174 NEUROPTERA. 
sides of the thorax. ‘The transverse, submedian, yellow, abdominal rings are interrupted mid-dorsally on 
segments 2-9 in some, in others they may not be interrupted on one or all of 2, 8, and 9. 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith: 1 6,1 2); GUATEMALA, Purula 
in Vera Paz (Champion: 1 3); Costa Rica, Irazu *? (Rogers: 1 s,1 ¢, each with 
label “ Cordulegaster godmani, McL..,” in McLachlan’s handwriting, and a printed 
label “ Type”), Azahar de Cartago (Underwood: 1 ¢ ). 
Taken at Omilteme in July, at Azahar de Cartago in May. 
Subfam. “SHNINA. 
Synopsis of the Genera of the present Faunal District. 
A. Upper piece of the arculus shorter than the lower piece, upper sector of the 
arculus arising close to the median vein (about midway between the latter 
and the lower sector) ; supplementary sector between the median and sub- 
nodal sectors curved away from the latter, so that three to seven rows of 
cells lie between them, but subsequently converging ; subnodal sector with 
four to seven branches, the terminal fork with two rows of cells between ; 
two rows of cells between the principal and nodal sectors beginning far 
distal to the pterostigma ; proximal side of the discoidal triangle less than 
half as long as the distal side ; external branch of the lower sector of the 
triangle on the hind wings gradually approaching the upper sector for its 
apical half, becoming parallel to it and finally separated from it by one row 
of cells; abdominal segments 7-10 at least with a supplementary lateral 
longitudinal carina above the usual one. Males with no anal triangle, anal 
angle rounded off; no auricles on abdominal segment 2. . . . . . . ANAX. 
AA. Upper piece of the arculus equal to or longer than the lower piece, upper 
sector of the arculus arising at, or a short distance above, the point of 
origin of the lower sector (in the latter case being separated from the lower 
sector by a distance one-fifth to one-half of the interval separating the 
upper sector from the median vein). Males with anal triangle and anal 
angle on the hind wings and auricles on abdominal segment 2. 
B. Supplementary sector next below the subnodal sector diverging therefrom, 
with three to seven rows of cells between them, subsequently converging. 
C. Subnodal sector forked or branched. 
D. Subcosta prolonged beyond the nodus to the first, second, or third 
postnodal; median space* free, no basal subcostal cross-veins, tip 
of vertex excavated . 2. 2. 1... Loe ee STAUROPHLEBIS. 
DD. Subcosta not prolonged beyond the nodus, median space free. 
E. Eyes in contact for a distance equal to or less than the antero- 
posterior dimension of frons and vertex combined ; membranule of 
* "Tn the use of the terms “median space,” “ submedian space,” &c., I have followed de Selys’s later sugges- 
tions in Ann. Soc. Ent. Belg. xl. p. 385 (1896). See Proc. Calif. Acad. Sci. (3), Zool. i. p. 388, footnote (1599). 
