Euura cosensii

Euura orbitalis

Euura salicisovulum

Euura serissimae

Euura crassicornis

Euura salicisdesmodioides

Euura proxima

Euura lucidae

Euura salicispisum

Euura salicispomum

Euura cosensii n. sp.

The sawfly gall on the base of the petiole of Salix humilis Marsh, is common in High Park of this city. and last fall it was particularly plentiful. Induced by this fact to forget several unsuccessful attempts to rear the producer, I collected a large number of the galls and kept them during the winter under as nearly natural conditions as possible. A number pupated a couple of inches below the surface of the soil in the breeding jar, and several adults emerged between June 3rd and 10th, S. A. Rohwer, Washington, D.C., to whom specimens were sent, has not yet published his description, but has sent me a manuscript copy of it. The species which has been named Euura cosensi n. sp., is said to be closely connected with Euura nodus Walsh, a form that produces stem galls on Salix longifolia Muhl. From this species it may readily be differentiated by the shape of the sheath and the different sculpture of the head.

Euura gemma 

Host: Salix humilis

In this species, the gall is formed by the abnormal swelling of a lateral bud.

Range: Toronto Ontario

Euura ovum

Host: Salix humilis

An elongated oval swelling on one side of a twig constitutes the gall in this case. 

Range: Toronto, Ontario

Euura serissimae

Host: Salix serissima



Pontania crassicornis Rohwer

Host Salix humilis

The gall resembles the well known Pontania pomum, Walsh, in shape, but is considerably smaller. It is densely pubescent and several are usually crowded together on one leaf. 

Range: Toronto, Ontario

Pontania desmodioides

Host Salix humilis

A smooth, flattish gall with a semicircular outline originating from the mesophyll of the leaf of the host. The last two galls mentioned are abundant in this locality. Especially in the western part of the city the numerous ridges and plains consist largely of sand sorted over and deposited by the wave action of the glacial. Lake Iroquois. In the light soil thus produced pines and oaks flourish and in the open spaces among these Salix humilis finds an ideal habitat. The resulting frequent occurrence of this food plant contributes to the abundance of several of our sawfly galls parasitic on this host.

Range: Toronto, Ontario

Pontania hyalina

Host: Salix alba

The galls are arranged in two almost parallel rows, one on each side of the midrib of the leaf. This is the most plentiful willow gall in this vicinity. The host has been planted in large numbers and few of these escape infection.

Range: Toronto, Ontario

Pontania lucidae

Host: Salix lucida

The gall is produced as an enlargement of the petiole or midrib of the leaf. Throughout the district in general this species is not common. 

Range: Toronto, Ontario

Pontania pisum

Host: Salix discolor

An almost spherical pea-like gall, with a small point of attachment to the leaf of the host. Only rarely found in the locality. 

Range: Toronto, Ontario

Pontania pomum

Host: Salix cordata [eriocephala]

 Among the numerous sand ridges, referred to previously, are many streams and ponds of water. These are skirted, often for long stretches, by a screen of the heart-leaved willow. The majority of these host plants are always infested with this gall.

Range: Toronto, Ontario

Reports on insects of the year, Division No. 3, Toronto District. Forty-Fifth Annual Report of the Entomological Society of Ontario, 1914