22 TINEID.E. 



apex incrassatus, siibdoi-salis louge furcata ; posteriores : vense apicalis 



furcata3 ramus inferior in apicem exit, infra earn vena} ducE e venula 



transversa; raediana bifida. 



Head ahoiie very lialry, in front more clothed with scales. Ocelli dis- 

 tinct behind the eyes. Antenna rather thick, about half the length of 

 the anterior wings, sometimes thiclamed tcitlb scales to the middle. ]\Iax- 

 illary palpi undeveloped. Labial palpi porrected, the second joint very 

 hairy, and with a prolonged tuft, the third joint smooth, ascending, 

 pointed. Tongue short, not clothed with scales. Winys with mode- 

 rate cilia, the anterior oblong, 7oith semi-erect scales {having a ruyged 

 ajyjjearance), the posterior oblong- ovate. In the anterior wings the 

 apical vein is furcate, terminating in the costa before the apex, beneath 

 it are four veins ; the apex of the subraedian vein is thickened, and the 

 subdorsal vein is for a consideralile length furcate ; in the posterior 

 wings the lower branch of the forked apical vein terminates in the apex, 

 below it two veins run from the transverse vein, and the median vein is 

 bifid. 



The perfect insects of tliis geuns are found among grass, but, 

 except during the very middle of the day, from 12 to 2 p.m., are 

 rarely met with ; at that hour they are very active, hopping about 

 on the stems of the grass, and taking short flights, but tlieir pe- 

 riod of flight once over, they conceal themselves so well that it is 

 almost impossible to detect them. The larva of one species (0. 

 BirdeUa) I have occasionally met with, when full fed, crawhng on 

 grass ; but it feeds inside the stems, and in one instance had bored 

 // down the stem of Dacti/JJs ylomeratus almost to the root, and was 

 / oifly detected by the fact of an Elacli'ista. having taken a fancy to 



£_ / the same plant of Dactijhj>^, which led Mr. Wing to the discovery 

 ' of the concealed Ocksenhelnieria. IMr. Scott also found these 

 larva? in the stems of grass. 



We liave only three British species in this genus (two others 

 ai'e known on the continent) ; they may be readily distinguished 

 by the antennrc. 



a. Antenna; much thickened with scales to the middle. Species 1. 

 a a. Antennfc very slightly thickened with scales nearly to the middle. 



.Species 2. 

 a a a. Antenuie perfectly simph;. Species 3. 



-f . 1. Birdella, Curt. B. E. fo. 344 (1831); Step.; Sin.— Bison tella, 



Sta. — Mediojjctlinella, Haw.? Step.? Alls nnticis griseo-fuscis vel 

 obscure ochreis, scpiamis numcrosis exaspcratis fuscis, albidisvc; alis 

 posticis pur])ureo-fuscis, ijjsa hasi hyalina. Capillis griseo-fuscis. An- 

 (^'^ •I'iP' tennis nsque rnediiim valde incrassatis squamis crcctis projicientibus. 

 ^^ ^^/^ Exp. aL.5.V-r,i liu. 



Hairs of the head and face greyish-fuscous. Antenn.'o at the base 



