AQUATIC INSECTS I.\ NEW YORK STATE 217 



the rear between the wings; brown spots on the base and in the 

 furrows of the wings. Legs pale, smooth, somewhat infuscated 

 on the tarsi. 



Abdomen with a median dorsal interrupted band of brown, 

 preceded by an urceolate divided brown mark on the metatho- 

 racic dorsum, furcate anteriorly on segment 1 of abdomen, 

 broadly overspreading segments 2 and 3 with additional brown 

 spots at the sides and divided by paler apically; reduced to a 

 slender T-mark on i, the T-mark and lateral spots reappearing 

 on 5, the T-mark joined to an apical transverse line on 6, and on 

 7, fused with the lateral spots, a median line with lateral 

 ()-marks on S and 9, 10 with the line and the margins narrowly 

 (the apical margin more broadly) fuscous. 



Gills on segments 1-7, on 7 simple, and almost symmetric, a 

 slightly Indicated basal lobe on the posterior side, on 6, 5, 4 and 

 3 this basal lobe is successively more pronounced, becoming 

 separated by a deep notch on 3; on 2 and 1 this lobe becomes a 

 third as large as the body of the gill under which it is then 

 folded, and a shallow incision appears on the anterior side of 

 the body of the gill, nearer apex than base. All gills erect, with 

 tracheae pinnately branched. The setae are pale with a wash 

 of darker color near the tip. 



Other items in the food 



The eight water mites, At ax crassipes Miill., found in 

 the food may well have been taken accidentally, as they are so 

 small they could scarcely have been taken otherwise. 



The large number of Daphnidae found in a single stomach is a 

 peculiarity for which I have no explanation to suggest. They 

 were in an advanced state of digestion, and the number given 

 is only approximate. There were fragments of what I took to 

 be Daphniae in the stomach of trout 5 also, but scarcely recog- 

 nizable. The difSculty of recognizing and counting these was 

 quite in contrast to the ease and certainty with which the same 

 things were done for the other food constituents. The heads 

 of Chironomus and Oorethra were most distinctive, and were 

 the parts longest resisting digestion, so that among a mass of 

 fragments it was only necessary to count the heads. 



The items listed as miscellanies were doubtless all accidental 

 and unimportant. I think that the trout scales found did not 

 indicate that any trout had been eaten, but only that they had 

 been fighting, and this one had bitten another deeply enough to 

 loosen a bit of its cuticle. 



