23G THE CANADIAN ENTOMOLOGIST. 



shaped galls resemble the galls of Amphibolips spongifica. Internally the 

 galls are composed of an exceedingly brittle, structureless material, of a 

 whitish or bufify-white colour that, to all appearances, shrinks away as the 

 gall dries, so that there are large open spaces internally. Near the point 

 of attachment on the inside of the gall is more or less of a resinous 

 substance. The portion containing the larval cells, which are few in 

 number, sometimes only one, is more dense, almost woody, in structure. 

 The substance of these galls cuts about like a perfectly dry cracker. 



This gall is separated readily from Mr. Bassett's A. califortiicus by 

 the much less dense internal structure, in which are large open spaces. 



Gall-flies. — The flies are of a very uniform walnut-brown colour 

 throughout. So far as I can see, this colour alone separates the species 

 from Bassett's calif 07-7iicus, which is very much lighter, a good cinnamon- 

 brown. (These colours are given in accordance with Ridgway's Nomen- 

 clature of colours.) Head : Face finely rugose, more coarsely so near the 

 mouth ; vertex, genas and occiput very finely rugose or granular in 

 a|)pearance, face rather closely set with very fine pubescence, occiput 

 black, antennae 15-jointed, 3rd joint i_^ times as long as the 4th, joints 

 beyond the 4tri gradually shorter, last 7 or 8 joints quite short and thicker 

 than the preceding. Thorax very finely rugose and covered with pilose 

 punctures, parapsidal grooves narrow and extending about half-way to the 

 collar, median groove wanting ; a slight groove on either side runs forward 

 over the base of the wings; the two parallel lines from the collar are very 

 distinct and extend fully half-way to the scutellum. Scutellum with two 

 small fovese fluted at the bottom, finely rugose, covered with a fine 

 pubescence ; pleurae finely punctured and hairy. Abdometi polished, 

 sides of 2nd segment near its base hairy, all the segments very minutely 

 punctured. Wmgs slightly smoky, venation normal. Feet unicolorous 

 with other parts, tarsal claws bidentate. 



Length, 5 mm. Wings, 6 mm. 



Described from 15 bred females. Galls were received August 26th, 

 and the flies emerged between the 3rd and 22nd of November. 



HoLCASPis, Mayr. 

 H. maculipennis, n. sp. 



The fragments of a globular leaf gall, about i^ cm. in diameter, com- 

 posed of a thin outer shell and a single larval cell held in place by 

 radiating fibres, was sent me some time since by Prof. T. D. A. Cockerell, 



