19-^2.] 105 



when fully formed, iiud often crowded closely together. Each swelling- 

 contains a single larva, which when full-grown pupates within the 

 swelling ; before emergence the pupa pushes itself half-way out through 

 the side of the swelling, and when this has taken place the whole cap of 

 the blister easilj^ becomes detached, leaving a shallow depression on the 

 surface of the fungus. So far as I am aware this is the first record of a 

 Cecidomyiid fly producing a more or less definite gall on a fungus, and 

 for that reason I have thought it worth while to waite an account of the 

 species. 



From the material collected by Mr. Eamsbottom I was fortunate 

 enough to rear 3 (5" d and 3 $ § . An examination of these specimens 

 shows that they belong to the tribe Cecidomyiariae, and by the table of 

 genera in Kieffer's monograph in Wytsman's " Genera Insectorum " 

 appear to run down to either Frauenfeldiella or Galodiplosis, according 

 as the palpi are taken as two or three-segmented. From these, however, 

 they differ in many respects, and as I have been unable to trace any 

 subsequently described genus into which they will lit, I feel compelled 

 reluctantly to propose a new generic name, overburdened as the family 

 already is with such names. 



Mycocecis, gen. n. 



J $. Eyes toLichiiig. Palpi 2-segiiiented (apart from the palpiger), very 

 short, and the segments iudistinctlj^ separated. Antennal flagellum l:2-seg- 

 meuted, the tirsttwo segments connate; each with two liair-wLorls and three 

 rings of looped filaments, eight equal-sized loops in each ring; teiminal seg- 

 ment with a small, conical, connate, pubescent knob. First scapal segment 

 simple, rounded. Mesouotum without scales. Abdomen rather densely but 

 shortly hairy ; short and broad. Legs densely covered with close-lying hair- 

 like scales or flattened, blunt-tipped hairs, sometimes showing a single median 

 striatiou. Claws each with a long sharp tooth arising near the base. Empo- 

 dium and pulvilli rudimentary, less than half as long as the claws. Wings 

 densely covered with close-lying hairs ; costa without scales. Sc absent, or 

 only faintly traceable at the base. R\ well separated from the costa, ending 

 about the middle of the wing> Rs slightly curved downwards, ending very 

 slightly before the middle of the wing-tip ; r-cu almost in a line with Rs, 

 much longer and stronger than the basal section of Rs. Cu forking a short 

 distance before the tip of i?i. 



(S • Flagellar segments each with two conspicuous swellings, the basal one 

 almost sessile and about tAvo-thirds as long as the apical one, this latter with a 

 terminal neck which is about half its breadth and nearly two-thirds its length. 

 Loops nearly as long as the greatest diameter of the segments. Ilypopygium : 

 both dorsal and ventral anal lamellae (tenth teigite and sternite) with a rather 

 deep and rounded emargination. Aedeagus (stylet) rather stout but slightly 

 chitinised. .Side-pieces rather over twice as long as broad, without lobes. 

 Claspers rather short and stout, tapering, with a single short terminal claw. 



