NEW DRAGON-FLY NYMPHS— NEEDH AM. 



717 



ACANTHAGRION CHELIFERUM Selys. 



This species was reared at Sao Paulo, Brazil, September 2(1, 1S1>7. 

 hy Mr. Adolph Ilenipel. The following description is diawn from a 

 single cast skin, lacking gills and otherwise somewhat mutilated; the 

 skin Avas accompanied b}- the teneral male imago that had emerged from 

 it, and in the same sending were other maturer specimens of the same 

 species, serving to render certain the identification of it by direct 

 comparison. No nymphs of the genus being known, it is tliought 

 worth while to describe those characters that are shown by the present 

 specimens, more especial]}- because the most important of these are in 

 the labium, which is well preserved. 



The nymph measures in total length of body (gills wanting) al)out 

 13 mm.; abdomen, 7.5 mm.; hind femur, 3 mm. 



Body and head of the same form and proportions as in Knalhigma 

 and LsclDiura. Antenna3 longer than the head, the ratio of length 

 of segments from the base outward being: 1 : 1.5 : 2.2 : 2.2 : 2 : 1.7 : 1. 

 Labium (Plate XLIII, hg. 11) moderate, mentum regularly widened to 

 the base of the lateral lobes, just before each of which is a row oblique 

 of minute spinules near the lateral margin; one mental seta each side. 

 Lateral seta? 7, strong; movable and end hooks l)oth well developed, 

 the end of the lateral lobe (Plate XLllI, lig. 12) between these hooks, 

 thin and rather evenly denticula? on its revolute margin, the outer 

 angle well rounded. 



Legs slender, scantily armed with minute spinules. Wing cases 

 reaching posteriori}^ as far as the apex of the third abdominal segment. 



HESPERAGRION HETERODOXUM Selys. 



This exquisite damsel tly was bred for me ])y ^Ir. Frank (.'. Willard 

 in the Huachuca Mountains near Tombstone. Arizona, in the latter 

 part of July, 1897. The altitude 

 was near 7,500 feet. The situa- 

 tion was a deep reservoir of cold 

 water, formed by damming a 

 stream that flowed through a 

 narrow canyon. The imagos of 

 the species '' spent most of their 

 time among the joint-grass that 

 grew in the edge of the water." 



The nymph measures 15 nnn.; 

 gills, 1.5 mm. additional; hind 

 femur, 2.5 mm.; width of head. 

 2.5 mm.; of abdomen, 2 nmi. 



Body elongate, slender, grad- 

 ually tapering posteriorly. Head wide, with eyes laterally very 

 prominent, and the sides broadly rounded behind the eyes to the 



1.-IG. 9.— LABUM or NYMI'II OF HESPERAGRION 

 HETKRoDOXfM.THF. I.ATEHAI. I.oBEOK TUESAME, 

 MOKi; KNLAK<iEI>. 



