AQUATIC INSECTS IN THE ADIRONDACKS 549 



the base of each of the lateral filaments of the tenth abdominal segment 

 on its inner side. Other characters as given in the table for larvae 

 above. 



Chauliodes serricornis Say 



Saw-horned fish fly 



Plate 27 

 1821 Chauliodes serricornis Say, Acad. nat. sci. Phil. Jour. v. 2, appen- 

 dix p. 307 

 1839 Chauliodes serricornis Burmeister, Handb. ent. 2:949 

 1842 Neuromus maculatus Eambur, las. Neur. p. 442, pi. 10, fig. 2 

 1853 Neuromus maculatus Walker, Cat. Neur. ins. Brit. mus. 3 : 202 

 1861 Chauliodes maculatus Hagen, Synopsis Neur. N. Am. p. 190 

 1863 Chauliodes serricornis Walsh, (Corrects Hagen's names) Ent. 

 soc. Phil. Proe. 2 : 262 



1892 C hauliod 88 serricornis Banks, Am. ent. soc. 19 : 357 (listed) 



1893 Chauliodes serricornis Lintner, N. Y. state ent. 8th an. rep't, 



p. 157 (notes on its occurrence in New York state, with original figure ; 

 larva described and figured as Ch. pectinicornis?) 



This species was very common on Little Clear creek between the 

 hatchery and the railroad. Half a dozen specimens could be picked 

 from the sedges and flowering ferns in walking across this short open 

 space any day in July. When resting on the under side of the leaves of 

 the flowering fern, Osmunda regalis Linn,, they were not easily dis- 

 turbed ; several were carried into the hatchery on a fern spray. A pair 

 found in copulo was thus carried in and photographed (pi. 27); these 

 pictures show the singular position assumed by the male in copulation. 

 In this case, though not in any other of the many observed, the female 

 had apparently already deposited a large number of eggs. Shortly after 

 photographs a and b of the plate were taken the male departed, and the 

 female resumed ovipositing. She added eggs at first in regular series, 

 following the lines of the cluster already laid down; finally depositing a 

 partial second layer in less regular order on the top of the first. While 

 thus at work, the photograph reproduced as fig. c of the plate was taken. 



A large number of egg clusters were seen, all of them on the under 



side of leaves of the above mentioned fern. In the cluster shown in these 



figures there were about 900 eggs. Some larger clusters were seen ; many 



of them were smaller. These eggs hatched in 17 days. There appears to 



be great uniformity in -incubation period with eggs of the same cluster. 



Numerous clusters were picked with the eggs all hatching at once, heads 



protruding, and jaws widely swung open, a most curious sight, a veritable 



cheval de frise of great rapacious mandibles. 



The newly hatched larva of Ch. serricornis is 3 mm long, and 

 has much the same aspect as older larvae of the genus have. The head 



