24 Records of the Indian Museum. ~ [ Vol, Sen 
P. microcephalum is evidently one of the commonest of 
dragonflies in the low-lying parts of Bengal. 
Approximate dimensions : 
@¢ abdomen 27-29 mm., hind-wing 17-18 mm. 
2 27-28 mm., o 18-I9g mm. 
93 
P. decorum (Ramb.). 
P. decorum, Kirby, Cat. Odonata, p. 153; Kruger, Stettin Ent., Zett., 1808, 
p- 119; Morton, Trans. Ent. Soc. London, 1907, p. 307, pl. xxiv, figs. 
Vepoks 
2¢ fo Calcutta, 4-1-15 (#322). 
1¢ Calcutta (£391). Labelled by de Selys. 
1g Sar Lake, Puri District, Orissa, g-iv-15 (4). 

Range :—Peninsular India, Sumatra. 
Recorded Stations:—Bombay ‘:Rambur), Deesa (Morton), 
Soekranda, Sumatra (Kruger). 
The adult male closely resembles the newly-emerged male of 
the closely allied P. microcephalum in colour, so far as the thora- 
cic pattern is concerned. 
Approximate dimensions : 
@ abdomen 28-30 mm., hind-wing Ig mm. 
2 ns 25-27 mm., $3 18 mm. 
P. rubriceps, Selys. 
P. rubriceps, iirly, Cat. Odonata, p. 183: Selys, Ann, Mus. Genova, (2) X, 
p. 83 (1891). 
1g immature, with larval skin. Museum Tank, Calcutta ($97). 
Range -—India, Burma, Java. 
Recorded Stations :—Palon (Selys), ‘‘ India’’ (Selys), “‘ Java’’ 
(Selys). 
The specimen was preserved shortly after emerging, conse- 
quently it is not possible to make any examination of the wing 
characters. 
Fortunately the anal appendages are well shown. The 
colouring of the thorax resembles closely that of an immatvre 
P. decorum. In general the insect both 
as regards colour and the structure of the 
anal appendages is a typical Pseudagrion. 
Segments 9-10 of the abdomen are (appa- 
rently) blue; 8 would appear to have a 
longitudinal bronze band dorsally, narrow- 
ing in front. The upper pair of anal 
appendages are tinged with brown, the 
#1G. 2—Apex of abdo- lower pair are white. The curious series 
bina re SR hae of spines developed along the border of the 
; excavation of segment 10 are black (see 
text-fiz 2). 
Selys’ accounts of the colouring of the abdomen are contra- 
dictory. In the synopsis he states that segment 10 is black 

