108. NEUROPTERA. 
DD. Hind margin of prothorax convex medially, slightly concave or 
truncated on each side; superior appendages with a distinct 
ventrally directed process or lamina in their basal half. 
E. This process directed backward as well as ventralward and 
rounded at the tip; inferior appendages from two-thirds to 
nearly as long as the superiors; abd. seg. 5 predominantly | 
black. 2. 0. 6 ee ee ee ee ew ee A prevarum. 
EE. This process not directed backward, broadly truncated at the 
tip, and usually partly concealed by the tenth segment; - 
inferior appendages one-fifth (or less) as long as the superiors. 5. semicirculare. 
CC. Black markings on abd. seg. 2 U-shaped, pale colour on 3 violet ; 
superior appendages widely bifid in profile view, upper branch 
longer. 2 ww ee ee eee ee ee ee we 6, CCUM. 
BB. Third abdominal segment blue with a lanceolate black spot on the 
basal half and a broader black band on the apical fourth; superior 
appendages with a triangular ventral process in their basal half. . [7. eiseni.] 
Females. 
1. Hind margin of the prothorax convex throughout. 
A. Black on dorsum of abd. seg. 1 not reaching the apex. 
B. Abd. seg. 8 entirely blue, or with black on dorsum narrower 
anteriorly than posteriorly ; 9 black on dorsum . . . [l. cyathigerum], [2. calverti 
(apparently not distinguishable). | 
BB. Abd. seg. 8 blue, apical fourth and the sides inferiorly black and 
confluent ; 9 black with a pair of apical blue spots . . . . . 6. c@cum, 
AA. Black on dorsum of abd. seg. 1 reaching to the apex of the segment ; 
dorsum of 8 and 9 black, of approximately equal width throughout . 3. civile. 
2. Hind margin of the prothorax convex medially, slightly concave or 
truncated on each side; black on dorsum of abd. seg. 1 not usually 
reaching to the apex, dorsum of 8 and 9 black, which is narrower 
anteriorly on 8 and posteriorly on 9. . . . . «© 2 « + + « « 4 prevarum. 
§ II. Nodal sector arising near the fourth postcubital (or even nearer to the 
base) on the front wings, nearest the third on the hind wings, which 
latter have 5 or 6 postcubitals. 2. 2 2. 1. 1 we we ee ee) [8 basidens.] 
The females of E. semicirculare and E. eisent are unknown. The identification 
of females of Enallagma is notoriously difficult. The characters given above under 4 I. 
for their separation are based on individuals taken in coitu, but some intermediate 
females also exist which I cannot identify. 
[1. Knallagma cyathigerum. 
Agrion cyathigerum, Charpentier, Lib, Eur. p. 163, t. 42. fig. 1 (entire insects, ¢ ?) (1840) ’° ; 
Selys, Rev. Odon. Eur. p. 205, t. 10. fig. 2 (apps. ¢) (1850) *; Tiimpel, Geradfl. Mitteleur. 
p. 59, t. 2 (entire insects, § 9) (1900) *. 
