NATURAL HISTORY SOCIETY OF GLASGO^V. 179 



Cecidomyia pilosellae, sp, n. 



Male : yellow, with a slightly ochreous tinge, paler beneath ; 

 pubescence pale. Vertex and upper portion of hind-head fuscous ; 

 eyes black ; antennae 12-jointed, two basal joints swollen and pale 

 yellow, the rest dusky yellow, joints sessile. Thorax with three 

 short brown dorsal stripes ; halteres uniform yellow. Abdomen 

 with large anal forceps, the size of the head, oval in shape, with a 

 prominent projecting tooth on lower margin. Legs pale whitish 

 yellow, shining white beneath. Wings flavescent, root yellow, 

 somewhat iridescent ; costal and first longitudinal nervures pale 

 yellowish brown, second nervure darker and more fuscous, third 

 very pale ; second longitudinal nervure joins margin befo7'e apex. 



Length, a little over half a line. 



After death the yellow assumes a deeper ochreous tinge. 



This species is abundantly distinct from the C. hieracii of Fr. 

 Loew (Verb. d. k. k., zool.-bot. Gesell. in Wien, 1874, pp. 145 

 and 321). 



The larva is scarcely 1 J line long, yellow or orange yellow, and 

 minutely tubercled. It enters the earth to undergo its transfor- 

 mations, spinning a white cocoon. The pupa-case, after the 

 perfect insect has emerged, is white. 



It affects the leaves of Hieracium pilosella, Lin., the margin of 

 the leaf being involutely rolled, and on its inner face the ordinary 

 long hairs are generally modified into a more or less dense pale 

 white pubescence, about one-sixteenth of an inch long. 



From leaves collected in Kilsyth Glen on the 6th August, I 

 reared a single male on the 29th of the following month : the 

 above description is taken from it. I have also gathered leaves 

 inhabited by larvae, near Milngavie, towards the end of 

 September. 



Cecidomyia quercus, sp. n. 



Female : head blackish fuscous ; epistoma and palpi dusky 

 reddish orange ; eyes black, margin behind shining white, with a 

 fringe of long hairs ; there is a tuft of long, pale or white hairs 

 over the mouth, and the palpi are pale-haired ; the third joint of 

 palpus is twice as long as the second, and the last is equal to the 

 two preceding taken together; antennae very short, only one- 

 fourth the length of body, 12-jointed, fuscous, except the two 

 basal joints, which are dusky yellow, joints sessile, cylindric, as 



