ISCHNURA. 123 
3. Inferior appendages bifid or trifid at apex; superiors not bifid, bent 
downward in apical half; a pale green antehumeral stripe; abd. seg. 8 
blue, with a black stripe each side. 
d. Inferior appendages bifid, upper branch(seen in profile) distinctly longer 
than the lower; hind margin of prothorax convex throughout, with a 
small median notch; abd. seg. 9 blue, rarely with black markings . 5. demorsa. 
dd. Inferior appendages trifid or bifid, in the latter case the lower branch 
as long as, or longer than, the upper; hind margin of prothorax 
higher, with the sides straight, convergent, but convex medially, 
no notch; abd. seg. 9 blue, with a black stripe each side . . . . [6. perparva.] 
Females. 
1. Pale colours blue or green; postocular spots not confluent with pale 
colour of rear of head (“ black ” or homceochromatic* females). 
a. Prothorax with no teeth or tooth-like processes. 
b. Larger species (abdomen and hind wings 21 and 135 mm. long 
respectively, or longer); hind margin of prothorax slightly concave 
each side, convex medially ; abd. seg. 8 blue. 
c. Abd. seg. 9 black on dorsum . . wee eee ee ew OL. ramburi. 
ce. Abd. seg. 9 in part at least blue on dorsum wee ww we Pamburi, var. credula. 
bb. Smaller species (abdomen and hind wings 19 and 15 mm. long 
respectively, or shorter) . . . 5. demorsa, [6. perparva| (separable by the shape of 
the hind margin of prothorax as stated above for their males). 
aa. Prothorax with at least a median tooth-like process on the hind lobe. 
d. Middle prothoracic lobe with a small tooth each side; abd. seg. 8 
and 9 blue, with a black stripe each side . . . . . . « 98. denticollis. 
dd. Middle prothoracic lobe without teeth ; an inwardly-curved pencil 
of hairs on each side of the median tooth of the hind lobe; abd. 
seg. 8 blue,9 black . . . - . s+ - . to . [4 cervula.] 
2. Pale colours orange or olive ; postocular spots confluent with pale colour 
of rear of head (“ orange,” “ olive,’”’ or heterochromatic females). 
e. Prothorax without teeth or tooth-like processes. 
f. Larger species (see dimensions for black females above): no black 
humeral stripe or line, orange (or olive) on abdominal dorsum 
confined to segment ] and partof2 ... . wo. 2 ©) 1. ramburi. 
ff. Smaller species (see dimensions for black females above) : a black 
humeral stripe or line, orange present on large parts of abd. seg. 
1-8, often also on 4.and 8-10 . 5. demorsa, [6. perparva] (separable by the shape of 
the hind margin of prothorax as stated above for their males). 
ee. Prothorax with at least a median tooth-like process on the hind lobe. 
g. Middle prothoracic lobe with a small tooth each side; abd. seg. 8 
and 9 blue on dorsum, a black stripe each side (young) or entirely 
black (old) ; no orange on abdominal dorsum... . . . . 38.; denticollis. 
* Homcochromatic, similar in colouring to their respective males. 
r2 
