SERICOSTOMIDyE. — EKACHYCENTRUS. 181 



and are remarkable for the disparity that exists in the palpi of the 

 sexes, the labial ones in the males being more or less clavate, and in 

 the females having their terminal joint small ; the wings are almost 

 destitute of transverse nervures, and are usually rather thick, are of 

 plain colours, rarely adorned with spots. The indigenous species 

 may be thus divided into genera : — 



TiJm aw^im haud calcaratis : . . . .18. Potomaria. 



bicalcaratis ; 

 iniermediis bicalcaratis: .... 19. Sericostoma. 

 quadricalcaratis ; 

 Antennis lemotis ; calcaribus hievihus I . . 17. Brachycentrus. 



approquintantibus ; 



art", basali vix elongate : . . 20. Notidobia, 



elongate ; 



hirsutissimo : , 23, Mormonia. 



vix hirsute ; 

 (Palpis maxillaribus mans) divancaXis : . 21. Silo. 



recurvis. . . 22. Goer a. 



Genus XVII.— BRACHYCENTRUS, Curtis. 



AntermcB remote at their origin, shorter than the wings, stout in the males, 

 rather slender in the females, the basal joint slightly robust: maxillary 

 palpi in the males short, diverging and very pilose, in the females long and 

 slender : head rather small, transverse, pilose : eyes globose, lateral : thorax 

 short, hairy: wings ample, broadest towards the apex, which is obtusely 

 rounded ; anterior with a small triangular areolet on the disc between tlie 

 stigma and the inner margin, from which arise four somewhat parallel 

 nervures, which extend to the hinder margin, the following nervure is trifid, 

 each branch becoming furcate on the margin, the second costal nervure is 

 abruptly angulated before the stigma; posterior wings smaller, ovate, with 

 the costal nervures bifid at the apex, the inner one simple : legs rather 

 short : tihice with a pair of short spurs at the apex, the intermediate and 

 hinder pair with a second pair below the middle. 



These insects are remaikable for having the spurs of the tibise 

 very short ;'*the antennae, which are of dissimilar degrees of robust- 

 ness in the sexes, are placed somewhat remotely from each other ; 

 the palpi are short, diverging and very pilose in the males, but 

 slender and longer in the females ; the wings are less opaque than 

 in the other genera of this family, and have the nervures distinct, 

 with a conspicuous elongate-triangular areolet on the upper pair 

 towards the apex of the disc. 



