IQ2 NEW YORK STATE MUSEUM 
Caenis diminuta. This little white dusk-flyer abounds in 
every submerged weed patch, its close clinging, flat-bodied, silt- 
covered nymphs adhering closely to the fallen stems among which 
they clamber. It has already been mentioned in the preceding pages — 
as Swarming into our trap lanterns, as being found in the hatchery 
windows after emergence from the ,fish troughs, and as constitut- 
ing a very considerable portion of the food of young sunfishes. It 
was abundant throughout July and August. 
Tricorythus allectus. Since I described this species from 
Itineves, in 1OOS IN, “, Sire Mis, Bull, So jp. 47] as Cacmis 
allecta, I have concluded that it should more properly be re- 
ferred to the genus Tricorythus.* Since that date I] have found it 
abundant in two new localities, at Watertown, Massachusetts, in 
the summer of 1906, where spiders’ webs on the bridges across the 
Charles river were draped with innumerable tangled specimens, 
and at Moose river, behind the hatchery at Old Forge. One of its 
favorite swarming places was the open area above the pole bridge 
shown in the middle of the photograph reproduced in plate 1. Here 
it swarmed at midday filling the air like snowflakes, with dragon 
flies, and robber flies lurking around the edges of the swarm, 
capturing as many specimens as they could eat. 
Choroterpes basalis. This pretty red brown species I ob- 
served several times in small companies swarming about the balsam 
firs on Wintergreen point in August. 
Habrophlebia vibrans n. sp. This delicate little reddish brown 
species I captured by hundreds near the outlet of Bald Mountain 
pond, where the brook crosses the road and begins its descent 
among the fern clad boulders. White winged companies of them 
were dancing up and down under the birch canopies, the lowest of 
them within reach of my net. I have been unable to determine from 
Bank’s description and figure of H. americana [Ent. News. 
TOOR, TL 225 I, what relation this species may bear to that one from 
New Jersey. The nymph of that one as described by Berry (Amer. 
Nat. 37:27-29, 1903) does not belong to this genus at all: it is a 
typical Leptophlebia. I present herewith a figure of the 
venation [pl. 10, fig. 1] and of the appendages of the male, and 
add the following further characterization of the male imago, the 
only form found: 
1 See also Cockerell & Gill: Tricorythus, a genus of Mayties. Univ. of 
Col. Studies 3:135-37. A paper that has appeared since the above was 
written. 
