ENALLAGMA 337 
blue and black in older specimens). Male. Face pale. Postclypeus black with 
pale margins. Pale transverse frontal band wide, reaching the basis of the an- 
tennae. Vertex, antennae and remainder of frons entirely black. Pale postocular 
spots, large, cuneiform and isolated. The pale postocellar stripe wide and well 
developed, but separated from the postocular spots. Anterior and posterior lobes 
of the prothorax predominantly yellow, merely edged with black. Middle lobe 
mainly black, with the sides and two very large lateral spots, pale. Middorsal 
carina pale. Middorsal black stripe wide. Pale antehumeral stripe much wider 
than the dark humeral, which latter is extremely irregular. Small black basal 
spot on the third lateral suture, none on the second lateral suture. Abdomen pale, 
black as follows: a small basal spot on 1; an apical spot and ring on 2; apical 
fourth of 3-4; apical two-thirds of 5-6; four-fifths of 7; all the dorsum of 10. 
8-9 entirely pale. 
Superior abdominal appendages about as long as 10, bifid, the lower basal 
branch short and flap like, the upper branch slender and turned up slightly at 
the tip. In an interio-dorsal view there is a distinct heavy spine at the base of 
the superiors and a small tubercle just before it. Culicinorum is related to the 
anna-praevarum group, but in profile view the appendages superficially resemble 
those of coecum and traviatum. 
The female is unknown. 
335. Enallagma praevarum Hagen 
Hag. ’61, p. 88: Mtk. Cat. p. 61: Ndm. ’23, p. 181: Smn. ’27, p. 15. 
Length 31 mm. Expanse 40 mm. Kan. and La. west to Calif. 
Male. Colors yellow or blue, and black. Head beléw pale. Postclypeus 
black. Pale transverse frontal band narrow, not reaching to the basis of the 
antennae. Vertex, antennae and remainder of the frons, black. Postocular spots 
large and triangular, narrowly joined to the pale postocellar stripe, or separated 
from it, sometimes also joined with the pale color of the rear of the head. Pro- 
iy Trl vie 
culicinum praevarum anna eisent 

thorax black with a median spot on the anterior lobe, the sides and a pair of 
large lateral spots on the median lobe, and the posterior margin of the hind lobe, 
pale. Thorax with the middorsal carina pale; a wide middorsal black stripe 
and pale antehumeral stripe, both of which are wider than the irregular dark 
humeral stripe. A short black basal spot on the third lateral suture. Abdomen 
pale, black as follows: a basal spot on 1; an apical spot and ring on 2; apical half 
to third of 3; three-fourths of 4; nearly all of 5-7, except rather wide basal bands 
on 5-6, and a very narrow one on 7; all the dorsum of 10. 8-9 entirely pale. 
Superior appendages bifid, shorter than 10, usually with a small internal tubercle. 
The female is similar to the male. Abdomen with the dorsum of 2-10 black 
as in EL. anna, black of 1 not reaching the apex of the segment. 
