PROTONEURA.—ASHNIDA. 145 
margin slightly shorter than the posterior, the outer margin distinctly convex. Postcubitals, front. 
wings 11-14, hind wings 9-11. 
Dimensions.—Abdomen, ¢ 32, 9 31; hind wing, ¢ 175-18, 2? 19-20 mm. 
Hab. Muxico, Teapa (H. H. Smith: 3 3,3 2). 
Taken in January, February, and March. 
The specific names proposed for the four new species of Protoneura here described 
allude to the absence, presence, or degree of complexity of the mesothoracic processes 
of the females. | 
IT. ANISOPTERA *. 
Front and hind wings dissimilar in shape, the latter generally broader at base; 
usually with a membranule; the quadrilateral of the Zygoptera here modified to form 
a cardinal cell (triangle, discoidal triangle) and a supra-triangle. Males having the 
tergite of the eleventh abdominal segment developed as a single (though often bifid) 
clasping-organ—the so-called inferior abdominal appendage. Nymphs without caudal 
tracheal gills. 
AESHNIDZS. 
Antenodals of the costal and subcostal series not continuous, except the first and one 
other (the latter is variable in position), which two are thicker than their fellows ; 
postnodals in the entire second (median) series ; triangles of the front and hind wings 
usually of similar shape and subequally distant from the arculus in each (except 
in certain Petalurine and some Gomphine). Lateral lobes of the labium two-jointed. 
Synopsis of the Subfamilies found in Mexico and Central America +. 
Abdomen without lateral carine ; head transversely elongated. 
Median labial lobe entire; eyes separated. Females without genital 
valves (i. e. outer gonapophyses of the ninth segment) . . . . 1. GomPHina. 
Median labial lobe bifid; eyes a little separated or meeting in a single 
point dorsally. Females without genital valves . . . . . . 2 CorpuLicasreRin2. 
Abdomen with lateral carine ; head globose, eyes meeting in a line on 
the top of the head. Females with genital valves . - . . . . 3. /MSHNINA, 
* For L., see page 18. 
+ Some of the venational characters given for these subfamilies by Prof. Needham in his work on the 
Aquatic Insects of the Adirondacks (Bull. 47, New York State Museum, p. 434, 1901) apply only to the 
members of the fauna there treated. 
BIOL. CENTR.-AMER., Neuropt., June 1905. u 
