AQUATIC INSECTS IN THE ADIRONDACKS 465 



1892 Aeschua vinosa Banks, Am. ent. soc. Trans. 19 : 353 (listed from New 



York) 



1893 Fon s col o m bia vinosa Calvert, Am. eut, soc. Trans. 20:247 (de- 



scription) 

 1895-97 Fonscolombia vinosa Calvert, N. Y. eut. soc. Jonr. 3 : 45 and 5 : 93 

 (listed from Keeseville, Ithaca, Schoharie, Piseco lake, Elk lake, Colden, 

 and Westchester co.) 



1899 Fon scolombia vinosa Kellieott, Odon. Ohio, p. 90 (description) 



1900 Boyeria vinosa Williamson, Dragon flies Ind. p. .300-1 (description) 

 1881 Neuraescbna vinosa Cabot, (Nymph) Mus. compar. zool. Mem. 



8 : 29, 39, pi. 2, fig. 3 



This interesting species, which seems likely to be found inhabiting 

 almost every woodland creek in the state, was very common at Saranac 

 Inn in Little Clear creek, and in the borders of the pond above. The 

 nymphs were transforming commonly on the sides of timbers in the edge 

 of the water from the beginning of our session till the latter end of July. 

 A number of both sexes were reared in our cages. A few imagos might 

 be seen, specially afternoons in favorable weather from midsummer till 

 the end of our session, about the creek on the hatchery grounds. They 

 glide along above the stream, not veiy rapidly, on well poised, transpar- 

 ent wings, which against the background of the water are well nigh in- 

 visible. The two big round yellow spots on each side of the thorax dis- 

 tinguish this species from all its kin, even while in flight. 



The nymphs, which are generally quite dark colored, seem to prefer 

 timbers, trailing roots, driftwood, etc., as a foraging ground. I have 

 rarely taken them from green vegetation. 



Nymph. Total length ^ 33, $36 mm; abdomen, $ 22.5, $25mm; 

 hind femur 5.5 mm; width of head 7 mm, of abdomen 7.5 mm. 



Body elongate, slender, smooth; color blackish brown, obscurely 

 marked with paler in transverse rings on the legs, and in dashes, tending 

 to become arranged in interrupted, longitudinal rows on the abdomen. 



Head concave behind, with truncated hind angles; sides straight, 

 diverging strongly anteriorly to meet the very prominent eyes ; labium 

 moderate; middle third of front margin of median lobe straight, with a 

 tooth at each side remote from the median cleft. 



Abdomen widest across the fifth and sixth segments, tapering unequally 

 to the ends ; no dorsal hooks ; lateral spines on segments 5-9, on 5 

 small, on 6-9 conspicuous, increasing a Httle in size posteriorly, those of 

 the ninth segment three fourths as long as the loth segment; the ab- 

 dominal segments are longest in the middle, and decrease a little toward 

 both ends ; the appendages are longer than the last two segments 

 together, and differ in the two sexes in the form of the apex of the super- 

 ior appendage; in the $, this has a distinct narrow apical cleft, in the $ 

 the cleft is closed when grown ; in small female nymphs, however, I have 

 seen it quite as widely open and as distinct as in the male : in both sexes 



