716 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



Fig. ".—Caudal gill lamella of 



NYMPH OP TELAGRION D^CKII, FROM 

 THE SIDE. 



Body very slender, with long cylindric abdomen. Head depressed, 

 with eyes very large and laterally very prominent, the sides of the 

 head sloping behind the eyes to the obtuse and scurfy pubescent hind 

 angles between which is a deep notch on the hind margin. The three 

 basal segments of the antenna (which only are preserved) are in rela- 

 tive length from the base outward as 1:1.5:3. The labium (Plate 

 XLIII, tig.l3) is long and slender, with the hinge reaching posteriorly 

 as far as the mesothorax. The median lobe is rather obtusely promi- 

 nent; there are three mental set^e each 

 side, decreasing in length toward the 

 median line. There are six. strong lat- 

 eral seta?, and the end hook is rather 

 short and stout. The inner margin of 

 the lateral lobe is rather strongly convex 

 and terminates in a stout and arcuate end 

 hook, al)ove which on the end is a row 

 of four teeth in a straight row, diminish- 

 ing in size externally, the outer angle being nearly a right angle. 



The legs are slender and not very long; each femur shows a faint 

 subapical brown ring. Wings reaching the base of the fourth abdom- 

 inal segment. Thorax rather small. 



Abdomen long, slender, cylindric; segments 2-8 of equal length, 

 the ninth a little shorter, and the tenth half as long as the eighth. 

 Gills (fig. 7) almost half as long as the abdomen, narrowly oblong, 

 widest just beyond the middle and abruptly narrowed to submucro- 

 nate tips, the basal half of both margins of each gill thickened and 

 spinous, but not jointed where the thinner margin begins. 



TELEBASIS SALVA Hagen. 



Bred specimens from Mr. F. G. Schaupp collected at Shovel 

 Mount, Texas. 



Length, 11 mm., including gills, 3.3 mm.; abdomen, G mm.; width 

 of head, 3.5 mm. 



Head depressed, much wider than succeeding parts of the body, 

 with large laterally prominent eyes, low hind angles, a sharp notch 

 between them on the hind margin. Antenna? 

 much shorter than the head is wide. Labium 

 short, hinge hardly reaching the mesothorax. 



Legs moderate, scantily spinulose. Wing- 

 cases reaching the middle of the fourth abdom- 

 inal segment. Abdominal segments of about 



equal length, cylindric; the tenth a little shorter than the others, 

 especial!}^ on the dorsal side. Gills (tig. 8) oblanceolate, widest at 

 three-fourths their length, and suddenl}^ narrowed to an obtusel}' 

 rounded apex, their margins smooth, marked with a few distant faint 

 brown spots, and trachefe more or less pigmented. 



Fig. 8.— Middle gill lamella 

 of nymph of telebasis 



SALVA. 



