OF EXTRA-EUROPEAN TRICHOPTERA, 115 



ovate, truncate, and dilated, slightly scaly, armed with one stout, 

 claw-shaped spur ; first joint of tarsi enormously dilated, twice the 

 length of the tibia, sulcate internally, the lower surface densely fur- 

 nished with waxy-looking scales ; succeeding tarsal joints short and 

 small, gradually diminishing in length and thickness; intermediate 

 and posterior legs slender, and of the ordinary form, each tibia 

 furnished with an apical and subapical pair of long and equal 

 spurs. Abdomen short and somewhat stout; inferior appendices 

 short, curved. 

 Anterior wings oval, rather densely clothed with short hairs, the fringes 

 somewhat long ; subcosta and radius nearly straight, parallel ; dis- 

 coidal cell narrow, closed by a straight veinlet ; cellula thyridii very 

 long, extending nearly to the base, and reaching to the middle of the 

 discoidal cell, closed by a straight veinlet ; a veinlet unites the lower 

 fork of the ramus discoidalis with the ramus thyrifer, placed level 

 with that closing the discoidal cell ; an oblique veinlet beneath the 

 middle of the cellula thyridii unites this .with the cubitus anticus; 

 seven apical cellules, the first extending along one-third of the upper 

 edge of the discoidal cell, third shorter than the first, but longer than 

 the second, fourth equal to the second, fifth longer than the first, 

 extending to a level with the middle of the discoidal cell. Posterior 

 wings moderately long, gradually dilated to beyond the middle, apex 

 parabolic, costal margin with a short inturned fringe, anal portion 

 with very long fringes; subcosta and radius united for some dis- 

 tance, afterwards separating and diverging ; discoidal cell small, sub- 

 triangular, closed by a straight veinlet ; a second veinlet unites the 

 lower edge of the discoidal cell to the ramus subdiscoidalis ; lower 

 branch of the ramus discoidalis simple ; ramus subdiscoidalis simply 

 and longly furcate. 



A genus abundantly distinct by the enormous labial palpi, 

 and very abnormal structure of the anterior legs, the aborted 

 tibia and enormous first tarsal joint in these legs being very re- 

 marliable ; the mass of scales on the surface of this strange tarsal 

 joint has, at first sight, the appearance of a waxy secretion, but 

 resolves itself into waxy-looking scales under a high power. The 

 genus is evidently a near ally of Mbrmonia ; and nature would 

 seem to have selected this group as one in which she can best 

 display her wealth of forms. In this group is also exhibited a 

 more or less constant tendency to substitute a scale-like clothing 

 for hairs in the male sex. In the typical species of Mbrmonia 

 (M. hirta) this clothing pervades almost the entire insect ; in 

 Nosopus it is concentrated, so to speak, upon the labial palpi 

 and the abnormal tarsal joint. It is possible, nay, almost certain. 



