ISCHNURA 353 
ocular spots usually very small and widely separated from the pale postocellar 
stripe, occasionally large and narrowly connected with it. The anterior half 
of the anterior lobe, the sides of the middle lobe, and the posterior lobe of the 
prothorax, pale. Dorsum of the middle lobe entirely black, or with a small pale 
spot on each side. Thorax with a wide pale antehumeral stripe. Sides pale except 
for a basal black line on the third lateral suture reaching as far as the basis of 
the posterior legs, and a small black spot on the base of the second lateral suture. 
Abdominal segment 1 pale with a basal black spot on the dorsum; segments 2-7 
with dorsum entirely black except pale narrow interrupted basal rings on seg- 
ments 3-6, and preapical rings on segments 3-5. Segments 8~9 entirely blue ex- 
cept for a very fine transverse black line covering the preapical teeth. Segment 
10 entirely black on the dorsum, with the forked elevation well developed. 
Female. Heterochromatic. Differs from the male as follows: Pale areas of 
the head very much larger, the transverse frontal band of yellow nearly reaching 
the median ocellus, the pale postocular spots wide and broadly joined to the 
yellow of the rear of the head. The dark middorsal and humeral thoracic stripes 
very narrow. Abdominal segments 8-9 broadly brown on the dorsum. A well 
developed ventral spine on the apical margin of segment 8 of the abdomen. Hind 
margin of the prothorax convex throughout, no teeth nor tooth like processes. 
353. Ischnura utahensis Muttkowski 
Mtk. ’10, p. 9. 
Length 33 mm. Expanse 36 mm. Utah 
Coloration the same as in Ischnura barbert. The differences between the two 
species are to be found in the superior and inferior abdominal appendages as 
described in the key. Possibly, a synonym of J. barberi. 
The female is unknown. 
354. Ischnura credula Hagen 
Hag. ’61, p. 80: Mtk. Cat. p. 70: Calv. ’28, p. 11. 
Syn: defixa Hag. 
Length 29 mm. Expanse 32 mm. Fla. and Calif, 
This damselfly is commonly considered as a subspecies of Ischnura ramburii. 
It differs little from it except in the coloration of the 9th abdominal segment of 
the male. In ramburii this segment is entirely black on the dorsum, while in 
credula it is blue with wide irregular basal and apical transverse bands of black. 
355. Ischnura perparva Selys 
Selys ’76, p. 263: Mtk. Cat. p. 69: Kndy. ’15, p. 310. 
Syn: defiza 
Length 24 mm. Expanse 27 mm. B.C., Mont. to Calif. and Tex. 
Head greenish below, black above. The mouth parts, genae, postgenae, ante- 
clypeus and the vertical portion of the frons, pale. The labrum green with a 
black basal stripe. The postclypeus, the horizontal portion of the frons, the 
antennae, the vertex and the occiput, black. Pale postocular spots small and 
isolated. Prothorax black with a transverse stripe on the anterior lobe, a pair of 
