The 

 flap is gently pointed, almost forming a right angle, with the ti[) 

 slightly rounded. The i)enis is bulbed, slightly produced at the base, 

 it then ascends almost parallel, having a sharp hook on the lip, and is 

 surmounted with a large number of short, thin spines (PL iii., fig. 2). 



" Genitalia of the jiale hybrids S. populi-ocellatlts. — The 

 superior harpes are narrower, rounded, and have the acute angle on 

 the inner margin. The inferior harpes are long and sinqile, gently 

 tapering into a long thin point, straight on the outer margin. Tlie 

 uncus is abruptly elongated, terminating in a pointed beak. The flap 

 is ])roduced, roundly tapering to a point. The penis is almost bulbed 

 at tile l)ase, })roeecds in a parallel direction, and is surmounted with 

 about 20 small spines bunched together. In point of size there is 

 very little diflerence in the three (PI. iii., fig. 4). 



" Genitalia of male Smerinthus tiuje. — The superior harpes 



