AQUATIC INSBOTS IN NEW YORK STATE 263 



I bred the species at Galesburg 111. in June 1896, and Prof. 

 O. F. Baker bred it at Auburn Ala. May 15, 1897, and eent me a 

 male imago with its cast skin. 



Nymph. Measures in length 8mm, gills barely 4mm additional : 

 width of head 2.3mm. 



Color greenish or blackish brown, paler on the legs, on the 

 distal two thirds of the antennae, and on the sutures. Clearly 

 marked specimens show on the pale upper surface of the head 

 a narrow line of brown each side extending from the eye almost 

 to the median line parallel to the hind margin; in front of which 

 a broader and less well defined band extends between the eyes on 

 top of the head. From the head there extends posteriorly to 

 the end of the abdomen a dorsal, indistinct median band, divided 

 by a very narrow median line. There are interrupted lines of 

 black on the carinae of the femora and tibiae, very narrow. 

 Gills ,[pl.l5, e] pale with interrupted pigmentation, tending to 

 form diffuse blotches, the most prominent of which is just before 

 the middle of the gill. 



Body slender. Head compact, with eyes prominent, obtusely 

 rounded, scurfy, hairy hind angles, and deeply and roundly ex- 

 cavate on hind margin. Legs slender. Wings reaching the base 

 of the fourth abdominal segment. Abdomen a little longer than 

 the gills. Gills lanceolate, long pointed, nearly bilaterally 

 symmetric, widest just beyond the middle. 



Antennae seven jointed, the relative length of the joints being 

 as follows in order from the base: 1:1.3:2:1.3:1.5:1.4:1.2:1. 

 Labium of moderate length, mentum not strongly contracted at 

 base, median lobe prominent, fringed with microscopic scales so 

 arranged as to give a serrate edge, mental setae four and often 

 a small rudiment of a fifth, lateral setae [pl.l4, ;] five, movable 

 hook short, arcuate, end hook blunt, and above it on the end 

 of the lateral lobe, three well defined teeth, and above them a 

 denticulate angular prominence. 



APPENDIX ON ODONATA 



During the past season there has been opportunity for maldng 

 some further observations on the Odonata-Anisoptera; and in 

 the lapse of time since Bulletin 47 was issued collections have 

 been received from a number of friends, and among the speci 

 mens received are a number of nymphs of species belonging to 

 the New York fauna. It is now possible to add descriptions of 

 the nymphs of 11 additional species, with new data on some 



