ENALLAGMA 339 
338. Enallagma basidens Calvert 
Calv. ’02, p. 114: Mtk. Cat. p. 55. 
Length 24 mm. Expanse 28 mm. Southwest into Tex. 
This blue and black damselfly has its home primarily in the state of Texas, 
but is probably to be found all along the Mexican-United States border. Mouth 
parts, genae, first joint of the antennae, and the frontal transverse band above 
the postclypeus, pale blue or buff. Remainder of frons and vertex black. Pale 
postocular spots narrow, serrated and connected with each other by way of the 
pale postocellar stripe, separated by black from the pale color of the rear of the 
head. Prothorax black, with the following blue: anterior half of anterior lobe, 
a median round spot, two lateral crescent shaped spots, and the sides of the 
median lobe, and a narrow line on the posterior margin of the hind lobe. Mid- 
dorsal carina of the thorax blue, thus splitting the black middorsal stripe. Pale 
antehumeral stripe narrow. Black humeral stripe split longitudinally by a fine 
blue line, the upper part of the humeral being connected with the middorsal 
stripe by a black bar along the upper margin of the thorax. Sides of thorax blue. 
Vein Mz arises nearest the 4th postnodal cross vein in the fore wings, the 3rd in 
the hind. Abdomen blue with the following black: dorsum of 1-3 for their entire 
length, the black being wider at the base and before the apex on 2, on 3 having a 
hastate form which widens greatly in the apical sixth; a hastate spot on 4-6, 
occupying the apical half to three-fourths on 4, half to three-fifths on 5, and 6; 
almost all the dorsum of 7; dorsum of 10. Superior appendages about three- 
fourths as long as 10, black, bifid, upper arm heavy and broad, the lower appear- 
ing as a basal spine-like projection from the upper. No tubercle. 
The female is similar to the male, the blue of the male, however, is replaced 
by yellow or pale green in the female. In the abdomen segments 4-6 are like 3 
of the male, 7 is like the male, 8 with a middorsal black band for its entire 
length, 9 with a pair of dorsal black spots on the basal half, remainder of 9 and 
all of 10 blue. Hind margin of the prothorax entire, convex and somewhat 
flattened dorsally (as it is also in the male). 
339. Enallagma aspersum Hagen 
Hag. ’61, p. 97: Mtk. Cat. p. 55: Garm. 717, p. 524 and ’27, p. 84. 
Length 27-34 mm. Expanse 36-44mm. N.E.,N.Y.and N.C. to Mo. and Wis. 
This blue and black damselfly is not a common species, but is found about 
small ponds, often temporary ones. The mouth parts of the male are buff. Post- 
Je ip iy 
basidens aspersum semicirculare 

traviatum 

clypeus black with the usual pale transverse frontal band above. Remainder of 
frons, the vertex and antennae black. Pale postocular spots connected with the 
pale of the rear of the head but separated from each other. Prothorax mainly 
