274 THE DRY-FLY MAN'S HANDBOOK 



SERICOSTOMATID^ 

 The spur formula for both sexes of Sericostoma and 

 Notidobia is 2, 2, 4. 



Sericostoma personatum is the Welshman's button of 



the Hampshire fisherman. The 



Sericostoma difference between the sexes 



personatum. is marked not only in the size 



but in the great disparity be- 

 tween the maxillary palpi. In the male the palpi at 

 the first glance are not always easily distinguished be- 



Fin. 54. Welshman's button Caddis x 4 



cause they are turned back, masking the face. They 

 are covered with silky hairs, hence the name Sericos- 

 toma (crriptKo^, silky; a-TOfia, mouth). The palpi of the 

 female are very long, strong and hairy, the basal 

 joint short, second longer and stouter than any 

 succeeding, third, fourth and fifth thinner and sub- 

 equal. I have given at Fig. 54 a drawing of the 

 case of the larva, and at Plate XXV HI a male 

 imago in profile. Plate XXIX shows the female 

 imago. 



Notidobia ciliaris, of which a male is shown in 

 Fig. 50, although similar in many respects to the 



