148 ENTOMOLOGICAL NEWS [April, 'll 



Legs not remarkably long, but slender. Wing cases reaching the 

 fourth abdominal segment. Abdomen long, cylindric. Gills long, 

 straight, slowly tapering and then suddenly enlarged just before the 

 tips, after which they are abruptly narrowed to the end, the lateral 

 ones triquetral, the median flat, with a carina each side, arc! one-third 

 shorter than the laterals. 



Calopteryx angustipennis (supposition). (Plate IV, figs. 5-8.; 



A single immature female specimen, M. C. Z., No. 307, 

 "Green River, near Mammoth Cave, Ky., 4-ii-'74, Putnam." 



Length 20 mm., lateral gills 12 mm. additional, the median gill 9 

 mm., abdomen 13 mm., antenna 8 mm., of which the basal segment 

 measures 5 mm., hind femur 8 mm., width of head 3 mm., of abdomen 

 2 mm. 



Body very long and slender. Head about as long as wide, depressed 

 and very flat above, with a prominent, angulately elevated and an- 

 teriorly directed tubercle behind each eye. Eyes small and situated 

 at the midlateral margin of the head, and laterally prominent. An- 

 tennae very long, the basal segment densely pubescent and longer than 

 the head is wide, the second segment one fourth as long as the first 

 and the third to the seventh successively shorter and more slender. 

 Labium very long and slender, the hinge reaching posteriorly to the 

 metathorax; mentum with sides parallel in basal half, deeply and widely 

 cleft in the greatly widened apical half into two slender lobes; these 

 lobes are apposed at apex making an oval inclosure of the cleft; a pair 

 of spinules, one each side, arise from the inner edges of the cleft at 

 three-fourths its length. The lateral lobes are slender, with nearly 

 parallel sides, the inner margin slightly convex and finely and doubly 

 serrate, ending in a short arcuate end hook, that is separated by a deep 

 cleft from two other larger similarly shaped hooks upon the end ; above 

 these hooks there is on the external margin the usual movable hook, 

 which is larger and stouter and regularly arcuate :• there is a pair of 

 spinules on the lateral margin just before the base of the movable 

 hook. 



Legs very long and slender, each femur with a flattened prominence 

 at the end upon its anterior face, that rests against the side of the 

 tibia at its base, and is doubtless for leverage in these long legs. 

 Wing cases reaching the middle of^the 3d abdominal segment (young) . 



Abdomen cylindric. or very slightly tapering posteriorly, the lateral 

 margins becoming prominent and spinulose on the 8th and 9th seg- 

 ments. Gills long, widest near the apex and suddenly tapering to the 

 tips, spinulose margined, all slightly decurved, the middle one more 



